Javascript how to validate dates in format MM-DD-YYYY

Question

I saw a potential answer here but that was for YYYY-MM-DD  JavaScript date validation  I modified the code code above for MM-DD-YYYY like so but I still can t get it to work   String prototype isValidDate   function           var IsoDateRe   new RegExp     0-9  2  -  0-9  2  -  0-9  4            var matches   IsoDateRe exec this        if   matches  return false       var composedDate   new Date matches 3    matches 1  - 1   matches 2         return   composedDate getMonth       matches 1  - 1    amp  amp         composedDate getDate      matches 2    amp  amp         composedDate getFullYear      matches 3         How can I get the above code to work for MM-DD-YYYY and better yet MM DD YYYY   Thanks

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How about validating dates in  ANY  date format   I ve been using the DateJS library and adding it to existing forms to ensure that I get valid dates  amp  times formatted the way that I want   The user can even enter things like  now  and  tomorrow  and it will be converted into a valid date   Here s the dateJS library  http   www datejs com   and here s a jQuery tip that I wrote  http   www ssmedia com utilities jquery index cfm datejs htm

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what isn t working about it  here s a tested version  String prototype isValidDate   function            const match   this match     0-9  2      0-9  2      0-9  4           if   match    match length     4            return false            const test   new Date match 3   match 1  - 1  match 2         return            test getMonth      match 1  - 1   amp  amp           test getDate      match 2    amp  amp           test getFullYear      match 3             var date    12 08 1984      Date   is  Sat Dec 08 1984 00 00 00 GMT-0800  PST   alert date isValidDate         true

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Simple way to solve  var day   document getElementById  DayTextBox   value   var regExp       1-9   1  012     -  1-9   1  0-9   2  0-9   3  01     -  1  6-9  0-9  0-9   2  0  01  0-9       return regExp test day

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try this   function validateDate dates       re       d 1 2      d 1 2      d 4               var days new Array 31 28 31 30 31 30 31 31 30 31 30 31                if regs   dates match re                            day value between 1 and 31                     if regs 1   lt  1    regs 1   gt  31                                              return false                                               month value between 1 and 12                     if regs 2   lt  1    regs 2   gt  12                                                   return false                                             var maxday days regs 2 -1                        if regs 2   2                           if regs 3  4  0                               maxday maxday 1                                                                                                       if regs 1  gt maxday                           return false                                             return true                 else                    return false

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Expanding on  quot Short and Fast quot  above by  Adam Leggett  as cases like  quot 02 30 2020 quot  return true when it should be false  I really dig the bitmap though    For a  MM DD YYYY date format validation  const dateValid    date    gt      const isLeapYear    yearNum    gt        return   yearNum   100     0     yearNum   400     0     yearNum   4     0          1        0        const match   date match     d d     d d     d 4               const month    match 1    0  - 1    const day   match 2    0    const year   match 3    0   const dateEval    month  lt  0                           Before January       month  gt  11                          After December       day  lt  1                           Before the 1st of the month       day - 30  gt   2773  gt  gt  month  amp  1           month     1  amp  amp  day - 28  gt  isLeapYear year            Day is 28 or 29  month is 02  year is leap year    gt  true           return   nDate    date  n n        Valid Date     dateEval  n                                               console log dateValid  02 28 2020       true console log dateValid  02 29 2020       true console log dateValid  02 30 2020       false console log dateValid  01 31 2020       true console log dateValid  01 31 2000       true console log dateValid  04 31 2020       false console log dateValid  04 31 2000       false console log dateValid  04 30 2020       true console log dateValid  01 32 2020       false console log dateValid  02 28 2021       true console log dateValid  02 29 2021       false console log dateValid  02 30 2021       false console log dateValid  02 28 2000       true console log dateValid  02 29 2000       true console log dateValid  02 30 2000       false console log dateValid  02 28 2001       true console log dateValid  02 29 2001       false console log dateValid  02 30 2001       false  For a  MM-DD-YYYY date format validation  Replace    in the pattern for match by -

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This function will validate the date to see if it s correct or if it s in the proper format of  DD MM YYYY   function isValidDate date        var matches       d 2   -     d 2   -     d 4     exec date       if  matches    null  return false      var d   matches 1       var m   matches 2 -1      var y   matches 3       var composedDate   new Date y  m  d       return composedDate getDate      d  amp  amp             composedDate getMonth      m  amp  amp             composedDate getFullYear      y    console log isValidDate  10-12-1961     console log isValidDate  12 11 1961     console log isValidDate  02-11-1961     console log isValidDate  12 01 1961     console log isValidDate  13-11-1961     console log isValidDate  11-31-1961     console log isValidDate  11-31-1061

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function isValidDate date            var valid   true           date   date replace   - g                 var month   parseInt date substring 0  2  10           var day     parseInt date substring 2  4  10           var year    parseInt date substring 4  8  10            if isNaN month     isNaN day     isNaN year   return false           if  month  lt  1      month  gt  12   valid   false          else if  day  lt  1      day  gt  31   valid   false          else if   month    4      month    6      month    9      month    11    amp  amp   day  gt  30   valid   false          else if  month    2   amp  amp     year   400     0       year   4     0    amp  amp    year   100     0   amp  amp   day  gt  29   valid   false          else if  month    2   amp  amp    year   100     0   amp  amp   day  gt  29   valid   false          else if  month    2   amp  amp   day  gt  28   valid   false       return valid      This checks for valid days in each month and for valid leap year days

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if  document getElementById  expiryDay   value    test match      0-9  2      0-9  2               alert  Enter the date in two digit month flowed by two digits year  n

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function isValidDate date        var matches       d 1 2   -     d 1 2   -     d 4     exec date       if  matches    null  return false      var d   matches 2       var m   matches 1  - 1      var y   matches 3       var composedDate   new Date y  m  d       return composedDate getDate      d  amp  amp              composedDate getMonth      m  amp  amp              composedDate getFullYear      y    console log isValidDate  10-12-1961     console log isValidDate  12 11 1961     console log isValidDate  02-11-1961     console log isValidDate  12 01 1961     console log isValidDate  13-11-1961     console log isValidDate  11-31-1961     console log isValidDate  11-31-1061       It works   Tested with Firebug  hence the console log

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You can simplify it somewhat by changing the first two lines of the function to this   var matches   this match     0-9  2      0-9  2      0-9  4         Or  just change the parameter to the RegExp constructor to be      0-9  2      0-9  2      0-9  4

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Please find in the below code which enables to perform the date validation for any of the supplied format or based on user locale to validate start from and end to dates  There could be some better approaches but have come up with this  Have tested it for the formats like  MM dd yyyy  dd MM yyyy  yyyy-MM-dd  yyyy MM dd  yyyy MM dd and dd-MM-yyyy    Note supplied date format and date string go hand in hand    lt script type  text javascript  gt  function validate format         if isAfterCurrentDate document getElementById  start   value  format             alert  Date is after the current date           else           alert  Date is not after the current date               if isBeforeCurrentDate document getElementById  start   value  format             alert  Date is before current date           else           alert  Date is not before current date               if isCurrentDate document getElementById  start   value  format             alert  Date is current date           else           alert  Date is not a current date               if  isBefore document getElementById  start   value  document getElementById  end   value  format             alert  Start Effective Date cannot be greater than End Expiration Date          else           alert  Valid dates                 if  isAfter document getElementById  start   value  document getElementById  end   value  format             alert  End Expiration Date cannot be less than Start Effective Date          else           alert  Valid dates                 if  isEquals document getElementById  start   value  document getElementById  end   value  format             alert  Dates are equals             else           alert  Dates are not equals                 if  isDate document getElementById  start   value  format             alert  Is valid date             else           alert  Is invalid date                       This method gets the year index from the supplied format     function getYearIndex format         var tokens   splitDateFormat format        if  tokens 0       YYYY                 tokens 0       yyyy             return 0        else if  tokens 1      YYYY                 tokens 1       yyyy             return 1        else if  tokens 2       YYYY                 tokens 2       yyyy             return 2               Returning the default value as -1     return -1            This method returns the year string located at the supplied index     function getYear date  index         var tokens   splitDateFormat date       return tokens index             This method gets the month index from the supplied format     function getMonthIndex format         var tokens   splitDateFormat format        if  tokens 0       MM                 tokens 0       mm             return 0        else if  tokens 1       MM                 tokens 1       mm             return 1        else if  tokens 2       MM                 tokens 2       mm             return 2               Returning the default value as -1     return -1            This method returns the month string located at the supplied index     function getMonth date  index         var tokens   splitDateFormat date       return tokens index             This method gets the date index from the supplied format     function getDateIndex format         var tokens   splitDateFormat format        if  tokens 0       DD                 tokens 0       dd             return 0        else if  tokens 1       DD                 tokens 1       dd             return 1        else if  tokens 2       DD                 tokens 2       dd             return 2               Returning the default value as -1     return -1            This method returns the date string located at the supplied index     function getDate date  index         var tokens   splitDateFormat date       return tokens index             This method returns true if date1 is before date2 else return false     function isBefore date1  date2  format           Validating if date1 date is greater than the date2 date     if  new Date getYear date1  getYearIndex format                 getMonth date1  getMonthIndex format   - 1               getDate date1  getDateIndex format    getTime            gt  new Date getYear date2  getYearIndex format                 getMonth date2  getMonthIndex format   - 1               getDate date2  getDateIndex format    getTime              return true             return false                            This method returns true if date1 is after date2 else return false     function isAfter date1  date2  format           Validating if date2 date is less than the date1 date     if  new Date getYear date2  getYearIndex format                 getMonth date2  getMonthIndex format   - 1               getDate date2  getDateIndex format    getTime            lt  new Date getYear date1  getYearIndex format                 getMonth date1  getMonthIndex format   - 1               getDate date1  getDateIndex format    getTime                       return true             return false                            This method returns true if date1 is equals to date2 else return false     function isEquals date1  date2  format           Validating if date1 date is equals to the date2 date     if  new Date getYear date1  getYearIndex format                 getMonth date1  getMonthIndex format   - 1               getDate date1  getDateIndex format    getTime               new Date getYear date2  getYearIndex format                 getMonth date2  getMonthIndex format   - 1               getDate date2  getDateIndex format    getTime              return true             return false            This method validates and returns true if the supplied date is     equals to the current date      function isCurrentDate date  format           Validating if the supplied date is the current date     if  new Date getYear date  getYearIndex format                 getMonth date  getMonthIndex format   - 1               getDate date  getDateIndex format    getTime               new Date new Date   getFullYear                     new Date   getMonth                     new Date   getDate    getTime              return true             return false                            This method validates and returns true if the supplied date value     is before the current date      function isBeforeCurrentDate date  format           Validating if the supplied date is before the current date     if  new Date getYear date  getYearIndex format                 getMonth date  getMonthIndex format   - 1               getDate date  getDateIndex format    getTime            lt  new Date new Date   getFullYear                     new Date   getMonth                     new Date   getDate    getTime              return true             return false                            This method validates and returns true if the supplied date value     is after the current date      function isAfterCurrentDate date  format           Validating if the supplied date is before the current date     if  new Date getYear date  getYearIndex format                 getMonth date  getMonthIndex format   - 1               getDate date  getDateIndex format    getTime            gt  new Date new Date   getFullYear                    new Date   getMonth                     new Date   getDate    getTime              return true             return false                            This method splits the supplied date OR format based     on non alpha numeric characters in the supplied string      function splitDateFormat dateFormat           Spliting the supplied string based on non characters     return dateFormat split   W             This method validates if the supplied value is a valid date      function isDate date  format                           Validating if the supplied date string is valid and not a NaN  Not a Number      if   isNaN new Date getYear date  getYearIndex format                 getMonth date  getMonthIndex format   - 1               getDate date  getDateIndex format                                    return true             return false                                                 Below is the HTML snippet        lt input type  text  name  start  id  start  size  10  value  05 31 2016    gt   lt br  gt    lt input type  text  name  end  id  end  size  10  value  04 28 2016    gt   lt br  gt   lt input type  button  value  Submit  onclick  javascript validate  MM dd yyyy       gt

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I use this regex for validating MM-DD-YYYY   function isValidDate subject     if  subject match       0 1-9  1 012    -      0 1-9   12  0-9  3 01    -      19 20  0-9  2            return true     else      return false          It will match only valid months and you can use   - or   as separators

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function isValidDate date            var valid   true           date   date replace   - g                 var month   parseInt date substring 0  2  10           var day     parseInt date substring 2  4  10           var year    parseInt date substring 4  8  10            if isNaN month     isNaN day     isNaN year   return false           if  month  lt  1      month  gt  12   valid   false          else if  day  lt  1      day  gt  31   valid   false          else if   month    4      month    6      month    9      month    11    amp  amp   day  gt  30   valid   false          else if  month    2   amp  amp     year   400     0       year   4     0    amp  amp    year   100     0   amp  amp   day  gt  29   valid   false          else if  month    2   amp  amp    year   100     0   amp  amp   day  gt  29   valid   false          else if  month    2   amp  amp   day  gt  28   valid   false       return valid      This checks for valid days in each month and for valid leap year days

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You can simplify it somewhat by changing the first two lines of the function to this   var matches   this match     0-9  2      0-9  2      0-9  4         Or  just change the parameter to the RegExp constructor to be      0-9  2      0-9  2      0-9  4

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I use this regex for validating MM-DD-YYYY   function isValidDate subject     if  subject match       0 1-9  1 012    -      0 1-9   12  0-9  3 01    -      19 20  0-9  2            return true     else      return false          It will match only valid months and you can use   - or   as separators

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Expanding on  quot Short and Fast quot  above by  Adam Leggett  as cases like  quot 02 30 2020 quot  return true when it should be false  I really dig the bitmap though    For a  MM DD YYYY date format validation  const dateValid    date    gt      const isLeapYear    yearNum    gt        return   yearNum   100     0     yearNum   400     0     yearNum   4     0          1        0        const match   date match     d d     d d     d 4               const month    match 1    0  - 1    const day   match 2    0    const year   match 3    0   const dateEval    month  lt  0                           Before January       month  gt  11                          After December       day  lt  1                           Before the 1st of the month       day - 30  gt   2773  gt  gt  month  amp  1           month     1  amp  amp  day - 28  gt  isLeapYear year            Day is 28 or 29  month is 02  year is leap year    gt  true           return   nDate    date  n n        Valid Date     dateEval  n                                               console log dateValid  02 28 2020       true console log dateValid  02 29 2020       true console log dateValid  02 30 2020       false console log dateValid  01 31 2020       true console log dateValid  01 31 2000       true console log dateValid  04 31 2020       false console log dateValid  04 31 2000       false console log dateValid  04 30 2020       true console log dateValid  01 32 2020       false console log dateValid  02 28 2021       true console log dateValid  02 29 2021       false console log dateValid  02 30 2021       false console log dateValid  02 28 2000       true console log dateValid  02 29 2000       true console log dateValid  02 30 2000       false console log dateValid  02 28 2001       true console log dateValid  02 29 2001       false console log dateValid  02 30 2001       false  For a  MM-DD-YYYY date format validation  Replace    in the pattern for match by -

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Short and fast    x000D   x000D  function dateValid date    x000D    var match   date match     d d -  d d -  d 4             x000D    var m    match 1    0  - 1  x000D    var d   match 2    0  x000D    var y   match 3    0  x000D    return    x000D        m  lt  0                           Before January x000D        m  gt  11                          After December x000D        d  lt  1                           Before the 1st of the month x000D        d - 30  gt   2773  gt  gt  m  amp  1         After the 30th or 31st of the month using bitmap x000D        m    1  amp  amp  d - 28  gt               After the 28th or 29th of February depending on leap year x000D               y   4   amp  amp  y   100      y   400     x000D    x000D   x000D  console log  02-29-2000   dateValid  02-29-2000     x000D  console log  02-29-2001   dateValid  02-29-2001     x000D  console log  12-31-1970   dateValid  12-31-1970     x000D  console log  Hello   dateValid  Hello     x000D   x000D   x000D

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function isValidDate date        var matches       d 1 2   -     d 1 2   -     d 4     exec date       if  matches    null  return false      var d   matches 2       var m   matches 1  - 1      var y   matches 3       var composedDate   new Date y  m  d       return composedDate getDate      d  amp  amp              composedDate getMonth      m  amp  amp              composedDate getFullYear      y    console log isValidDate  10-12-1961     console log isValidDate  12 11 1961     console log isValidDate  02-11-1961     console log isValidDate  12 01 1961     console log isValidDate  13-11-1961     console log isValidDate  11-31-1961     console log isValidDate  11-31-1061       It works   Tested with Firebug  hence the console log

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German Variant  but could be adapted to Iso  export function isLeapYear year      return       year   4     0  amp  amp   year   100    0    year   1000     0    year   400     0         export function isValidGermanDate germanDate      if        germanDate        germanDate length  lt  5        germanDate split      length  lt  3           return false        const day   parseInt germanDate split      0     const month   parseInt germanDate split      1     const year   parseInt germanDate split      2      if  isNaN month     isNaN day     isNaN year         return false        if  month  lt  1    month  gt  12        return false        if  day  lt  1    day  gt  31        return false        if   month     4    month     6    month     9    month     11   amp  amp  day  gt  30        return false        if  isLeapYear year         if  month     2  amp  amp  day  gt  29          return false           else       if  month     2  amp  amp  day  gt  28          return false              return true

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You can simplify it somewhat by changing the first two lines of the function to this   var matches   this match     0-9  2      0-9  2      0-9  4         Or  just change the parameter to the RegExp constructor to be      0-9  2      0-9  2      0-9  4

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How about validating dates in  ANY  date format   I ve been using the DateJS library and adding it to existing forms to ensure that I get valid dates  amp  times formatted the way that I want   The user can even enter things like  now  and  tomorrow  and it will be converted into a valid date   Here s the dateJS library  http   www datejs com   and here s a jQuery tip that I wrote  http   www ssmedia com utilities jquery index cfm datejs htm

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lt  DOCTYPE html gt     lt html gt     lt head gt      lt title gt  lt  title gt      lt script gt       function dateCheck inputText             debugger            var dateFormat      0  1-9   12  0-9  3 01      -  0  1-9  1 012      -  d 4               var flag   1            if  inputText value match dateFormat                  document myForm dateInput focus                  var inputFormat1   inputText value split                    var inputFormat2   inputText value split  -                 linputFormat1   inputFormat1 length               linputFormat2   inputFormat2 length                if  linputFormat1  gt  1                     var pdate   inputText value split                                   else if  linputFormat2  gt  1                     var pdate   inputText value split  -                                var date   parseInt pdate 0                 var month   parseInt pdate 1                 var year   parseInt pdate 2                  var ListofDays    31  28  31  30  31  30  31  31  30  31  30  31                if  month    1    month  gt  2                     if  date  gt  ListofDays month - 1                          alert  Invalid date format                          return false                                                  if  month    2                     var leapYear   false                    if     year   4   amp  amp  year   100       year   400                          leapYear   true                                       if   leapYear    false   amp  amp   date  gt   29                          alert  Invalid date format                          return false                                      if   leapYear    true   amp  amp   date  gt  29                          alert  Invalid date format                          return false                                                 if  flag    1                     alert  Valid Date                                       else                alert  Invalid date format                  document myForm dateInput focus                 return false                         function restrictCharacters evt              evt    evt    evt   window event           var charCode    evt which    evt which   evt keyCode           if    charCode  gt    48    amp  amp   charCode  lt    57        charCode     47                   return true                      else                return false                        lt  script gt      lt  head gt      lt body gt         lt div gt             lt form name  myForm  action     gt                  lt table gt                   lt tr gt                       lt td gt Enter Date lt  td gt                       lt td gt  lt input type  text  onkeypress  return restrictCharacters event    name  dateInput   gt  lt  td gt                       lt td gt  lt  td gt                       lt td gt  lt span id  span2  gt  lt  span gt  lt  td gt                   lt  tr gt                    lt tr gt                       lt td gt  lt  td gt                       lt td gt  lt input type  button  name  submit  value  Submit  onclick  dateCheck document myForm dateInput      gt  lt  td gt                   lt  tr gt               lt  table gt           lt  form gt         lt  div gt      lt  body gt     lt  html gt

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This function will validate the date to see if it s correct or if it s in the proper format of  DD MM YYYY   function isValidDate date        var matches       d 2   -     d 2   -     d 4     exec date       if  matches    null  return false      var d   matches 1       var m   matches 2 -1      var y   matches 3       var composedDate   new Date y  m  d       return composedDate getDate      d  amp  amp             composedDate getMonth      m  amp  amp             composedDate getFullYear      y    console log isValidDate  10-12-1961     console log isValidDate  12 11 1961     console log isValidDate  02-11-1961     console log isValidDate  12 01 1961     console log isValidDate  13-11-1961     console log isValidDate  11-31-1961     console log isValidDate  11-31-1061

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This is for validating the date string in formate dd mm yyyy It is easy to customize it  You just need to adjust the pos1 and pos2 in isValidDate      var dtCh           var minYear 1900   function isInteger s       var i      for  i   0  i  lt  s length  i                   Check that current character is number          var c   s charAt i           if    c  lt   0       c  gt   9     return false               All characters are numbers      return true     function stripCharsInBag s  bag       var i      var returnString              Search through string s characters one by one         If character is not in bag  append to returnString      for  i   0  i  lt  s length  i                var c   s charAt i           if  bag indexOf c     -1  returnString    c            return returnString     function daysInFebruary  year          February has 29 days in any year evenly divisible by four         EXCEPT for centurial years which are not also divisible by 400      return    year   4    0   amp  amp       year   100    0       year   400    0      29   28      function DaysArray n        for  var i   1  i  lt   n  i              this i    31          if  i  4    i  6    i  9    i  11                this i    30                    if  i  2                this i    29                     return this     function isValidDate dtStr       var daysInMonth   DaysArray 12       var pos1 dtStr indexOf dtCh       var pos2 dtStr indexOf dtCh pos1 1       var strDay dtStr substring 0 pos1       var strMonth dtStr substring pos1 1 pos2       var strYear dtStr substring pos2 1       strYr strYear      if  strDay charAt 0    0   amp  amp  strDay length gt 1           strDay strDay substring 1       if  strMonth charAt 0    0   amp  amp  strMonth length gt 1           strMonth strMonth substring 1       for  var i   1  i  lt   3  i              if  strYr charAt 0    0   amp  amp  strYr length gt 1               strYr strYr substring 1             month parseInt strMonth       day parseInt strDay       year parseInt strYr       if  pos1  -1    pos2  -1           alert  The date format should be   dd mm yyyy            return false            if  strMonth length lt 1    month lt 1    month gt 12           alert  Please enter a valid month            return false            if  strDay length lt 1    day lt 1    day gt 31     month  2  amp  amp  day gt daysInFebruary year      day  gt  daysInMonth month            alert  Please enter a valid day            return false            if  strYear length    4    year  0    year lt minYear           alert  Please enter a valid 4 digit year after   minYear           return false            if  dtStr indexOf dtCh pos2 1   -1    isInteger stripCharsInBag dtStr  dtCh    false           alert  Please enter a valid date            return false            return true

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Please find in the below code which enables to perform the date validation for any of the supplied format or based on user locale to validate start from and end to dates  There could be some better approaches but have come up with this  Have tested it for the formats like  MM dd yyyy  dd MM yyyy  yyyy-MM-dd  yyyy MM dd  yyyy MM dd and dd-MM-yyyy    Note supplied date format and date string go hand in hand    lt script type  text javascript  gt  function validate format         if isAfterCurrentDate document getElementById  start   value  format             alert  Date is after the current date           else           alert  Date is not after the current date               if isBeforeCurrentDate document getElementById  start   value  format             alert  Date is before current date           else           alert  Date is not before current date               if isCurrentDate document getElementById  start   value  format             alert  Date is current date           else           alert  Date is not a current date               if  isBefore document getElementById  start   value  document getElementById  end   value  format             alert  Start Effective Date cannot be greater than End Expiration Date          else           alert  Valid dates                 if  isAfter document getElementById  start   value  document getElementById  end   value  format             alert  End Expiration Date cannot be less than Start Effective Date          else           alert  Valid dates                 if  isEquals document getElementById  start   value  document getElementById  end   value  format             alert  Dates are equals             else           alert  Dates are not equals                 if  isDate document getElementById  start   value  format             alert  Is valid date             else           alert  Is invalid date                       This method gets the year index from the supplied format     function getYearIndex format         var tokens   splitDateFormat format        if  tokens 0       YYYY                 tokens 0       yyyy             return 0        else if  tokens 1      YYYY                 tokens 1       yyyy             return 1        else if  tokens 2       YYYY                 tokens 2       yyyy             return 2               Returning the default value as -1     return -1            This method returns the year string located at the supplied index     function getYear date  index         var tokens   splitDateFormat date       return tokens index             This method gets the month index from the supplied format     function getMonthIndex format         var tokens   splitDateFormat format        if  tokens 0       MM                 tokens 0       mm             return 0        else if  tokens 1       MM                 tokens 1       mm             return 1        else if  tokens 2       MM                 tokens 2       mm             return 2               Returning the default value as -1     return -1            This method returns the month string located at the supplied index     function getMonth date  index         var tokens   splitDateFormat date       return tokens index             This method gets the date index from the supplied format     function getDateIndex format         var tokens   splitDateFormat format        if  tokens 0       DD                 tokens 0       dd             return 0        else if  tokens 1       DD                 tokens 1       dd             return 1        else if  tokens 2       DD                 tokens 2       dd             return 2               Returning the default value as -1     return -1            This method returns the date string located at the supplied index     function getDate date  index         var tokens   splitDateFormat date       return tokens index             This method returns true if date1 is before date2 else return false     function isBefore date1  date2  format           Validating if date1 date is greater than the date2 date     if  new Date getYear date1  getYearIndex format                 getMonth date1  getMonthIndex format   - 1               getDate date1  getDateIndex format    getTime            gt  new Date getYear date2  getYearIndex format                 getMonth date2  getMonthIndex format   - 1               getDate date2  getDateIndex format    getTime              return true             return false                            This method returns true if date1 is after date2 else return false     function isAfter date1  date2  format           Validating if date2 date is less than the date1 date     if  new Date getYear date2  getYearIndex format                 getMonth date2  getMonthIndex format   - 1               getDate date2  getDateIndex format    getTime            lt  new Date getYear date1  getYearIndex format                 getMonth date1  getMonthIndex format   - 1               getDate date1  getDateIndex format    getTime                       return true             return false                            This method returns true if date1 is equals to date2 else return false     function isEquals date1  date2  format           Validating if date1 date is equals to the date2 date     if  new Date getYear date1  getYearIndex format                 getMonth date1  getMonthIndex format   - 1               getDate date1  getDateIndex format    getTime               new Date getYear date2  getYearIndex format                 getMonth date2  getMonthIndex format   - 1               getDate date2  getDateIndex format    getTime              return true             return false            This method validates and returns true if the supplied date is     equals to the current date      function isCurrentDate date  format           Validating if the supplied date is the current date     if  new Date getYear date  getYearIndex format                 getMonth date  getMonthIndex format   - 1               getDate date  getDateIndex format    getTime               new Date new Date   getFullYear                     new Date   getMonth                     new Date   getDate    getTime              return true             return false                            This method validates and returns true if the supplied date value     is before the current date      function isBeforeCurrentDate date  format           Validating if the supplied date is before the current date     if  new Date getYear date  getYearIndex format                 getMonth date  getMonthIndex format   - 1               getDate date  getDateIndex format    getTime            lt  new Date new Date   getFullYear                     new Date   getMonth                     new Date   getDate    getTime              return true             return false                            This method validates and returns true if the supplied date value     is after the current date      function isAfterCurrentDate date  format           Validating if the supplied date is before the current date     if  new Date getYear date  getYearIndex format                 getMonth date  getMonthIndex format   - 1               getDate date  getDateIndex format    getTime            gt  new Date new Date   getFullYear                    new Date   getMonth                     new Date   getDate    getTime              return true             return false                            This method splits the supplied date OR format based     on non alpha numeric characters in the supplied string      function splitDateFormat dateFormat           Spliting the supplied string based on non characters     return dateFormat split   W             This method validates if the supplied value is a valid date      function isDate date  format                           Validating if the supplied date string is valid and not a NaN  Not a Number      if   isNaN new Date getYear date  getYearIndex format                 getMonth date  getMonthIndex format   - 1               getDate date  getDateIndex format                                    return true             return false                                                 Below is the HTML snippet        lt input type  text  name  start  id  start  size  10  value  05 31 2016    gt   lt br  gt    lt input type  text  name  end  id  end  size  10  value  04 28 2016    gt   lt br  gt   lt input type  button  value  Submit  onclick  javascript validate  MM dd yyyy       gt

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lt script language    Javascript  gt     Declaring valid date character  minimum year and maximum year var dtCh       var minYear 1900  var maxYear 2100   function isInteger s       var i      for  i   0  i  lt  s length  i                   Check that current character is number          var c   s charAt i           if    c  lt   0       c  gt   9     return false               All characters are numbers      return true     function stripCharsInBag s  bag       var i      var returnString              Search through string s characters one by one         If character is not in bag  append to returnString      for  i   0  i  lt  s length  i                var c   s charAt i           if  bag indexOf c     -1  returnString    c            return returnString     function daysInFebruary  year          February has 29 days in any year evenly divisible by four         EXCEPT for centurial years which are not also divisible by 400      return    year   4    0   amp  amp       year   100    0       year   400    0      29   28      function DaysArray n        for  var i   1  i  lt   n  i              this i    31         if  i  4    i  6    i  9    i  11   this i    30          if  i  2   this i    29           return this    function isDate dtStr       var daysInMonth   DaysArray 12      var pos1 dtStr indexOf dtCh      var pos2 dtStr indexOf dtCh pos1 1      var strDay dtStr substring 0 pos1      var strMonth dtStr substring pos1 1 pos2      var strYear dtStr substring pos2 1      strYr strYear     if  strDay charAt 0    0   amp  amp  strDay length gt 1  strDay strDay substring 1      if  strMonth charAt 0    0   amp  amp  strMonth length gt 1  strMonth strMonth substring 1      for  var i   1  i  lt   3  i              if  strYr charAt 0    0   amp  amp  strYr length gt 1  strYr strYr substring 1            month parseInt strMonth      day parseInt strDay      year parseInt strYr      if  pos1  -1    pos2  -1           alert  The date format should be   dd mm yyyy           return false           if  strMonth length lt 1    month lt 1    month gt 12           alert  Please enter a valid month           return false           if  strDay length lt 1    day lt 1    day gt 31     month  2  amp  amp  day gt daysInFebruary year      day  gt  daysInMonth month            alert  Please enter a valid day           return false           if  strYear length    4    year  0    year lt minYear    year gt maxYear           alert  Please enter a valid 4 digit year between   minYear   and   maxYear          return false           if  dtStr indexOf dtCh pos2 1   -1    isInteger stripCharsInBag dtStr  dtCh    false           alert  Please enter a valid date           return false       return true    function ValidateForm        var dt document frmSample txtDateenter code here     if  isDate dt value   false           dt focus           return false           return true      lt  script gt

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DateFormat   DD MM YYYY or D M YYYY  function dateValidate val    var dateStr   val split          var date   new Date dateStr 2   dateStr 1 -1  dateStr 0       if date getDate      dateStr 0   amp  amp  date getMonth   1    dateStr 1   amp  amp  date getFullYear      dateStr 2       return date      else  return  NotValid

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what isn t working about it  here s a tested version  String prototype isValidDate   function            const match   this match     0-9  2      0-9  2      0-9  4           if   match    match length     4            return false            const test   new Date match 3   match 1  - 1  match 2         return            test getMonth      match 1  - 1   amp  amp           test getDate      match 2    amp  amp           test getFullYear      match 3             var date    12 08 1984      Date   is  Sat Dec 08 1984 00 00 00 GMT-0800  PST   alert date isValidDate         true

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Simple way to solve  var day   document getElementById  DayTextBox   value   var regExp       1-9   1  012     -  1-9   1  0-9   2  0-9   3  01     -  1  6-9  0-9  0-9   2  0  01  0-9       return regExp test day

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I use this regex for validating MM-DD-YYYY   function isValidDate subject     if  subject match       0 1-9  1 012    -      0 1-9   12  0-9  3 01    -      19 20  0-9  2            return true     else      return false          It will match only valid months and you can use   - or   as separators

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what isn t working about it  here s a tested version  String prototype isValidDate   function            const match   this match     0-9  2      0-9  2      0-9  4           if   match    match length     4            return false            const test   new Date match 3   match 1  - 1  match 2         return            test getMonth      match 1  - 1   amp  amp           test getDate      match 2    amp  amp           test getFullYear      match 3             var date    12 08 1984      Date   is  Sat Dec 08 1984 00 00 00 GMT-0800  PST   alert date isValidDate         true

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pass this function to date with format   10-10-2012 and id of object   function isValidDateFormat date  id      var todayDate   new Date      var matches       d 2   -     d 2   -     d 4     exec date      if  matches    null         if date       -  -                   alert  Please enter valid date                else         var day      31      var month    12      var b date   date split  -        if b date 0   lt   day              if b date 1   lt   month                  if b date 2   gt   1900  amp  amp  b date 2   lt   todayDate getFullYear                        return true                    else                           id  val                alert  Please enter valid Year                                      else                       id  val              alert  Please enter valid Month                           else             alert  Please enter valid Day                id  val

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lt script language    Javascript  gt     Declaring valid date character  minimum year and maximum year var dtCh       var minYear 1900  var maxYear 2100   function isInteger s       var i      for  i   0  i  lt  s length  i                   Check that current character is number          var c   s charAt i           if    c  lt   0       c  gt   9     return false               All characters are numbers      return true     function stripCharsInBag s  bag       var i      var returnString              Search through string s characters one by one         If character is not in bag  append to returnString      for  i   0  i  lt  s length  i                var c   s charAt i           if  bag indexOf c     -1  returnString    c            return returnString     function daysInFebruary  year          February has 29 days in any year evenly divisible by four         EXCEPT for centurial years which are not also divisible by 400      return    year   4    0   amp  amp       year   100    0       year   400    0      29   28      function DaysArray n        for  var i   1  i  lt   n  i              this i    31         if  i  4    i  6    i  9    i  11   this i    30          if  i  2   this i    29           return this    function isDate dtStr       var daysInMonth   DaysArray 12      var pos1 dtStr indexOf dtCh      var pos2 dtStr indexOf dtCh pos1 1      var strDay dtStr substring 0 pos1      var strMonth dtStr substring pos1 1 pos2      var strYear dtStr substring pos2 1      strYr strYear     if  strDay charAt 0    0   amp  amp  strDay length gt 1  strDay strDay substring 1      if  strMonth charAt 0    0   amp  amp  strMonth length gt 1  strMonth strMonth substring 1      for  var i   1  i  lt   3  i              if  strYr charAt 0    0   amp  amp  strYr length gt 1  strYr strYr substring 1            month parseInt strMonth      day parseInt strDay      year parseInt strYr      if  pos1  -1    pos2  -1           alert  The date format should be   dd mm yyyy           return false           if  strMonth length lt 1    month lt 1    month gt 12           alert  Please enter a valid month           return false           if  strDay length lt 1    day lt 1    day gt 31     month  2  amp  amp  day gt daysInFebruary year      day  gt  daysInMonth month            alert  Please enter a valid day           return false           if  strYear length    4    year  0    year lt minYear    year gt maxYear           alert  Please enter a valid 4 digit year between   minYear   and   maxYear          return false           if  dtStr indexOf dtCh pos2 1   -1    isInteger stripCharsInBag dtStr  dtCh    false           alert  Please enter a valid date           return false       return true    function ValidateForm        var dt document frmSample txtDateenter code here     if  isDate dt value   false           dt focus           return false           return true      lt  script gt

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I would use Moment js for this task  It makes it very easy to parse dates and it also provides support to detect a an invalid date1 in the correct format  For instance  consider this example   var formats     MM-DD-YYYY    MM DD YYYY    moment  11 28 1981   formats  isValid       true moment  2-29-2003   formats  isValid        false  not leap year  moment  2-29-2004   formats  isValid        true   leap year    First moment     formats  is used to parse the input according to the localized format supplied  Then the isValid function is called on the resulting moment object so that we can actually tell if it is a valid date   This can be used to trivially derive the isValidDate method   String prototype isValidDate   function         var formats     MM-DD-YYYY    MM DD YYYY        return moment      this  formats  isValid          1 As I can find scarce little commentary on the matter  I would only use moment js for dates covered by the Gregorian calendar  There may be plugins for other  including historical or scientific  calendars

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lt  DOCTYPE html gt     lt html gt     lt head gt      lt title gt  lt  title gt      lt script gt       function dateCheck inputText             debugger            var dateFormat      0  1-9   12  0-9  3 01      -  0  1-9  1 012      -  d 4               var flag   1            if  inputText value match dateFormat                  document myForm dateInput focus                  var inputFormat1   inputText value split                    var inputFormat2   inputText value split  -                 linputFormat1   inputFormat1 length               linputFormat2   inputFormat2 length                if  linputFormat1  gt  1                     var pdate   inputText value split                                   else if  linputFormat2  gt  1                     var pdate   inputText value split  -                                var date   parseInt pdate 0                 var month   parseInt pdate 1                 var year   parseInt pdate 2                  var ListofDays    31  28  31  30  31  30  31  31  30  31  30  31                if  month    1    month  gt  2                     if  date  gt  ListofDays month - 1                          alert  Invalid date format                          return false                                                  if  month    2                     var leapYear   false                    if     year   4   amp  amp  year   100       year   400                          leapYear   true                                       if   leapYear    false   amp  amp   date  gt   29                          alert  Invalid date format                          return false                                      if   leapYear    true   amp  amp   date  gt  29                          alert  Invalid date format                          return false                                                 if  flag    1                     alert  Valid Date                                       else                alert  Invalid date format                  document myForm dateInput focus                 return false                         function restrictCharacters evt              evt    evt    evt   window event           var charCode    evt which    evt which   evt keyCode           if    charCode  gt    48    amp  amp   charCode  lt    57        charCode     47                   return true                      else                return false                        lt  script gt      lt  head gt      lt body gt         lt div gt             lt form name  myForm  action     gt                  lt table gt                   lt tr gt                       lt td gt Enter Date lt  td gt                       lt td gt  lt input type  text  onkeypress  return restrictCharacters event    name  dateInput   gt  lt  td gt                       lt td gt  lt  td gt                       lt td gt  lt span id  span2  gt  lt  span gt  lt  td gt                   lt  tr gt                    lt tr gt                       lt td gt  lt  td gt                       lt td gt  lt input type  button  name  submit  value  Submit  onclick  dateCheck document myForm dateInput      gt  lt  td gt                   lt  tr gt               lt  table gt           lt  form gt         lt  div gt      lt  body gt     lt  html gt

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try this   function validateDate dates       re       d 1 2      d 1 2      d 4               var days new Array 31 28 31 30 31 30 31 31 30 31 30 31                if regs   dates match re                            day value between 1 and 31                     if regs 1   lt  1    regs 1   gt  31                                              return false                                               month value between 1 and 12                     if regs 2   lt  1    regs 2   gt  12                                                   return false                                             var maxday days regs 2 -1                        if regs 2   2                           if regs 3  4  0                               maxday maxday 1                                                                                                       if regs 1  gt maxday                           return false                                             return true                 else                    return false

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Short and fast    x000D   x000D  function dateValid date    x000D    var match   date match     d d -  d d -  d 4             x000D    var m    match 1    0  - 1  x000D    var d   match 2    0  x000D    var y   match 3    0  x000D    return    x000D        m  lt  0                           Before January x000D        m  gt  11                          After December x000D        d  lt  1                           Before the 1st of the month x000D        d - 30  gt   2773  gt  gt  m  amp  1         After the 30th or 31st of the month using bitmap x000D        m    1  amp  amp  d - 28  gt               After the 28th or 29th of February depending on leap year x000D               y   4   amp  amp  y   100      y   400     x000D    x000D   x000D  console log  02-29-2000   dateValid  02-29-2000     x000D  console log  02-29-2001   dateValid  02-29-2001     x000D  console log  12-31-1970   dateValid  12-31-1970     x000D  console log  Hello   dateValid  Hello     x000D   x000D   x000D

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German Variant  but could be adapted to Iso  export function isLeapYear year      return       year   4     0  amp  amp   year   100    0    year   1000     0    year   400     0         export function isValidGermanDate germanDate      if        germanDate        germanDate length  lt  5        germanDate split      length  lt  3           return false        const day   parseInt germanDate split      0     const month   parseInt germanDate split      1     const year   parseInt germanDate split      2      if  isNaN month     isNaN day     isNaN year         return false        if  month  lt  1    month  gt  12        return false        if  day  lt  1    day  gt  31        return false        if   month     4    month     6    month     9    month     11   amp  amp  day  gt  30        return false        if  isLeapYear year         if  month     2  amp  amp  day  gt  29          return false           else       if  month     2  amp  amp  day  gt  28          return false              return true

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function isValidDate date        var matches       d 1 2   -     d 1 2   -     d 4     exec date       if  matches    null  return false      var d   matches 2       var m   matches 1  - 1      var y   matches 3       var composedDate   new Date y  m  d       return composedDate getDate      d  amp  amp              composedDate getMonth      m  amp  amp              composedDate getFullYear      y    console log isValidDate  10-12-1961     console log isValidDate  12 11 1961     console log isValidDate  02-11-1961     console log isValidDate  12 01 1961     console log isValidDate  13-11-1961     console log isValidDate  11-31-1961     console log isValidDate  11-31-1061       It works   Tested with Firebug  hence the console log

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You can simplify it somewhat by changing the first two lines of the function to this   var matches   this match     0-9  2      0-9  2      0-9  4         Or  just change the parameter to the RegExp constructor to be      0-9  2      0-9  2      0-9  4

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I would use Moment js for this task  It makes it very easy to parse dates and it also provides support to detect a an invalid date1 in the correct format  For instance  consider this example   var formats     MM-DD-YYYY    MM DD YYYY    moment  11 28 1981   formats  isValid       true moment  2-29-2003   formats  isValid        false  not leap year  moment  2-29-2004   formats  isValid        true   leap year    First moment     formats  is used to parse the input according to the localized format supplied  Then the isValid function is called on the resulting moment object so that we can actually tell if it is a valid date   This can be used to trivially derive the isValidDate method   String prototype isValidDate   function         var formats     MM-DD-YYYY    MM DD YYYY        return moment      this  formats  isValid          1 As I can find scarce little commentary on the matter  I would only use moment js for dates covered by the Gregorian calendar  There may be plugins for other  including historical or scientific  calendars

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If your date needs to match DD MM YYYY and use AngularJS  use the following code    scope validDate   function value               var matches       d 1 2       d 1 2       d 4     exec value               if  matches    null  return false              var d   matches 1               var m   matches 2  - 1              var y   matches 3               var composedDate   new Date y  m  d               return composedDate getDate      d  amp  amp                  composedDate getMonth      m  amp  amp                  composedDate getFullYear      y                         console log  scope validDate  22 04 2001                 console log  scope validDate  03 10 2001                 console log  scope validDate  30 02 2001                 console log  scope validDate  23 09 2016                 console log  scope validDate  29 02 2016                 console log  scope validDate  31 02 2016       More about the scope object can be found here  Without AngularJS  simply change the first line to   ValidDate   new function value      And call it using   var MyDate  ValidDate  29 09 2016

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This is for validating the date string in formate dd mm yyyy It is easy to customize it  You just need to adjust the pos1 and pos2 in isValidDate      var dtCh           var minYear 1900   function isInteger s       var i      for  i   0  i  lt  s length  i                   Check that current character is number          var c   s charAt i           if    c  lt   0       c  gt   9     return false               All characters are numbers      return true     function stripCharsInBag s  bag       var i      var returnString              Search through string s characters one by one         If character is not in bag  append to returnString      for  i   0  i  lt  s length  i                var c   s charAt i           if  bag indexOf c     -1  returnString    c            return returnString     function daysInFebruary  year          February has 29 days in any year evenly divisible by four         EXCEPT for centurial years which are not also divisible by 400      return    year   4    0   amp  amp       year   100    0       year   400    0      29   28      function DaysArray n        for  var i   1  i  lt   n  i              this i    31          if  i  4    i  6    i  9    i  11                this i    30                    if  i  2                this i    29                     return this     function isValidDate dtStr       var daysInMonth   DaysArray 12       var pos1 dtStr indexOf dtCh       var pos2 dtStr indexOf dtCh pos1 1       var strDay dtStr substring 0 pos1       var strMonth dtStr substring pos1 1 pos2       var strYear dtStr substring pos2 1       strYr strYear      if  strDay charAt 0    0   amp  amp  strDay length gt 1           strDay strDay substring 1       if  strMonth charAt 0    0   amp  amp  strMonth length gt 1           strMonth strMonth substring 1       for  var i   1  i  lt   3  i              if  strYr charAt 0    0   amp  amp  strYr length gt 1               strYr strYr substring 1             month parseInt strMonth       day parseInt strDay       year parseInt strYr       if  pos1  -1    pos2  -1           alert  The date format should be   dd mm yyyy            return false            if  strMonth length lt 1    month lt 1    month gt 12           alert  Please enter a valid month            return false            if  strDay length lt 1    day lt 1    day gt 31     month  2  amp  amp  day gt daysInFebruary year      day  gt  daysInMonth month            alert  Please enter a valid day            return false            if  strYear length    4    year  0    year lt minYear           alert  Please enter a valid 4 digit year after   minYear           return false            if  dtStr indexOf dtCh pos2 1   -1    isInteger stripCharsInBag dtStr  dtCh    false           alert  Please enter a valid date            return false            return true

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pass this function to date with format   10-10-2012 and id of object   function isValidDateFormat date  id      var todayDate   new Date      var matches       d 2   -     d 2   -     d 4     exec date      if  matches    null         if date       -  -                   alert  Please enter valid date                else         var day      31      var month    12      var b date   date split  -        if b date 0   lt   day              if b date 1   lt   month                  if b date 2   gt   1900  amp  amp  b date 2   lt   todayDate getFullYear                        return true                    else                           id  val                alert  Please enter valid Year                                      else                       id  val              alert  Please enter valid Month                           else             alert  Please enter valid Day                id  val

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if  document getElementById  expiryDay   value    test match      0-9  2      0-9  2               alert  Enter the date in two digit month flowed by two digits year  n

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I use this regex for validating MM-DD-YYYY   function isValidDate subject     if  subject match       0 1-9  1 012    -      0 1-9   12  0-9  3 01    -      19 20  0-9  2            return true     else      return false          It will match only valid months and you can use   - or   as separators

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DateFormat   DD MM YYYY or D M YYYY  function dateValidate val    var dateStr   val split          var date   new Date dateStr 2   dateStr 1 -1  dateStr 0       if date getDate      dateStr 0   amp  amp  date getMonth   1    dateStr 1   amp  amp  date getFullYear      dateStr 2       return date      else  return  NotValid

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what isn t working about it  here s a tested version  String prototype isValidDate   function            const match   this match     0-9  2      0-9  2      0-9  4           if   match    match length     4            return false            const test   new Date match 3   match 1  - 1  match 2         return            test getMonth      match 1  - 1   amp  amp           test getDate      match 2    amp  amp           test getFullYear      match 3             var date    12 08 1984      Date   is  Sat Dec 08 1984 00 00 00 GMT-0800  PST   alert date isValidDate         true

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If your date needs to match DD MM YYYY and use AngularJS  use the following code    scope validDate   function value               var matches       d 1 2       d 1 2       d 4     exec value               if  matches    null  return false              var d   matches 1               var m   matches 2  - 1              var y   matches 3               var composedDate   new Date y  m  d               return composedDate getDate      d  amp  amp                  composedDate getMonth      m  amp  amp                  composedDate getFullYear      y                         console log  scope validDate  22 04 2001                 console log  scope validDate  03 10 2001                 console log  scope validDate  30 02 2001                 console log  scope validDate  23 09 2016                 console log  scope validDate  29 02 2016                 console log  scope validDate  31 02 2016       More about the scope object can be found here  Without AngularJS  simply change the first line to   ValidDate   new function value      And call it using   var MyDate  ValidDate  29 09 2016

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function isValidDate date        var matches       d 1 2   -     d 1 2   -     d 4     exec date       if  matches    null  return false      var d   matches 2       var m   matches 1  - 1      var y   matches 3       var composedDate   new Date y  m  d       return composedDate getDate      d  amp  amp              composedDate getMonth      m  amp  amp              composedDate getFullYear      y    console log isValidDate  10-12-1961     console log isValidDate  12 11 1961     console log isValidDate  02-11-1961     console log isValidDate  12 01 1961     console log isValidDate  13-11-1961     console log isValidDate  11-31-1961     console log isValidDate  11-31-1061       It works   Tested with Firebug  hence the console log

[javascript] Javascript: how to validate dates in format MM-DD-YYYY?

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