Javascript - Regex to validate date format

Question

Is there any way to have a regex in JavaScript that validates dates of multiple formats  like  DD-MM-YYYY or DD MM YYYY or DD MM YYYY etc  I need all these in one regex and I m not really good with it  So far I ve come up with this  var dateReg      d 2 - d 2 - d 4     for DD-MM-YYYY  I only need to validate the date format  not the date itself

User · Answer

Don t re-invent the wheel  Use a pre-built solution for parsing dates  like http   www datejs com

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The suggested regex will not validate the date  only the pattern   So 99 99 9999 will pass the regex    You later specified that you only need to validate the pattern but I still think it is more useful to create a date object   x000D   x000D  function isDate str        x000D    var parms   str split      -       x000D    var yyyy   parseInt parms 2  10   x000D    var mm     parseInt parms 1  10   x000D    var dd     parseInt parms 0  10   x000D    var date   new Date yyyy mm-1 dd 0 0 0 0   x000D    return mm      date getMonth   1   amp  amp  dd     date getDate    amp  amp  yyyy     date getFullYear    x000D    x000D  var dates     x000D       13-09-2011    x000D       13 09 2011   x000D       13 09 2011   x000D       08-08-1991   x000D       29 02 2011  x000D    x000D   x000D  for  var i 0 i lt dates length i      x000D      console log dates i      isDate dates i     x000D        x000D   x000D   x000D

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If you want to validate your date YYYY-MM-DD  along with the comparison it will be use full for you         function validateDate              var newDate   new Date         var presentDate   newDate getDate         var presentMonth   newDate getMonth         var presentYear   newDate getFullYear         var dateOfBirthVal   document forms 0  dateOfBirth value      if  dateOfBirthVal    null       return false      var validatePattern       d 4      -   d 1 2      -   d 1 2          dateValues   dateOfBirthVal match validatePattern       if  dateValues    null                 alert  Date of birth should be null and it should in the format of yyyy-mm-dd       return false                var birthYear   dateValues 1               birthMonth   dateValues 3       birthDate   dateValues 5       if   birthMonth  lt  1      birthMonth  gt  12                  alert  Invalid date       return false                else if   birthDate  lt  1      birthDate gt  31                  alert  Invalid date       return false                else if   birthMonth  4    birthMonth  6    birthMonth  9    birthMonth  11   amp  amp  birthDate   31                 alert  Invalid date       return false                else if  birthMonth    2        var isleap    birthYear   4    0  amp  amp   birthYear   100    0    birthYear   400    0        if  birthDate gt  29     birthDate   29  amp  amp   isleap                  alert  Invalid date       return false                      else if  birthYear gt presentYear    birthYear 70 lt presentYear                     alert  Invalid date           return false                else if birthYear  presentYear                    if birthMonth gt presentMonth 1                            alert  Invalid date               return false                        else if birthMonth  presentMonth 1                            if birthDate gt presentDate                                    alert  Invalid date                   return false                                            return true

User · Answer

mplungjan   eduard-luca  function isDate str            var parms   str split      -           var yyyy   parseInt parms 2  10       var mm     parseInt parms 1  10       var dd     parseInt parms 0  10       var date   new Date yyyy mm-1 dd 12 0 0 0       return mm      date getMonth   1   amp  amp           dd     date getDate    amp  amp           yyyy     date getFullYear        new Date   uses local time  hour 00 00 00 will show the last day when we have  Summer Time  or  DST  Daylight Saving Time   events   Example    new Date 2010 9 17  Sat Oct 16 2010 23 00 00 GMT-0300  BRT    Another alternative is to use getUTCDate

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To make sure it will work  you need to validate it   function mmIsDate str         if  str    undefined    return false         var parms   str split      -            var yyyy   parseInt parms 2   10        if  yyyy  lt  1900    return false         var mm   parseInt parms 1   10       if  mm  lt  1    mm  gt  12    return false         var dd   parseInt parms 0   10       if  dd  lt  1    dd  gt  31    return false         var dateCheck   new Date yyyy  mm - 1  dd       return  dateCheck getDate       dd  amp  amp   dateCheck getMonth       mm - 1   amp  amp  dateCheck getFullYear       yyyy

User · Answer

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

User · Answer

You could use a character class     -   so that the seperators can be any of the defined characters  var dateReg      d 2    -  d 2    -  d 4      Or better still  match the character class for the first seperator  then capture that as a group     -   and use a reference to the captured group  1 to match the second seperator  which will ensure that both seperators are the same   var dateReg      d 2     -   d 2  1 d 4      22-03-1981  match dateReg     matches  22 03-1981  match dateReg     does not match  22 03 1981  match dateReg     matches

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Format  days  months and year   var regex      0 1-9   12  0-9  3 01   -     0 1-9  1 012   -     19 20  d d

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Make use of brackets    d 2   -   d 2   -   d 4    http   download oracle com javase tutorial essential regex char classes html

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You can use regular multiple expressions with the use of OR     operator   function validateDate date       var regex new RegExp    0-9  4  -  0 1-9  1 0-2   -   0-2  1  0-9  1  3 0-1  1     0-2  1  0-9  1  3 0-1  1   -  0 1-9  1 0-2   -  0-9  4          var dateOk regex test date       if dateOk           alert  Ok         else          alert  not Ok              Above function can validate YYYY-MM-DD  DD-MM-YYYY date formats  You can simply extend the regular expression to validate any date format  Assume you want to validate YYYY MM DD  just replace   -   with   -      This expression can validate dates to 31  months to 12  But leap years and months ends with 30 days are not validated

User · Answer

Try this     d d   -  d d   -  d d d d

[javascript] Javascript - Regex to validate date format

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