How do I do a Date comparison in Javascript

Question

I would like to compare two dates in javascript   I have been doing some research  but all I can find is how to return the current date   I want to compare 2 separate dates  not related to today   How do I do that    var startDate   Date document form1 Textbox2

User · Accepted Answer

if  date1 getTime    gt  date2 getTime          alert  The first date is after the second date         Reference to Date object

User · Answer

You could try adding the following script code to implement this   if CompareDates smallDate largeDate  -      0        alert  Selected date must be current date or previous date     return false     function CompareDates smallDate largeDate separator        var smallDateArr   Array        var largeDateArr   Array         smallDateArr   smallDate split separator       largeDateArr   largeDate split separator         var smallDt   smallDateArr 0       var smallMt   smallDateArr 1       var smallYr   smallDateArr 2         var largeDt   largeDateArr 0       var largeMt   largeDateArr 1       var largeYr   largeDateArr 2        if smallYr gt largeYr           return 0  else if smallYr lt  largeYr  amp  amp  smallMt gt largeMt      return 0  else if smallYr lt  largeYr  amp  amp  smallMt  largeMt  amp  amp  smallDt gt largeDt      return 0  else      return 1

User · Answer

You can use the getTime   method on a Date object to get the timestamp  in milliseconds  relative to January 1  1970   If you convert your two dates into integer timestamps  you can then compare the difference by subtracting them   The result will be in milliseconds so you just divide by 1000 for seconds  then 60 for minutes  etc

User · Answer

I would rather use the Date valueOf method instead of     or      Seems like     is comparing internal Object s references and nothing concerning date

User · Answer

JavaScript s dates can be compared using the same comparison operators the rest of the data types use      lt    lt                            If you have two dates A and B  then A  lt  B if A is further back into the past than B   But it sounds like what you re having trouble with is turning a string into a date  You do that by simply passing the string as an argument for a new Date   var someDate   new Date  12 03 2008      or  if the string you want is the value of a form field  as it seems it might be   var someDate   new Date document form1 Textbox2 value     Should that string not be something that JavaScript recognizes as a date  you will still get a Date object  but it will be  invalid   Any comparison with another date will return false  When converted to a string it will become  Invalid Date   Its getTime   function will return NaN  and calling isNaN   on the date itself will return true  that s the easy way to check if a string is a valid date

User · Answer

new Date  1945 05 09   valueOf    lt  new Date  2011 05 09   valueOf

User · Answer

You can try this code for checking which date value is the highest from two dates with a format MM DD YYYY   function d check         var dl sdt document getElementIdBy  date input Id1   value    date one     var dl endt document getElementIdBy  date input Id2   value    date two      if  dl sdt substr 6 4    gt   dl endt substr 6 4              alert  first date is greater            return false             else if    dl sdt substr 0 2    gt   dl endt          substr 0 2    amp  amp  frdt dl sdt substr 3 2    gt   dl endt substr 3 2                  dl sdt substr 0 2    gt   dl endt substr 0 2    amp  amp            dl sdt substr 3 2    lt   dl endt substr 3 2                  dl sdt substr 0 2       dl endt substr 0 2    amp  amp   dl sdt substr 3 2    gt            dl endt substr 3 2                    alert  first date is greater            return false             alert  second date is digher        return true        for checking this    create a form and give id s to two date inputs The date format should be mm dd yyyy or mm-dd-yyyy or mm dd yyyy or mm dd yyyy like this

User · Answer

You can use the getTime   method on a Date object to get the timestamp  in milliseconds  relative to January 1  1970   If you convert your two dates into integer timestamps  you can then compare the difference by subtracting them   The result will be in milliseconds so you just divide by 1000 for seconds  then 60 for minutes  etc

User · Answer

function validateform              if  trimAll document getElementById   lt   txtFromDate ClientID   gt    value              if   isDate trimAll document getElementById   lt   txtFromDate ClientID   gt    value             msg   msg     lt li gt Please enter valid From Date in mm dd yyyy format n      else          var toDate   new Date           var txtdate   document getElementById   lt   txtFromDate ClientID   gt    value         var d1   new Date txtdate     if  Date parse txtdate   gt  Date parse toDate                                 msg   msg     lt li gt From date must be less than or equal to today s date n                    if  trimAll document getElementById   lt   txtToDate ClientID   gt    value                       if   isDate trimAll document getElementById   lt   txtToDate ClientID   gt    value                    msg   msg     lt li gt Please enter valid To Date in mm dd yyyy format n               else                   var toDate   new Date                    var txtdate   document getElementById   lt   txtToDate ClientID   gt    value                  var d1   new Date txtdate                   if  Date parse txtdate   gt  Date parse toDate                         msg   msg     lt li gt To date must be less than or equal to today s date n

User · Answer

new Date  1945 05 09   valueOf    lt  new Date  2011 05 09   valueOf

User · Answer

I would rather use the Date valueOf method instead of     or      Seems like     is comparing internal Object s references and nothing concerning date

User · Answer

JavaScript s dates can be compared using the same comparison operators the rest of the data types use      lt    lt                            If you have two dates A and B  then A  lt  B if A is further back into the past than B   But it sounds like what you re having trouble with is turning a string into a date  You do that by simply passing the string as an argument for a new Date   var someDate   new Date  12 03 2008      or  if the string you want is the value of a form field  as it seems it might be   var someDate   new Date document form1 Textbox2 value     Should that string not be something that JavaScript recognizes as a date  you will still get a Date object  but it will be  invalid   Any comparison with another date will return false  When converted to a string it will become  Invalid Date   Its getTime   function will return NaN  and calling isNaN   on the date itself will return true  that s the easy way to check if a string is a valid date

User · Answer

You could try adding the following script code to implement this   if CompareDates smallDate largeDate  -      0        alert  Selected date must be current date or previous date     return false     function CompareDates smallDate largeDate separator        var smallDateArr   Array        var largeDateArr   Array         smallDateArr   smallDate split separator       largeDateArr   largeDate split separator         var smallDt   smallDateArr 0       var smallMt   smallDateArr 1       var smallYr   smallDateArr 2         var largeDt   largeDateArr 0       var largeMt   largeDateArr 1       var largeYr   largeDateArr 2        if smallYr gt largeYr           return 0  else if smallYr lt  largeYr  amp  amp  smallMt gt largeMt      return 0  else if smallYr lt  largeYr  amp  amp  smallMt  largeMt  amp  amp  smallDt gt largeDt      return 0  else      return 1

User · Answer

function fn DateCompare DateA  DateB           this function is good for dates  gt  01 01 1970      var a   new Date DateA       var b   new Date DateB        var msDateA   Date UTC a getFullYear    a getMonth   1  a getDate         var msDateB   Date UTC b getFullYear    b getMonth   1  b getDate          if  parseFloat msDateA   lt  parseFloat msDateB         return -1      lt     else if  parseFloat msDateA     parseFloat msDateB         return 0      eq     else if  parseFloat msDateA   gt  parseFloat msDateB         return 1      gt     else       return null      error

User · Answer

function fn DateCompare DateA  DateB           this function is good for dates  gt  01 01 1970      var a   new Date DateA       var b   new Date DateB        var msDateA   Date UTC a getFullYear    a getMonth   1  a getDate         var msDateB   Date UTC b getFullYear    b getMonth   1  b getDate          if  parseFloat msDateA   lt  parseFloat msDateB         return -1      lt     else if  parseFloat msDateA     parseFloat msDateB         return 0      eq     else if  parseFloat msDateA   gt  parseFloat msDateB         return 1      gt     else       return null      error

User · Answer

function validateform              if  trimAll document getElementById   lt   txtFromDate ClientID   gt    value              if   isDate trimAll document getElementById   lt   txtFromDate ClientID   gt    value             msg   msg     lt li gt Please enter valid From Date in mm dd yyyy format n      else          var toDate   new Date           var txtdate   document getElementById   lt   txtFromDate ClientID   gt    value         var d1   new Date txtdate     if  Date parse txtdate   gt  Date parse toDate                                 msg   msg     lt li gt From date must be less than or equal to today s date n                    if  trimAll document getElementById   lt   txtToDate ClientID   gt    value                       if   isDate trimAll document getElementById   lt   txtToDate ClientID   gt    value                    msg   msg     lt li gt Please enter valid To Date in mm dd yyyy format n               else                   var toDate   new Date                    var txtdate   document getElementById   lt   txtToDate ClientID   gt    value                  var d1   new Date txtdate                   if  Date parse txtdate   gt  Date parse toDate                         msg   msg     lt li gt To date must be less than or equal to today s date n

User · Answer

You can try this code for checking which date value is the highest from two dates with a format MM DD YYYY   function d check         var dl sdt document getElementIdBy  date input Id1   value    date one     var dl endt document getElementIdBy  date input Id2   value    date two      if  dl sdt substr 6 4    gt   dl endt substr 6 4              alert  first date is greater            return false             else if    dl sdt substr 0 2    gt   dl endt          substr 0 2    amp  amp  frdt dl sdt substr 3 2    gt   dl endt substr 3 2                  dl sdt substr 0 2    gt   dl endt substr 0 2    amp  amp            dl sdt substr 3 2    lt   dl endt substr 3 2                  dl sdt substr 0 2       dl endt substr 0 2    amp  amp   dl sdt substr 3 2    gt            dl endt substr 3 2                    alert  first date is greater            return false             alert  second date is digher        return true        for checking this    create a form and give id s to two date inputs The date format should be mm dd yyyy or mm-dd-yyyy or mm dd yyyy or mm dd yyyy like this

User · Answer

I would rather use the Date valueOf method instead of     or      Seems like     is comparing internal Object s references and nothing concerning date

User · Answer

I would rather use the Date valueOf method instead of     or      Seems like     is comparing internal Object s references and nothing concerning date

User · Answer

JavaScript s dates can be compared using the same comparison operators the rest of the data types use      lt    lt                            If you have two dates A and B  then A  lt  B if A is further back into the past than B   But it sounds like what you re having trouble with is turning a string into a date  You do that by simply passing the string as an argument for a new Date   var someDate   new Date  12 03 2008      or  if the string you want is the value of a form field  as it seems it might be   var someDate   new Date document form1 Textbox2 value     Should that string not be something that JavaScript recognizes as a date  you will still get a Date object  but it will be  invalid   Any comparison with another date will return false  When converted to a string it will become  Invalid Date   Its getTime   function will return NaN  and calling isNaN   on the date itself will return true  that s the easy way to check if a string is a valid date

User · Answer

You can use the getTime   method on a Date object to get the timestamp  in milliseconds  relative to January 1  1970   If you convert your two dates into integer timestamps  you can then compare the difference by subtracting them   The result will be in milliseconds so you just divide by 1000 for seconds  then 60 for minutes  etc

User · Answer

JavaScript s dates can be compared using the same comparison operators the rest of the data types use      lt    lt                            If you have two dates A and B  then A  lt  B if A is further back into the past than B   But it sounds like what you re having trouble with is turning a string into a date  You do that by simply passing the string as an argument for a new Date   var someDate   new Date  12 03 2008      or  if the string you want is the value of a form field  as it seems it might be   var someDate   new Date document form1 Textbox2 value     Should that string not be something that JavaScript recognizes as a date  you will still get a Date object  but it will be  invalid   Any comparison with another date will return false  When converted to a string it will become  Invalid Date   Its getTime   function will return NaN  and calling isNaN   on the date itself will return true  that s the easy way to check if a string is a valid date

User · Answer

You can use the getTime   method on a Date object to get the timestamp  in milliseconds  relative to January 1  1970   If you convert your two dates into integer timestamps  you can then compare the difference by subtracting them   The result will be in milliseconds so you just divide by 1000 for seconds  then 60 for minutes  etc

[javascript] How do I do a Date comparison in Javascript?

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