Get difference between 2 dates in JavaScript

Question

How do I get the difference between 2 dates in full days  I don t want any fractions of a day   var date1   new Date  7 11 2010    var date2   new Date  12 12 2010    var diffDays   date2 getDate   - date1 getDate     alert diffDays    I tried the above but this did not work

User · Answer

Here is a solution using moment js   var a   moment  7 11 2010   M D YYYY    var b   moment  12 12 2010   M D YYYY    var diffDays   b diff a   days    alert diffDays     I used your original input values  but you didn t specify the format so I assumed the first value was July 11th   If it was intended to be November 7th  then adjust the format to D M YYYY instead

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A more correct solution      since dates naturally have time-zone information  which can span regions with different day light savings adjustments  Previous answers to this question don t account for cases where the two dates in question span a daylight saving time  DST  change  The date on which the DST change happens will have a duration in milliseconds which is    1000 60 60 24  so the typical calculation will fail   You can work around this by first normalizing the two dates to UTC  and then calculating the difference between those two UTC dates   Now  the solution can be written as   const  MS PER DAY   1000   60   60   24      a and b are javascript Date objects function dateDiffInDays a  b         Discard the time and time-zone information    const utc1   Date UTC a getFullYear    a getMonth    a getDate       const utc2   Date UTC b getFullYear    b getMonth    b getDate        return Math floor  utc2 - utc1     MS PER DAY         test it const a   new Date  2017-01-01        b   new Date  2017-07-25        difference   dateDiffInDays a  b     This works because UTC time never observes DST  See Does UTC observe daylight saving time   p s  After discussing some of the comments on this answer  once you ve understood the issues with javascript dates that span a DST boundary  there is likely more than just one way to solve it  What I provided above is a simple  and tested  solution  I d be interested to know if there is a simple arithmetic math based solution instead of having to instantiate the two new Date objects  That could potentially be faster

User · Answer

I tried lots of ways  and found that using datepicker was the best  but the date format causes problems with JavaScript      So here s my answer and can be run out of the box    lt input type  text  id  startdate  gt   lt input type  text  id  enddate  gt   lt input type  text  id  days  gt    lt script src  https   code jquery com jquery-1 8 3 js  gt  lt  script gt   lt script src  https   code jquery com ui 1 10 0 jquery-ui js  gt  lt  script gt   lt link rel  stylesheet  href  http   code jquery com ui 1 10 3 themes redmond jquery-ui css    gt   lt script gt    document  ready function           startdate  enddate    datepicker   changeMonth  true  changeYear  true  firstDay  1  dateFormat   dd mm yy            startdate    datepicker   dateFormat   dd-mm-yy           enddate    datepicker   dateFormat   dd-mm-yy           enddate   change function     var start       startdate   datepicker  getDate    var end         enddate   datepicker  getDate     if  start lt end    var days      end - start  1000 60 60 24      days   val days     else   alert   You cant come back before you have been         startdate   val          enddate   val          days   val              end change function       end ready  lt  script gt    a Fiddle can be seen here DEMO

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var date1   new Date  7 11 2010    var date2   new Date  8 11 2010    var diffDays   parseInt  date2 - date1     1000   60   60   24   10     alert diffDays

User · Answer

Here is one way    x000D   x000D  const date1   new Date  7 13 2010    x000D  const date2   new Date  12 15 2010    x000D  const diffTime   Math abs date2 - date1   x000D  const diffDays   Math ceil diffTime    1000   60   60   24     x000D  console log diffTime     milliseconds    x000D  console log diffDays     days    x000D   x000D   x000D    Observe that we need to enclose the date in quotes  The rest of the code gets the time difference in milliseconds and then divides to get the number of days  Date expects mm dd yyyy format

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This is the code to subtract one date from another  This example converts the dates to objects as the getTime   function won t work unless it s an Date object       var dat1   document getElementById  inputDate   value                  var date1   new Date dat1   converts string to date object                 alert date1                   var dat2   document getElementById  inputFinishDate   value                  var date2   new Date dat2                  alert date2                    var oneDay   24   60   60   1000     hours minutes seconds milliseconds                 var diffDays   Math abs  date1 getTime   - date2 getTime       oneDay                    alert diffDays

[javascript] Get difference between 2 dates in JavaScript?

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