How Many Seconds Between Two Dates

Question

So I have two dates YYYY-MM-DD and ZZZZ-NN-EE  How can I find out how many seconds there are between them

User · Answer

If one or both of your dates are in the future, then I'm afraid you're SOL if you want to-the-second accuracy. UTC time has leap seconds that aren't known until about 6 months before they happen, so any dates further out than that can be inaccurate by some number of seconds (and in practice, since people don't update their machines that often, you may find that any time in the future is off by some number of seconds).

This gives a good explanation of the theory of designing date/time libraries and why this is so: http://www.boost.org/doc/libs/1_41_0/doc/html/date_time/details.html#date_time.tradeoffs

User · Answer

I m taking YYYY  amp  ZZZZ to mean integer values which mean the year  MM  amp  NN to mean integer values meaning the month of the year and DD  amp  EE as integer values meaning the day of the month    var t1   new Date YYYY  MM  DD  0  0  0  0   var t2   new Date ZZZZ  NN  EE  0  0  0  0   var dif   t1 getTime   - t2 getTime     var Seconds from T1 to T2   dif   1000  var Seconds Between Dates   Math abs Seconds from T1 to T2     A handy source for future reference is the MDN site  Alternatively  if your dates come in a format javascript can parse  var dif   Date parse MM         DD          YYYY  - Date parse NN         EE          ZZZZ     and then you can use that value as the difference in milliseconds  dif in both my examples has the same meaning

User · Answer

In bash   bc  lt  lt  lt     date --date  1 week ago    s  -         date --date  Sun   29 Feb 2004 16 21 42 -0800    s     It does require having bc and gnu date installed

User · Answer

Net provides the TimeSpan class to do the math for you   var time1   new Date YYYY  MM  DD  0  0  0  0  var time2   new Date ZZZZ  NN  EE  0  0  0  0   Dim ts As TimeSpan   time2 Subtract time1   ts TotalSeconds

User · Answer

Just subtract    var a   new Date    alert  Wait a few seconds  then click OK     var b   new Date    var difference    b - a    1000   alert  You waited      difference     seconds

User · Answer

You can do it simply   var secondBetweenTwoDate   Math abs  new Date   getTime   - oldDate getTime      1000

User · Answer

Easy Way   function diff hours dt2  dt1         var diff   dt2 getTime   - dt1 getTime      1000    diff     60   60     return Math abs Math round diff          function diff minutes dt2  dt1         var diff   dt2 getTime   - dt1 getTime      1000    diff     60     return Math abs Math round diff         function diff seconds dt2  dt1         var diff   dt2 getTime   - dt1 getTime      1000    return Math abs Math round diff         function diff miliseconds dt2  dt1         var diff   dt2 getTime   - dt1 getTime       return Math abs Math round diff          dt1   new Date 2014 10 2   dt2   new Date 2014 10 3   console log diff hours dt1  dt2      dt1   new Date  October 13  2014 08 11 00    dt2   new Date  October 14  2014 11 13 00    console log diff hours dt1  dt2     console log diff minutes dt1  dt2     console log diff seconds dt1  dt2     console log diff miliseconds dt1  dt2

User · Answer

create two Date objects and call valueOf   on both  then compare them   JavaScript Date Object Reference

User · Answer

var a   new Date  2010 jan 10        b   new Date  2010 jan 9     alert      a     n         b     n         Difference         a -  b    1000

[javascript] How Many Seconds Between Two Dates?

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