Min Max of dates in an array

Question

How can I find out the min and the max date from an array of dates  Currently  I am creating an array like this   var dates       dates push new Date  2011 06 25    dates push new Date  2011 06 26    dates push new Date  2011 06 27    dates push new Date  2011 06 28      Is there a built-in function to do this or am I to write my own

User · Answer

min and   max work on arrays of dates  use those if you re using Lodash or Underscore  and consider using Lodash  which provides many utility functions like these  if you re not already   For example     min       new Date  2015-05-08T00 07 19Z        new Date  2015-04-08T00 07 19Z        new Date  2015-06-08T00 07 19Z        will return the second date in the array  because it is the earliest

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ONELINER   var min  dates sort  a b   gt a-b  0   max  dates slice -1  0     result in variables min and max  complexity O nlogn   editable example here  If your array has no-date values  like null  first clean it by dates dates filter d  gt  d instanceof Date      x000D   x000D  var dates       x000D  dates push new Date  2011-06-25        I change     to  -  in  2011 06 25  x000D  dates push new Date  2011-06-26        because conosle log write dates  x000D  dates push new Date  2011-06-27        using  -   x000D  dates push new Date  2011-06-28     x000D   x000D  var min  dates sort  a b   gt a-b  0   max  dates slice -1  0   x000D   x000D  console log  min max    x000D   x000D   x000D

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Same as apply  now with spread    const maxDate   new Date Math max    dates       could be a comment on best answer

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Use Spread Operators  ES6     let datesVar     2017-10-26T03 37 10 876Z    2017-10-27T03 37 10 876Z    2017-10-23T03 37 10 876Z    2015-10-23T03 37 10 876Z    Math min    datesVar     That will give the minimum date from the array      Its shorthand Math min apply null  ArrayOfdates

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The above answers do not handle blank undefined values to fix this I used the below code and replaced blanks with NA    function getMax dateArray  filler          filler  filler filler           if   dateArray length            return filler                var max             dateArray forEach function date            if  date              var d   new Date date             if  max  amp  amp  d valueOf   gt max valueOf                  max   d              else if   max                max   d                                        return max         console log getMax     NA     console log getMax datesArray  NA     console log getMax datesArray     function getMin dateArray  filler     filler   filler   filler         if   dateArray length        return filler        var min         dateArray forEach function date        if  date          var d   new Date date         if  min  amp  amp  d valueOf    lt  min valueOf              min   d          else if   min            min   d                        return min     console log getMin      NA     console log getMin datesArray   NA     console log getMin datesArray      I have added a plain javascript demo here and used it as a filter with AngularJS in this codepen

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Since dates are converted to UNIX epoch  numbers   you can use Math max min to find those   var maxDate   Math max apply null  dates     convert back to date object maxDate   new Date maxDate     tested in chrome only  but should work in most browsers

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Using Moment  Underscore and jQuery  to iterate an array of dates   Sample JSON    workerList                       shift start dttm    13 06 2017 20 21            shift end dttm    13 06 2017 23 59                    shift start dttm    03 04 2018 00 00            shift end dttm    03 05 2018 00 00                   Javascript   function getMinStartDttm workerList          if    isEmpty workerList             var startDtArr                 each d workerList  function index value                                startDtArr push moment value shift start dttm trim     DD MM YYYY HH mm                                        var startDt     min startDtArr                       return start format  DD MM YYYY HH mm          else           return                  Hope it helps

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Code is tested with IE FF Chrome and works properly   var dates     dates push new Date  2011 06 25    dates push new Date  2011 06 26    dates push new Date  2011 06 27    dates push new Date  2011 06 28    var maxDate new Date Math max apply null dates    var minDate new Date Math min apply null dates

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var max date   dates sort function d1  d2       return d2-d1     0

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This is a particularly great way to do this  you can get max of an array of objects using one of the object properties   Math max apply Math array map function o  return o y      This is the accepted answer for this page  Finding the max value of an attribute in an array of objects

User · Answer

Something like   var min   dates reduce function  a  b    return a  lt  b   a   b       var max   dates reduce function  a  b    return a  gt  b   a   b        Tested on Chrome 15 0 854 0 dev

[javascript] Min/Max of dates in an array?

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