Compare dates with javascript

Question

I have two dates in javascript   var first    2012-11-21   var second    2012-11-03     i would like make    if first  gt  second                 how is the best way for this  without external library

User · Accepted Answer

if   new Date first  getTime    gt  new Date second  getTime           ----------------------------------

User · Answer

you can done this way also   if  dateFormat first   yyyy-mm-dd    gt  dateFormat second   yyyy-mm-dd              console log  done        OR  if  dateFormat first   mm-dd-yyyy    gt   dateFormat second   mm-dd-yyyy              console log  done        i use following plugin for dateFormat            var dateFormat   function              var token    d 1 4  m 1 4  yy   yy     HhMsTt   1   LloSZ                  g              timezone     b    PMCEA  SDP T    Pacific Mountain Central Eastern Atlantic     Standard Daylight Prevailing  Time    GMT UTC     -   d 4     b g              timezoneClip      -  dA-Z  g              pad   function  val  len                    val   String val                   len   len    2                  while  val length  lt  len  val    0    val                  return val                             Regexes and supporting functions are cached through closure         return function  date  mask  utc                var dF   dateFormat                  You can t provide utc if you skip other args  use the  UTC   mask prefix              if  arguments length    1  amp  amp  Object prototype toString call date       object String    amp  amp     d  test date                     mask   date                  date   undefined                                Passing date through Date applies Date parse  if necessary             date   date   new Date date    new Date              if  isNaN date   throw SyntaxError  invalid date                 mask   String dF masks mask     mask    dF masks  default                     Allow setting the utc argument via the mask             if  mask slice 0  4      UTC                      mask   mask slice 4                   utc   true                             var     utc    getUTC     get                   d   date      Date                      D   date      Day                      m   date      Month                      y   date      FullYear                      H   date      Hours                      M   date      Minutes                      s   date      Seconds                      L   date      Milliseconds                      o   utc   0   date getTimezoneOffset                    flags                         d     d                      dd    pad d                       ddd   dF i18n dayNames D                       dddd  dF i18n dayNames D   7                       m     m   1                      mm    pad m   1                       mmm   dF i18n monthNames m                       mmmm  dF i18n monthNames m   12                       yy    String y  slice 2                       yyyy  y                      h     H   12    12                      hh    pad H   12    12                       H     H                      HH    pad H                       M     M                      MM    pad M                       s     s                      ss    pad s                       l     pad L  3                       L     pad L  gt  99   Math round L   10    L                       t     H  lt  12    a      p                       tt    H  lt  12    am     pm                       T     H  lt  12    A      P                       TT    H  lt  12    AM     PM                       Z     utc    UTC     String date  match timezone           pop   replace timezoneClip                           o      o  gt  0    -           pad Math floor Math abs o    60    100   Math abs o    60  4                       S       th    st    nd    rd   d   10  gt  3   0    d   100 - d   10    10    d   10                                  return mask replace token  function   0                    return  0 in flags   flags  0     0 slice 1   0 length - 1                                               Some common format strings     dateFormat masks              default         ddd mmm dd yyyy HH MM ss           shortDate        m d yy           mediumDate       mmm d  yyyy           longDate         mmmm d  yyyy           fullDate         dddd  mmmm d  yyyy           shortTime        h MM TT           mediumTime       h MM ss TT           longTime         h MM ss TT Z           isoDate          yyyy-mm-dd           isoTime          HH MM ss           isoDateTime      yyyy-mm-dd T HH MM ss           isoUtcDateTime   UTC yyyy-mm-dd T HH MM ss Z                  Internationalization strings     dateFormat i18n             dayNames                 Sun    Mon    Tue    Wed    Thu    Fri    Sat                Sunday    Monday    Tuesday    Wednesday    Thursday    Friday    Saturday                     monthNames                 Jan    Feb    Mar    Apr    May    Jun    Jul    Aug    Sep    Oct    Nov    Dec                January    February    March    April    May    June    July    August    September    October    November    December                           For convenience        Date prototype format   function  mask  utc            return dateFormat this  mask  utc

User · Answer

You can do this way  it will work fine   var date1   new Date  2013-07-30    var date2   new Date  2013-07-30     if date1     date2   console log  both are equal        it does not work     gt undefined    result if  date1      date2   console log  both are equal       do it this way      use   prefix for a variable that holds a date value     gt  both are equal   result   Note  -  don t forget to use a   prefix

User · Answer

USe this function for date comparison in javascript       function fn DateCompare DateA  DateB          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      less than       else if  parseFloat msDateA     parseFloat msDateB           return 0      equal       else if  parseFloat msDateA   gt  parseFloat msDateB           return 1      greater than       else         return null      error

User · Answer

If your dates are strings in a strict yyyy-mm-dd format as shown in the question then your code will work as is without converting to date objects or numbers   if first  gt  second        will do a lexographic  i e   alphanumeric  dictionary order   string comparison - which will compare the first characters of each string  then the second characters of each string  etc  Which will give the result you want

User · Answer

Because of your date format  you can use this code   if parseInt first replace  - g     10   gt  parseInt second replace  - g     10                 It will check whether 20121121 number is bigger than 20121103 or not

User · Answer

The best way is   var first    2012-11-21   var second    2012-11-03    if  new Date first   gt  new Date second

[javascript] Compare dates with javascript

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