javascript toISOString ignores timezone offset

Question

I am trying to convert Twitter datetime to a local iso-string  for prettyDate  now for 2 days  I m just not getting the local time right    im using the following function   function getLocalISOTime twDate        var d   new Date twDate       var utcd   Date UTC d getFullYear    d getMonth    d getDate    d getHours            d getMinutes    d getSeconds    d getMilliseconds             obtain local UTC offset and convert to msec     localOffset   d getTimezoneOffset     60000      var newdate   new Date utcd   localOffset       return newdate toISOString   replace   000            in newdate everything is ok but the toISOString   throws it back to the original time again    Can anybody help me get the local time in iso from the Twitterdate formatted as  Thu  31 May 2012 08 33 41  0000

User · Answer

It will be very helpful to get current date and time   var date new Date      var today new Date date getTime   -  date getTimezoneOffset     60000   toISOString   replace  T        replace

User · Answer

moment js FTW     Just convert your date to a moment and manipulate it however you please   var d   new Date twDate   var m   moment d  format    console log m      example output     2016-01-08T00 00 00-06 00   http   momentjs com docs

User · Answer

Moment js solution to this is   var d   new Date new Date   setHours 0 0 0 0    m add m utcOffset     m   m toDate   toISOString      output  2019-07-18T00 00 00 000Z

User · Answer

moment js is great but sometimes you don t want to pull a large number of dependencies for simple things   The following works as well   var tzoffset    new Date    getTimezoneOffset     60000    offset in milliseconds var localISOTime    new Date Date now   - tzoffset   toISOString   slice 0  -1        gt   2015-01-26T06 40 36 181    The slice 0  -1  gets rid of the trailing Z which represents Zulu timezone and can be replaced by your own

User · Answer

My solution without using moment is to convert it to a timestamp  add the timezone offset  then convert back to a date object  and then run the toISOString    var date   new Date       Or the date you d like converted  var isoDateTime   new Date date getTime   -  date getTimezoneOffset     60000   toISOString

User · Answer

Using moment js  you can use keepOffset parameter of toISOString   toISOString keepOffset   boolean   string   moment   toISOString true

User · Answer

This date function below achieves the desired effect without an additional script library  Basically it s just a simple date component concatenation in the right format  and augmenting of the Date object s prototype    Date prototype dateToISO8601String    function         var padDigits   function padDigits number  digits            return Array Math max digits - String number  length   1  0   join 0    number            var offsetMinutes   this getTimezoneOffset        var offsetHours   offsetMinutes   60      var offset   Z           if  offsetHours  lt  0        offset    -    padDigits offsetHours replace  -         00  4       else if  offsetHours  gt  0         offset         padDigits offsetHours     00   4        return this getFullYear                   -    padDigits  this getUTCMonth   1  2                  -    padDigits this getUTCDate   2                  T                 padDigits this getUTCHours   2                      padDigits this getUTCMinutes   2                      padDigits this getUTCSeconds   2                      padDigits this getUTCMilliseconds   2                offset      Date dateFromISO8601   function isoDateString          var parts   isoDateString match   d  g         var isoTime   Date UTC parts 0   parts 1  - 1  parts 2   parts 3   parts 4   parts 5          var isoDate   new Date isoTime         return isoDate            function test         var dIn   new Date        var isoDateString   dIn dateToISO8601String        var dOut   Date dateFromISO8601 isoDateString       var dInStr   dIn toUTCString        var dOutStr   dOut toUTCString        console log  Dates are equal       dInStr    dOutStr        Usage   var d   new Date    console log d dateToISO8601String       Hopefully this helps someone else   EDIT   Corrected UTC issue mentioned in comments  and credit to Alex for the dateFromISO8601 function

[javascript] javascript toISOString() ignores timezone offset

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