Getting the client s time zone and offset in JavaScript

Question

How can I gather the visitor s time zone information  I need both   the time zone  for example  Europe London  and the offset from UTC or GMT  for example  UTC 01

User · Answer

It s already been answered how to get offset in minutes as an integer  but in case anyone wants the local GMT offset as a string e g    1130    function pad number  length       var str        number     while  str length  lt  length            str    0  str           return str    var offset   new Date   getTimezoneOffset   offset     offset lt 0       -       Note the reversed sign            pad parseInt Math abs offset 60    2             pad Math abs offset 60   2

User · Answer

You can use   moment-timezone   lt script src  moment js  gt  lt  script gt   lt script src  moment-timezone-with-data js  gt  lt  script gt      retrieve timezone by name  i e   America Chicago   moment tz guess      Browser time zone detection is rather tricky to get right  as there is little information provided by the browser   Moment Timezone uses Date getTimezoneOffset   and Date toString   on a handful of moments around the current year to gather as much information about the browser environment as possible  It then compares that information with all the time zone data loaded and returns the closest match  In case of ties  the time zone with the city with largest population is returned   console log moment tz guess        America Chicago

User · Answer

JavaScript    x000D   x000D  var d   new Date    x000D  var n   d getTimezoneOffset    x000D  var timezone   n   -60  x000D  console log timezone   x000D   x000D   x000D

User · Answer

Using getTimezoneOffset   You can get the time zone offset in minutes like this   x000D   x000D  var offset   new Date   getTimezoneOffset    console log offset      if offset equals -60 then the time zone offset is UTC 01 x000D   x000D   x000D    The time-zone offset is the difference  in minutes  between UTC and local time  Note that this means that the offset is positive if the local timezone is behind UTC and negative if it is ahead   For example  if your time zone is UTC 10  Australian Eastern Standard Time   -600 will be returned  Daylight savings time prevents this value from being a constant even for a given locale   Mozilla Date Object reference  Note that not all timezones are offset by whole hours  for example  Newfoundland is UTC minus 3h 30m  leaving Daylight Saving Time out of the equation   Please also note that this only gives you the time zone offset  eg  UTC 01   it does not give you the time zone  eg  Europe London

User · Answer

As an alternative to new Date   getTimezoneOffset   and moment   format  zz    you can also use momentjs    x000D   x000D  var offset   moment parseZone Date now    utcOffset     60 x000D  console log offset   x000D   lt script src  https   cdn jsdelivr net momentjs 2 13 0 moment min js  gt  lt  script gt  x000D   x000D   x000D    jstimezone is also quite buggy and unmaintained  https   bitbucket org pellepim jstimezonedetect issues status new amp status open

User · Answer

See this resultant operator was opposite to the Timezone  So apply some math function then validate the num less or more     See the MDN document   x000D   x000D  var a   new Date   getTimezoneOffset    x000D   x000D  var res   -Math round a 60      - a 60   x000D  res   res  lt  0  res       res  x000D   x000D  console log res  x000D   x000D   x000D

User · Answer

You just to to include moment js and jstz js    lt script src  https   cdnjs cloudflare com ajax libs moment js 2 17 1 moment min js  gt  lt  script gt   lt script src  https   cdnjs cloudflare com ajax libs jstimezonedetect 1 0 6 jstz min js  gt  lt  script gt    and after that   lt script gt    function     var currentTimezone   jstz determine     var timezone   currentTimezone name     alert timezone         lt  script gt

User · Answer

Try this   new Date   toString   split  GMT   1  split       0

User · Answer

This value is from user s machine and it can be changed anytime so I think it doesn t matter  I just want to get an approximate value and then convert it to GMT in my server   For example  I am from Taiwan and it returns   8  for me   Working example   JS  function timezone         var offset   new Date   getTimezoneOffset        var minutes   Math abs offset       var hours   Math floor minutes   60       var prefix   offset  lt  0          -       return prefix hours          result   html timezone       HTML   lt div id  result  gt  lt  div gt    Result   8

User · Answer

A one-liner that gives both the offset and the time zone is to simply call toTimeString   on a new Date object  From MDN   The toTimeString   method returns the time portion of a Date object in human readable form in American English   The catch is that the timezone is not in the standard IANA format  it s somewhat more user-friendly  than the  quot continent city quot  IANA format  Try it out   x000D   x000D  console log new Date   toTimeString   slice 9    console log Intl DateTimeFormat   resolvedOptions   timeZone   console log new Date   getTimezoneOffset     -60   x000D   x000D   x000D   In California right now  toTimeString   returns Pacific Daylight Time while the Intl API returns America Los Angeles  In Colombia  you d get Colombia Standard Time  vs  America Bogota  Note that many other answers to this question attempt to obtain the same information by calling Date toString    That approach is not that reliable  as MDN explains   Date instances refer to a specific point in time  Calling toString   will return the date formatted in a human readable form in American English        Sometimes it is desirable to obtain a string of the time portion  such a thing can be accomplished with the toTimeString   method  The toTimeString   method is especially useful because compliant engines implementing ECMA-262 may differ in the string obtained from toString   for Date objects  as the format is implementation-dependent  simple string slicing approaches may not produce consistent results across multiple engines

User · Answer

I wrote a function in my project  which returns the timezone in hh mm format  I hope this may help someone   function getTimeZone         var offset   new Date   getTimezoneOffset    o   Math abs offset       return  offset  lt  0          -       00    Math floor o   60   slice -2            00     o   60   slice -2            Outputs   5 00    x000D   x000D  function getTimeZone     x000D    var offset   new Date   getTimezoneOffset    o   Math abs offset   x000D    return  offset  lt  0          -       00    Math floor o   60   slice -2            00     o   60   slice -2   x000D    x000D   x000D   x000D     See output x000D  document write getTimeZone     x000D   x000D   x000D    Working Fiddle

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If all you need is the  quot MST quot  or the  quot EST quot  time zone abbreviation   x000D   x000D  function getTimeZone        var now   new Date   toString        var timeZone   now replace                    1     extracts the content between parenthesis     return timeZone    console log getTimeZone     x000D   x000D   x000D

User · Answer

This is very good work for me      Translation to offset in Unix Timestamp let timeZoneOffset     new Date   getTimezoneOffset    60  3600

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Use this to convert OffSet to postive   var offset   new Date   getTimezoneOffset    console log offset   this timeOffSet   offset    -2 offset   console log this timeOffSet

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you can simply try this  it will return you current machine time     var  d   new Date      t   0    d   new Date t 1000    d getTime

User · Answer

I realize this answer is a bit off topic but I imagine many of us looking for an answer also wanted to format the time zone for display and perhaps get the zone abbreviation too  So here it goes    If you want the client timezone nicely formatted you can rely on the JavaScript Date toString method and do  var split   new Date   toString   split  quot   quot    var timeZoneFormatted   split split length - 2     quot   quot    split split length - 1    This will give you  quot GMT-0400  EST  quot  for example  including the timezone minutes when applicable  Alternatively  with regex you can extract any desired part  For  quot GMT-0400  EDT  quot    new Date   toString   match    A-Z     -  0-9        1   For  quot GMT-0400 quot    new Date   toString   match    A-Z     -  0-9      1   For just  quot EDT quot    new Date   toString   match      A-Za-z s         1   For just  quot -0400 quot   new Date   toString   match    -    0-9    s   1   Date toString reference  https   developer mozilla org en JavaScript Reference Global Objects Date toString EDIT 10 6 2020 - The above solution may not work in all browsers and locales  My present recommendation is to utilize a library  Some good popular libraries are  moment  date-fns 2  luxon or dayjs

User · Answer

Timezone in hours-   x000D   x000D  var offset   new Date   getTimezoneOffset    x000D  if offset lt 0  x000D      console log   Your timezone is- GMT      offset -60    x000D  else x000D      console log   Your timezone is- GMT-    offset 60   x000D   x000D   x000D    If you want to be precise as you mentioned in comment  then you should try like this-   x000D   x000D  var offset   new Date   getTimezoneOffset    x000D   x000D  if offset lt 0  x000D    x000D      var extraZero       x000D      if -offset 60 lt 10  x000D        extraZero  0   x000D   x000D      console log   Your timezone is- GMT     Math ceil offset -60      extraZero  -offset 60    x000D    x000D  else x000D    x000D      var extraZero       x000D      if offset 60 lt 10  x000D        extraZero  0   x000D   x000D      console log   Your timezone is- GMT-    Math floor offset 60      extraZero  offset 60    x000D    x000D   x000D   x000D

User · Answer

If you just want the timezone  like IST  GMT  etc    then use this  var timezone   new Date   toString   match      A-Za-z s         1   var parts   timezone split       var tz    quot  quot   parts forEach function  element    tz    element substring 0  1

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function getLocalTimeZone         var dd   new Date        var ddStr   dd toString        var ddArr   ddStr split           var tmznSTr   ddArr 5       tmznSTr   tmznSTr substring 3  tmznSTr length       return tmznSTr      Example   Thu Jun 21 2018 18 12 50 GMT 0530  India Standard Time    O P    0530

User · Answer

try getTimezoneOffset   of the Date object   var curdate   new Date   var offset   curdate getTimezoneOffset     This method returns time zone offset in minutes which is the difference between GMT and local time in minutes

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Once I had this  quot simple quot  task and I used  new Date    getTimezoneOffset   - the  approach that is widely suggested here  But it turned out that the solution wasn t quite right  For some undocumented reasons in my case new Date   was returning GMT 0200 when new Date 0  was returning GMT 0300 which was right  Since then I always use  new Date 0   getTimezoneOffset   to get a correct timeshift

User · Answer

With moment js   moment   format  zz

User · Answer

This will do the job     var time   new Date    timestamp   Date 1000   time getTime     console log timestamp       Thu May 25 2017 21 35 14 GMT 0300  IDT    undefined

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With momentjs  you can find current timezone as    x000D   x000D  console log moment   utcOffset         -240  -120  -60  0  60  120  240  etc   x000D   lt script src  https   cdn jsdelivr net momentjs 2 13 0 moment min js  gt  lt  script gt  x000D   x000D   x000D      With dayjs  you can find current timezone as    x000D   x000D  console log dayjs   utcOffset         -240  -120  -60  0  60  120  240  etc   x000D   lt script src  https   unpkg com dayjs 1 8 10 dayjs min js  gt  lt  script gt  x000D   x000D   x000D    Both API returns utc offset in minutes    moment Doc Dayjs Doc

User · Answer

On the new Date   you can get the offset  to get the timezone name you may do   new Date   toString   replace                     2     you get the value between    in the end of the date  that is the name of the timezone

User · Answer

Using an offset to calculate Timezone is a wrong approach  and you will always encounter problems  Time zones and daylight saving rules may change on several occasions during a year  and It s difficult to keep up with changes   To get the system s IANA timezone in JavaScript  you should use     x000D   x000D  console log Intl DateTimeFormat   resolvedOptions   timeZone  x000D   x000D   x000D    As of September 2019  this works in 95  of the browsers used globally   Old compatibility information  ecma-402 1 0 says that timeZone may be undefined if not provided to constructor  However  future draft  3 0  fixed that issue by changing to system default timezone      In this version of the ECMAScript Internationalization API  the   timeZone property will remain undefined if no timeZone property was   provided in the options object provided to the Intl DateTimeFormat   constructor  However  applications should not rely on this  as future   versions may return a String value identifying the host environment   s   current time zone instead    in ecma-402 3 0 which is still in a draft it changed to     In this version of the ECMAScript 2015 Internationalization API  the   timeZone property will be the name of the default time zone if no   timeZone property was provided in the options object provided to the   Intl DateTimeFormat constructor  The previous version left the   timeZone property undefined in this case

User · Answer

This would be my solution     x000D   x000D         For time zone  x000D      const timeZone              exec new Date   toString    1   x000D       x000D         Offset hours  x000D      const offsetHours   new Date   getTimezoneOffset     60  x000D       x000D      console log    timeZone     offsetHours hrs    x000D   x000D   x000D

User · Answer

Try this   new Date   toLocaleString  quot en-US quot  Intl DateTimeFormat   resolvedOptions   timeZone   This will look for timeZone on your client s browser

[javascript] Getting the client's time zone (and offset) in JavaScript

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