Create a Date with a set timezone without using a string representation

Question

I have a web page with three dropdowns for day  month and year  If I use the JavaScript Date constructor that takes numbers  then I get a Date object for my current timezone   new Date xiYear  xiMonth  xiDate    Give the correct date  but it thinks that date is GMT 01 00 due to daylight savings time   The problem here is that I then pass this Date to an Ajax method and when the date is deserialised on the server it has been converted to GMT and so lost an hour which moves the day back by one  Now I could just pass the day  month  and year individually into the Ajax method  but it seems that there ought to be a better way   The accepted answer pointed me in the right direction  however just using setUTCHours   by itself changed   Apr 5th 00 00 GMT 01 00    to  Apr 4th 23 00 GMT 01 00   I then also had to set the UTC date  month and year to end up with  Apr 5th 01 00 GMT 01 00   which is what I wanted

User · Answer

const date   new Date  quot 2020-12-16 17 45 00 UTC quot     Works fine

User · Answer

Simply Set the Time Zone and Get Back According  new Date   toLocaleString  en-US    timeZone   America New York         Other Time-zones are as Following   var world timezones          Europe Andorra        Asia Dubai        Asia Kabul        Europe Tirane        Asia Yerevan        Antarctica Casey        Antarctica Davis        Antarctica DumontDUrville         Antarctica Mawson        Antarctica Palmer        Antarctica Rothera        Antarctica Syowa        Antarctica Troll        Antarctica Vostok        America Argentina Buenos Aires        America Argentina Cordoba        America Argentina Salta        America Argentina Jujuy        America Argentina Tucuman        America Argentina Catamarca        America Argentina La Rioja        America Argentina San Juan        America Argentina Mendoza        America Argentina San Luis        America Argentina Rio Gallegos        America Argentina Ushuaia        Pacific Pago Pago        Europe Vienna        Australia Lord Howe        Antarctica Macquarie        Australia Hobart        Australia Currie        Australia Melbourne        Australia Sydney        Australia Broken Hill        Australia Brisbane        Australia Lindeman        Australia Adelaide        Australia Darwin        Australia Perth        Australia Eucla        Asia Baku        America Barbados        Asia Dhaka        Europe Brussels        Europe Sofia        Atlantic Bermuda        Asia Brunei        America La Paz        America Noronha        America Belem        America Fortaleza        America Recife        America Araguaina        America Maceio        America Bahia        America Sao Paulo        America Campo Grande        America Cuiaba        America Santarem        America Porto Velho        America Boa Vista        America Manaus        America Eirunepe        America Rio Branco        America Nassau        Asia Thimphu        Europe Minsk        America Belize        America St Johns        America Halifax        America Glace Bay        America Moncton        America Goose Bay        America Blanc-Sablon        America Toronto        America Nipigon        America Thunder Bay        America Iqaluit        America Pangnirtung        America Atikokan        America Winnipeg        America Rainy River        America Resolute        America Rankin Inlet        America Regina        America Swift Current        America Edmonton        America Cambridge Bay        America Yellowknife        America Inuvik        America Creston        America Dawson Creek        America Fort Nelson        America Vancouver        America Whitehorse        America Dawson        Indian Cocos        Europe Zurich        Africa Abidjan        Pacific Rarotonga        America Santiago        America Punta Arenas        Pacific Easter        Asia Shanghai        Asia Urumqi        America Bogota        America Costa Rica        America Havana        Atlantic Cape Verde        America Curacao        Indian Christmas        Asia Nicosia        Asia Famagusta        Europe Prague        Europe Berlin        Europe Copenhagen        America Santo Domingo        Africa Algiers        America Guayaquil        Pacific Galapagos        Europe Tallinn        Africa Cairo        Africa El Aaiun        Europe Madrid        Africa Ceuta        Atlantic Canary        Europe Helsinki        Pacific Fiji        Atlantic Stanley        Pacific Chuuk        Pacific Pohnpei        Pacific Kosrae        Atlantic Faroe        Europe Paris        Europe London        Asia Tbilisi        America Cayenne        Africa Accra        Europe Gibraltar        America Godthab        America Danmarkshavn        America Scoresbysund        America Thule        Europe Athens        Atlantic South Georgia        America Guatemala        Pacific Guam        Africa Bissau        America Guyana        Asia Hong Kong        America Tegucigalpa        America Port-au-Prince        Europe Budapest        Asia Jakarta        Asia Pontianak        Asia Makassar        Asia Jayapura        Europe Dublin        Asia Jerusalem        Asia Kolkata        Indian Chagos        Asia Baghdad        Asia Tehran        Atlantic Reykjavik        Europe Rome        America Jamaica        Asia Amman        Asia Tokyo        Africa Nairobi        Asia Bishkek        Pacific Tarawa        Pacific Enderbury        Pacific Kiritimati        Asia Pyongyang        Asia Seoul        Asia Almaty        Asia Qyzylorda        Asia Qostanay         Asia Aqtobe        Asia Aqtau        Asia Atyrau        Asia Oral        Asia Beirut        Asia Colombo        Africa Monrovia        Europe Vilnius        Europe Luxembourg        Europe Riga        Africa Tripoli        Africa Casablanca        Europe Monaco        Europe Chisinau        Pacific Majuro        Pacific Kwajalein        Asia Yangon        Asia Ulaanbaatar        Asia Hovd        Asia Choibalsan        Asia Macau        America Martinique        Europe Malta        Indian Mauritius        Indian Maldives        America Mexico City        America Cancun        America Merida        America Monterrey        America Matamoros        America Mazatlan        America Chihuahua        America Ojinaga        America Hermosillo        America Tijuana        America Bahia Banderas        Asia Kuala Lumpur        Asia Kuching        Africa Maputo        Africa Windhoek        Pacific Noumea        Pacific Norfolk        Africa Lagos        America Managua        Europe Amsterdam        Europe Oslo        Asia Kathmandu        Pacific Nauru        Pacific Niue        Pacific Auckland        Pacific Chatham        America Panama        America Lima        Pacific Tahiti        Pacific Marquesas        Pacific Gambier        Pacific Port Moresby        Pacific Bougainville        Asia Manila        Asia Karachi        Europe Warsaw        America Miquelon        Pacific Pitcairn        America Puerto Rico        Asia Gaza        Asia Hebron        Europe Lisbon        Atlantic Madeira        Atlantic Azores        Pacific Palau        America Asuncion        Asia Qatar        Indian Reunion        Europe Bucharest        Europe Belgrade        Europe Kaliningrad        Europe Moscow        Europe Simferopol        Europe Kirov        Europe Astrakhan        Europe Volgograd        Europe Saratov        Europe Ulyanovsk        Europe Samara        Asia Yekaterinburg        Asia Omsk        Asia Novosibirsk        Asia Barnaul        Asia Tomsk        Asia Novokuznetsk        Asia Krasnoyarsk        Asia Irkutsk        Asia Chita        Asia Yakutsk        Asia Khandyga        Asia Vladivostok        Asia Ust-Nera        Asia Magadan        Asia Sakhalin        Asia Srednekolymsk        Asia Kamchatka        Asia Anadyr        Asia Riyadh        Pacific Guadalcanal        Indian Mahe        Africa Khartoum        Europe Stockholm        Asia Singapore        America Paramaribo        Africa Juba        Africa Sao Tome        America El Salvador        Asia Damascus        America Grand Turk        Africa Ndjamena        Indian Kerguelen        Asia Bangkok        Asia Dushanbe        Pacific Fakaofo        Asia Dili        Asia Ashgabat        Africa Tunis        Pacific Tongatapu        Europe Istanbul        America Port of Spain        Pacific Funafuti        Asia Taipei        Europe Kiev        Europe Uzhgorod        Europe Zaporozhye        Pacific Wake        America New York        America Detroit        America Kentucky Louisville        America Kentucky Monticello        America Indiana Indianapolis        America Indiana Vincennes        America Indiana Winamac        America Indiana Marengo        America Indiana Petersburg        America Indiana Vevay        America Chicago        America Indiana Tell City        America Indiana Knox        America Menominee        America North Dakota Center        America North Dakota New Salem        America North Dakota Beulah        America Denver        America Boise        America Phoenix        America Los Angeles        America Anchorage        America Juneau        America Sitka        America Metlakatla        America Yakutat        America Nome        America Adak        Pacific Honolulu        America Montevideo        Asia Samarkand        Asia Tashkent        America Caracas        Asia Ho Chi Minh        Pacific Efate        Pacific Wallis        Pacific Apia        Africa Johannesburg

User · Answer

Simply Set the Time Zone and Get Back According  new Date   toLocaleString  en-US    timeZone   America New York         Other Time-zones are as Following   var world timezones          Europe Andorra        Asia Dubai        Asia Kabul        Europe Tirane        Asia Yerevan        Antarctica Casey        Antarctica Davis        Antarctica DumontDUrville         Antarctica Mawson        Antarctica Palmer        Antarctica Rothera        Antarctica Syowa        Antarctica Troll        Antarctica Vostok        America Argentina Buenos Aires        America Argentina Cordoba        America Argentina Salta        America Argentina Jujuy        America Argentina Tucuman        America Argentina Catamarca        America Argentina La Rioja        America Argentina San Juan        America Argentina Mendoza        America Argentina San Luis        America Argentina Rio Gallegos        America Argentina Ushuaia        Pacific Pago Pago        Europe Vienna        Australia Lord Howe        Antarctica Macquarie        Australia Hobart        Australia Currie        Australia Melbourne        Australia Sydney        Australia Broken Hill        Australia Brisbane        Australia Lindeman        Australia Adelaide        Australia Darwin        Australia Perth        Australia Eucla        Asia Baku        America Barbados        Asia Dhaka        Europe Brussels        Europe Sofia        Atlantic Bermuda        Asia Brunei        America La Paz        America Noronha        America Belem        America Fortaleza        America Recife        America Araguaina        America Maceio        America Bahia        America Sao Paulo        America Campo Grande        America Cuiaba        America Santarem        America Porto Velho        America Boa Vista        America Manaus        America Eirunepe        America Rio Branco        America Nassau        Asia Thimphu        Europe Minsk        America Belize        America St Johns        America Halifax        America Glace Bay        America Moncton        America Goose Bay        America Blanc-Sablon        America Toronto        America Nipigon        America Thunder Bay        America Iqaluit        America Pangnirtung        America Atikokan        America Winnipeg        America Rainy River        America Resolute        America Rankin Inlet        America Regina        America Swift Current        America Edmonton        America Cambridge Bay        America Yellowknife        America Inuvik        America Creston        America Dawson Creek        America Fort Nelson        America Vancouver        America Whitehorse        America Dawson        Indian Cocos        Europe Zurich        Africa Abidjan        Pacific Rarotonga        America Santiago        America Punta Arenas        Pacific Easter        Asia Shanghai        Asia Urumqi        America Bogota        America Costa Rica        America Havana        Atlantic Cape Verde        America Curacao        Indian Christmas        Asia Nicosia        Asia Famagusta        Europe Prague        Europe Berlin        Europe Copenhagen        America Santo Domingo        Africa Algiers        America Guayaquil        Pacific Galapagos        Europe Tallinn        Africa Cairo        Africa El Aaiun        Europe Madrid        Africa Ceuta        Atlantic Canary        Europe Helsinki        Pacific Fiji        Atlantic Stanley        Pacific Chuuk        Pacific Pohnpei        Pacific Kosrae        Atlantic Faroe        Europe Paris        Europe London        Asia Tbilisi        America Cayenne        Africa Accra        Europe Gibraltar        America Godthab        America Danmarkshavn        America Scoresbysund        America Thule        Europe Athens        Atlantic South Georgia        America Guatemala        Pacific Guam        Africa Bissau        America Guyana        Asia Hong Kong        America Tegucigalpa        America Port-au-Prince        Europe Budapest        Asia Jakarta        Asia Pontianak        Asia Makassar        Asia Jayapura        Europe Dublin        Asia Jerusalem        Asia Kolkata        Indian Chagos        Asia Baghdad        Asia Tehran        Atlantic Reykjavik        Europe Rome        America Jamaica        Asia Amman        Asia Tokyo        Africa Nairobi        Asia Bishkek        Pacific Tarawa        Pacific Enderbury        Pacific Kiritimati        Asia Pyongyang        Asia Seoul        Asia Almaty        Asia Qyzylorda        Asia Qostanay         Asia Aqtobe        Asia Aqtau        Asia Atyrau        Asia Oral        Asia Beirut        Asia Colombo        Africa Monrovia        Europe Vilnius        Europe Luxembourg        Europe Riga        Africa Tripoli        Africa Casablanca        Europe Monaco        Europe Chisinau        Pacific Majuro        Pacific Kwajalein        Asia Yangon        Asia Ulaanbaatar        Asia Hovd        Asia Choibalsan        Asia Macau        America Martinique        Europe Malta        Indian Mauritius        Indian Maldives        America Mexico City        America Cancun        America Merida        America Monterrey        America Matamoros        America Mazatlan        America Chihuahua        America Ojinaga        America Hermosillo        America Tijuana        America Bahia Banderas        Asia Kuala Lumpur        Asia Kuching        Africa Maputo        Africa Windhoek        Pacific Noumea        Pacific Norfolk        Africa Lagos        America Managua        Europe Amsterdam        Europe Oslo        Asia Kathmandu        Pacific Nauru        Pacific Niue        Pacific Auckland        Pacific Chatham        America Panama        America Lima        Pacific Tahiti        Pacific Marquesas        Pacific Gambier        Pacific Port Moresby        Pacific Bougainville        Asia Manila        Asia Karachi        Europe Warsaw        America Miquelon        Pacific Pitcairn        America Puerto Rico        Asia Gaza        Asia Hebron        Europe Lisbon        Atlantic Madeira        Atlantic Azores        Pacific Palau        America Asuncion        Asia Qatar        Indian Reunion        Europe Bucharest        Europe Belgrade        Europe Kaliningrad        Europe Moscow        Europe Simferopol        Europe Kirov        Europe Astrakhan        Europe Volgograd        Europe Saratov        Europe Ulyanovsk        Europe Samara        Asia Yekaterinburg        Asia Omsk        Asia Novosibirsk        Asia Barnaul        Asia Tomsk        Asia Novokuznetsk        Asia Krasnoyarsk        Asia Irkutsk        Asia Chita        Asia Yakutsk        Asia Khandyga        Asia Vladivostok        Asia Ust-Nera        Asia Magadan        Asia Sakhalin        Asia Srednekolymsk        Asia Kamchatka        Asia Anadyr        Asia Riyadh        Pacific Guadalcanal        Indian Mahe        Africa Khartoum        Europe Stockholm        Asia Singapore        America Paramaribo        Africa Juba        Africa Sao Tome        America El Salvador        Asia Damascus        America Grand Turk        Africa Ndjamena        Indian Kerguelen        Asia Bangkok        Asia Dushanbe        Pacific Fakaofo        Asia Dili        Asia Ashgabat        Africa Tunis        Pacific Tongatapu        Europe Istanbul        America Port of Spain        Pacific Funafuti        Asia Taipei        Europe Kiev        Europe Uzhgorod        Europe Zaporozhye        Pacific Wake        America New York        America Detroit        America Kentucky Louisville        America Kentucky Monticello        America Indiana Indianapolis        America Indiana Vincennes        America Indiana Winamac        America Indiana Marengo        America Indiana Petersburg        America Indiana Vevay        America Chicago        America Indiana Tell City        America Indiana Knox        America Menominee        America North Dakota Center        America North Dakota New Salem        America North Dakota Beulah        America Denver        America Boise        America Phoenix        America Los Angeles        America Anchorage        America Juneau        America Sitka        America Metlakatla        America Yakutat        America Nome        America Adak        Pacific Honolulu        America Montevideo        Asia Samarkand        Asia Tashkent        America Caracas        Asia Ho Chi Minh        Pacific Efate        Pacific Wallis        Pacific Apia        Africa Johannesburg

User · Answer

I believe you need the createDateAsUTC function  please compare with convertDateToUTC   function createDateAsUTC date        return new Date Date UTC date getFullYear    date getMonth    date getDate    date getHours    date getMinutes    date getSeconds         function convertDateToUTC date         return new Date date getUTCFullYear    date getUTCMonth    date getUTCDate    date getUTCHours    date getUTCMinutes    date getUTCSeconds

User · Answer

The easiest way that I have found to get the correct date is using datejs    http   www datejs com   I get my dates via Ajax in this format as a string   2016-01-12T00 00 00   var yourDateString    2016-01-12T00 00 00   var yourDate   new Date yourDateString   console log yourDate   if  yourDate getTimezoneOffset    gt  0       yourDate   new Date yourDateString  addMinutes yourDate getTimezoneOffset       console log yourDate     Console will read   Mon Jan 11 2016 19 00 00 GMT-0500  Eastern Standard Time   Tue Jan 12 2016 00 00 00 GMT-0500  Eastern Standard Time   https   jsfiddle net vp1ena7b 3   The  addMinutes  comes from datejs  you could probably do this in pure js on your own  but I already had datejs in my project so I found a way to use it to get the correct dates    I thought that this might help someone

User · Answer

My clock 2018-07-25  00 26 00  GMT 7  let date   new Date       2018-07-24 17 26 00  Look like GMT 0  const myTimeZone   7     my timeZone     my timeZone   7h   7   60   60   1000  millisecond      2018-07-24 17 26 00   x  milliseconds     finally  time in milliseconds  GMT 7    x   myTimezone  date setTime  date getTime     myTimeZone   60   60   1000       date toISOString     2018-07-25  00 26 00  GMT 7

User · Answer

using  setUTCHours   it would be possible to actually set dates in UTC-time  which would allow you to use UTC-times throughout the system   You cannot set it using UTC in the constructor though  unless you specify a date-string   Using new Date Date UTC year  month  day  hour  minute  second   you can create a Date-object from a specific UTC time

User · Answer

GMT -03 00 Example  new Date new Date  -3600 1000 3  toISOString        2020-02-27T15 03 26 261Z   Or even  now    new Date   getTime  -3600 1000 3     1582818380528 data   new Date now  toISOString            2020-02-27T15 03 26 261Z

User · Answer

I don t believe this is possible - there is no ability to set the timezone on a Date object after it is created   And in a way this makes sense - conceptually  if perhaps not in implementation   per http   en wikipedia org wiki Unix timestamp  emphasis mine       Unix time  or POSIX time  is a system for describing instants in time  defined as the number of seconds elapsed since midnight Coordinated Universal Time  UTC  of Thursday  January 1  1970    Once you ve constructed one it will represent a certain point in  real  time   The time zone is only relevant when you want to convert that abstract time point into a human-readable string   Thus it makes sense you would only be able to change the actual time the Date represents in the constructor   Sadly it seems that there is no way to pass in an explicit timezone - and the constructor you are calling  arguably correctly  translates your  local  time variables into GMT when it stores them canonically - so there is no way to use the int  int  int constructor for GMT times   On the plus side  it s trivial to just use the constructor that takes a String instead   You don t even have to convert the numeric month into a String  on Firefox at least   so I was hoping a naive implementation would work   However  after trying it out it works successfully in Firefox  Chrome  and Opera but fails in Konqueror   Invalid Date     Safari   Invalid Date   and IE   NaN     I suppose you d just have a lookup array to convert the month to a string  like so   var months          January    February         December     function createGMTDate xiYear  xiMonth  xiDate       return new Date months xiMonth          xiDate          xiYear     00 00 00 GMT

User · Answer

If you want to deal with the slightly different  but related  problem of creating a Javascript Date object from year  month  day       including timezone     that is  if you want to parse a string into a Date     then you apparently have to do an infuriatingly complicated dance      parseISO8601String   string - gt  Date    Parse an ISO-8601 date  including possible timezone     into a Javascript Date object        Test strings  parseISO8601String x  toISOString       2013-01-31T12 34               - gt   2013-01-31T12 34 00 000Z      2013-01-31T12 34 56            - gt   2013-01-31T12 34 56 000Z      2013-01-31T12 34 56 78         - gt   2013-01-31T12 34 56 780Z      2013-01-31T12 34 56 78 0100    - gt   2013-01-31T11 34 56 780Z      2013-01-31T12 34 56 78 0530    - gt   2013-01-31T07 04 56 780Z      2013-01-31T12 34 56 78-0330    - gt   2013-01-31T16 04 56 780Z      2013-01-31T12 34 56-0330       - gt   2013-01-31T16 04 56 000Z      2013-01-31T12 34 56Z           - gt   2013-01-31T12 34 56 000Z  function parseISO8601String dateString        var timebits       0-9  4  -  0-9  2  -  0-9  2  T  0-9  2     0-9  2        0-9       0-9            -    0-9  2    0-9  2           var m   timebits exec dateString       var resultDate      if  m            var utcdate   Date UTC parseInt m 1                                   parseInt m 2  -1     months are zero-offset                                    parseInt m 3                                   parseInt m 4    parseInt m 5       hh mm                                 m 6   amp  amp  parseInt m 6      0       optional seconds                                 m 7   amp  amp  parseFloat m 7   1000     0      optional fraction            utcdate is milliseconds since the epoch         if  m 9   amp  amp  m 10                 var offsetMinutes   parseInt m 9     60   parseInt m 10                utcdate     m 8            -1    1    offsetMinutes   60000                    resultDate   new Date utcdate         else           resultDate   null            return resultDate      That is  you create a  UTC time  using the date without timezone  so you know what locale it s in  namely the UTC  locale   and it s not defaulted to the local one   and then manually apply the indicated timezone offset   Wouldn t it have been nice if someone had actually thought about the Javascript date object for more than  oooh  five minutes

User · Answer

I was having a similar problem with a date picker   My research led to a very simple solution  without any extra libraries or hardcoded multipliers  Key info   ISO is the Javascript preferred date standard   Assume date utilities will likely return date values in that format   My date picker displays the date in a localized format  mm dd yyyy  However  it returns the date value in the ISO format    yyyy-mm-dd   Select  quot 08 12 2020 quot  in Date Picker date input   var input       date input   val       input  2020-08-12       Date getTimezoneOffset   returns the offset in minutes   Examples  If you use the default returned date value without modifying the string format  the Date might not get set to your timezone   This can lead to unexpected results  var input       date input   val       input  2020-08-12 var date   new Date input              This get interpreted as an ISO date  already in UTC   date                              Tue Aug 11 2020 20 00 00 GMT-0400  Eastern Daylight Time    date toUTCString                  Wed  12 Aug 2020 00 00 00 GMT   date toLocaleDateString  en-US          8 11 2020  Using a different date string format than the ISO standard yyyy-mm-dd applies your timezone to the Date  var date   new Date  quot 08 12 2020 quot       This gets interpreted as local timezone   date                              Wed Aug 12 2020 00 00 00 GMT-0400  Eastern Daylight Time    date toUTCString                  Wed  12 Aug 2020 04 00 00 GMT   date toLocaleDateString  en-US          8 12 2020  Solution  To apply your timezone to the format-agnostic Date without doing string manipulation  use Date getTimezoneOffset   with Minutes   This works with either original date string format  i e  UTC dates or localized dates    It provides a consistent result which can then be converted accurately to UTC for storage or interacting with other code  var input       date input   val    var date   new Date input   date setMinutes date getMinutes     date getTimezoneOffset       date                              Wed Aug 12 2020 00 00 00 GMT-0400  Eastern Daylight Time    date toUTCString                  Wed  12 Aug 2020 04 00 00 GMT   date toLocaleDateString  en-US          8 12 2020

User · Answer

I used the timezone-js package   var timezoneJS    require  timezone-js    var tzdata   require  tzdata     createDate dateObj        if   dateObj    null             return null            var nativeTimezoneOffset   new Date   getTimezoneOffset        var offset   this getTimeZoneOffset            use the native Date object if the timezone matches     if   offset    -1   nativeTimezoneOffset             return dateObj             this loadTimeZones            FIXME  it would be better if timezoneJS Date was an instanceof of Date               tried jquery   extend               added hack to Fiterpickr to look for Dater getTime instead of  d instanceof Date      return new timezoneJS Date dateObj this getTimeZoneName

User · Answer

You can use library to help to change time zone moment-timezone var moment   require  quot moment-timezone quot    const today   new Date    var timeGet   moment today   timeGet tz  quot Asia Karachi quot   format  quot ha z quot      this can change your time zone of your region paste your region area and get real gmt  resolve issue

User · Answer

This code will return your Date object formatted with the browser timezone   Date prototype timezone   function          this setHours this getHours      new Date   getTimezoneOffset     60        return this      Edit   To avoid to pollute the Date API  the above function can be transformed into a utility function  The function takes a Date object  and returns a mutated Date object   function setTimeZone date        date setHours date getHours      new Date   getTimezoneOffset     60        return date

User · Answer

I used the timezone-js package   var timezoneJS    require  timezone-js    var tzdata   require  tzdata     createDate dateObj        if   dateObj    null             return null            var nativeTimezoneOffset   new Date   getTimezoneOffset        var offset   this getTimeZoneOffset            use the native Date object if the timezone matches     if   offset    -1   nativeTimezoneOffset             return dateObj             this loadTimeZones            FIXME  it would be better if timezoneJS Date was an instanceof of Date               tried jquery   extend               added hack to Fiterpickr to look for Dater getTime instead of  d instanceof Date      return new timezoneJS Date dateObj this getTimeZoneName

User · Answer

I believe you need the createDateAsUTC function  please compare with convertDateToUTC   function createDateAsUTC date        return new Date Date UTC date getFullYear    date getMonth    date getDate    date getHours    date getMinutes    date getSeconds         function convertDateToUTC date         return new Date date getUTCFullYear    date getUTCMonth    date getUTCDate    date getUTCHours    date getUTCMinutes    date getUTCSeconds

User · Answer

This code will return your Date object formatted with the browser timezone   Date prototype timezone   function          this setHours this getHours      new Date   getTimezoneOffset     60        return this      Edit   To avoid to pollute the Date API  the above function can be transformed into a utility function  The function takes a Date object  and returns a mutated Date object   function setTimeZone date        date setHours date getHours      new Date   getTimezoneOffset     60        return date

User · Answer

getTimeZoneOffset is minus for UTC   z    var d   new Date xiYear  xiMonth  xiDate   if d getTimezoneOffset    gt  0       d setTime  d getTime     d getTimezoneOffset   60 1000

User · Answer

I was having a similar problem with a date picker   My research led to a very simple solution  without any extra libraries or hardcoded multipliers  Key info   ISO is the Javascript preferred date standard   Assume date utilities will likely return date values in that format   My date picker displays the date in a localized format  mm dd yyyy  However  it returns the date value in the ISO format    yyyy-mm-dd   Select  quot 08 12 2020 quot  in Date Picker date input   var input       date input   val       input  2020-08-12       Date getTimezoneOffset   returns the offset in minutes   Examples  If you use the default returned date value without modifying the string format  the Date might not get set to your timezone   This can lead to unexpected results  var input       date input   val       input  2020-08-12 var date   new Date input              This get interpreted as an ISO date  already in UTC   date                              Tue Aug 11 2020 20 00 00 GMT-0400  Eastern Daylight Time    date toUTCString                  Wed  12 Aug 2020 00 00 00 GMT   date toLocaleDateString  en-US          8 11 2020  Using a different date string format than the ISO standard yyyy-mm-dd applies your timezone to the Date  var date   new Date  quot 08 12 2020 quot       This gets interpreted as local timezone   date                              Wed Aug 12 2020 00 00 00 GMT-0400  Eastern Daylight Time    date toUTCString                  Wed  12 Aug 2020 04 00 00 GMT   date toLocaleDateString  en-US          8 12 2020  Solution  To apply your timezone to the format-agnostic Date without doing string manipulation  use Date getTimezoneOffset   with Minutes   This works with either original date string format  i e  UTC dates or localized dates    It provides a consistent result which can then be converted accurately to UTC for storage or interacting with other code  var input       date input   val    var date   new Date input   date setMinutes date getMinutes     date getTimezoneOffset       date                              Wed Aug 12 2020 00 00 00 GMT-0400  Eastern Daylight Time    date toUTCString                  Wed  12 Aug 2020 04 00 00 GMT   date toLocaleDateString  en-US          8 12 2020

User · Answer

You can use library to help to change time zone moment-timezone var moment   require  quot moment-timezone quot    const today   new Date    var timeGet   moment today   timeGet tz  quot Asia Karachi quot   format  quot ha z quot      this can change your time zone of your region paste your region area and get real gmt  resolve issue

User · Answer

Best Solution I have seen from this came from   http   www codingforums com archive index php t-19663 html  Print Time Function   lt script language  javascript  type  text javascript  gt    borrowed from echoecho   http   www echoecho com ubb viewthread php tid 2362 amp pid 10482 amp  pid10482 workDate   new Date   UTCDate   new Date   UTCDate setTime workDate getTime   workDate getTimezoneOffset   60000   function printTime offset        offset        tempDate   new Date       tempDate setTime UTCDate getTime   3600000  offset       timeValue     tempDate getHours   lt 10      0  tempDate getHours          tempDate getHours         timeValue      tempDate getMinutes   lt 10      0  tempDate getMinutes      tempDate getMinutes        timeValue      hrs       return timeValue           var now   new Date       var seed   now getTime     0xfffffff     var same   rand 12   lt  script gt   Banff  Canada   lt script language  JavaScript  gt document write printTime  -7    lt  script gt    Full Code Example   lt html gt    lt head gt   lt script language  javascript  type  text javascript  gt    borrowed from echoecho   http   www echoecho com ubb viewthread php tid 2362 amp pid 10482 amp  pid10482 workDate   new Date   UTCDate   new Date   UTCDate setTime workDate getTime   workDate getTimezoneOffset   60000   function printTime offset    offset    tempDate   new Date   tempDate setTime UTCDate getTime   3600000  offset   timeValue     tempDate getHours   lt 10      0  tempDate getHours          tempDate getHours     timeValue      tempDate getMinutes   lt 10      0  tempDate getMinutes      tempDate getMinutes    timeValue      hrs   return timeValue   var now   new Date   var seed   now getTime     0xfffffff var same   rand 12   lt  script gt    lt  head gt    lt body gt  Banff  Canada   lt script language  JavaScript  gt document write printTime  -7    lt  script gt   lt br gt  Michigan   lt script language  JavaScript  gt document write printTime  -5    lt  script gt   lt br gt  Greenwich  England UTC    lt script language  JavaScript  gt document write printTime  -0    lt  script gt   lt br gt  Tokyo  Japan   lt script language  JavaScript  gt document write printTime   9    lt  script gt   lt br gt  Berlin  Germany   lt script language  JavaScript  gt document write printTime   1    lt  script gt    lt  body gt   lt  html gt

User · Answer

using  setUTCHours   it would be possible to actually set dates in UTC-time  which would allow you to use UTC-times throughout the system   You cannot set it using UTC in the constructor though  unless you specify a date-string   Using new Date Date UTC year  month  day  hour  minute  second   you can create a Date-object from a specific UTC time

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This is BEST solution  Using      TO ALL dates Date timezoneOffset -240      4 UTC     Override offset only for THIS date new Date   timezoneOffset -180      3 UTC   Code   Date prototype timezoneOffset   new Date   getTimezoneOffset     Date setTimezoneOffset   function timezoneOffset      return this prototype timezoneOffset   timezoneOffset      Date getTimezoneOffset   function       return this prototype timezoneOffset      Date prototype setTimezoneOffset   function timezoneOffset      return this timezoneOffset   timezoneOffset      Date prototype getTimezoneOffset   function       return this timezoneOffset      Date prototype toString   function       var offsetDate  offsetTime    offsetTime   this timezoneOffset   60   1000    offsetDate   new Date this getTime   - offsetTime     return offsetDate toUTCString          Milliseconds    Seconds    Minutes    Hours    Date    Month    FullYear    Year    Day   forEach  function  this      return function key        Date prototype  get    key    function           var offsetDate  offsetTime        offsetTime   this timezoneOffset   60   1000        offsetDate   new Date this getTime   - offsetTime         return offsetDate  getUTC    key                return Date prototype  set    key    function value          var offsetDate  offsetTime  time        offsetTime   this timezoneOffset   60   1000        offsetDate   new Date this getTime   - offsetTime         offsetDate  setUTC    key  value         time   offsetDate getTime     offsetTime        this setTime time         return time                 this      Coffee version   Date prototype timezoneOffset   new Date   getTimezoneOffset     Date setTimezoneOffset    timezoneOffset - gt      return  prototype timezoneOffset   timezoneOffset   Date getTimezoneOffset   - gt      return  prototype timezoneOffset   Date prototype setTimezoneOffset    timezoneOffset - gt      return  timezoneOffset   timezoneOffset   Date prototype getTimezoneOffset   - gt      return  timezoneOffset   Date prototype toString   - gt      offsetTime    timezoneOffset   60   1000     offsetDate   new Date  getTime   - offsetTime      return offsetDate toUTCString            Milliseconds    Seconds    Minutes    Hours        Date    Month    FullYear    Year    Day     forEach  key   gt      Date prototype  get  key      - gt          offsetTime    timezoneOffset   60   1000         offsetDate   new Date  getTime   - offsetTime          return offsetDate  getUTC  key           Date prototype  set  key       value - gt          offsetTime    timezoneOffset   60   1000         offsetDate   new Date  getTime   - offsetTime          offsetDate  setUTC  key    value          time   offsetDate getTime     offsetTime          setTime time          return time

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var d   new Date xiYear  xiMonth  xiDate   d setTime  d getTime     d getTimezoneOffset   60 1000      This answer is tailored specifically to the original question  and will not give the answer you necessarily expect  In particular  some people will want to subtract the timezone offset instead of add it  Remember though that the whole point of this solution is to hack javascript s date object for a particular deserialization  not to be correct in all cases

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const date   new Date  quot 2020-12-16 17 45 00 UTC quot     Works fine

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I don t believe this is possible - there is no ability to set the timezone on a Date object after it is created   And in a way this makes sense - conceptually  if perhaps not in implementation   per http   en wikipedia org wiki Unix timestamp  emphasis mine       Unix time  or POSIX time  is a system for describing instants in time  defined as the number of seconds elapsed since midnight Coordinated Universal Time  UTC  of Thursday  January 1  1970    Once you ve constructed one it will represent a certain point in  real  time   The time zone is only relevant when you want to convert that abstract time point into a human-readable string   Thus it makes sense you would only be able to change the actual time the Date represents in the constructor   Sadly it seems that there is no way to pass in an explicit timezone - and the constructor you are calling  arguably correctly  translates your  local  time variables into GMT when it stores them canonically - so there is no way to use the int  int  int constructor for GMT times   On the plus side  it s trivial to just use the constructor that takes a String instead   You don t even have to convert the numeric month into a String  on Firefox at least   so I was hoping a naive implementation would work   However  after trying it out it works successfully in Firefox  Chrome  and Opera but fails in Konqueror   Invalid Date     Safari   Invalid Date   and IE   NaN     I suppose you d just have a lookup array to convert the month to a string  like so   var months          January    February         December     function createGMTDate xiYear  xiMonth  xiDate       return new Date months xiMonth          xiDate          xiYear     00 00 00 GMT

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When I create a date object  new Date year  month  day  hour  minute  I works fine on localhost  When I deploy to server it breaks  because server is in another timezone  I can t use getTimezoneOffset    I need the timezoneOffset of my home - dependent on summertime wintertime    add diff minutes between myself  HOME  and server  timezoneHomeOffset  d  tz    Europe Copenhagen       const utc   new Date d getTime      const dHome   new Date d toLocaleString  en-US     timeZone  tz       const diff   Math round  utc - dHome    60000     60 1000   gt  minutes   d setMinutes d getMinutes     diff    return d

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Best Solution I have seen from this came from   http   www codingforums com archive index php t-19663 html  Print Time Function   lt script language  javascript  type  text javascript  gt    borrowed from echoecho   http   www echoecho com ubb viewthread php tid 2362 amp pid 10482 amp  pid10482 workDate   new Date   UTCDate   new Date   UTCDate setTime workDate getTime   workDate getTimezoneOffset   60000   function printTime offset        offset        tempDate   new Date       tempDate setTime UTCDate getTime   3600000  offset       timeValue     tempDate getHours   lt 10      0  tempDate getHours          tempDate getHours         timeValue      tempDate getMinutes   lt 10      0  tempDate getMinutes      tempDate getMinutes        timeValue      hrs       return timeValue           var now   new Date       var seed   now getTime     0xfffffff     var same   rand 12   lt  script gt   Banff  Canada   lt script language  JavaScript  gt document write printTime  -7    lt  script gt    Full Code Example   lt html gt    lt head gt   lt script language  javascript  type  text javascript  gt    borrowed from echoecho   http   www echoecho com ubb viewthread php tid 2362 amp pid 10482 amp  pid10482 workDate   new Date   UTCDate   new Date   UTCDate setTime workDate getTime   workDate getTimezoneOffset   60000   function printTime offset    offset    tempDate   new Date   tempDate setTime UTCDate getTime   3600000  offset   timeValue     tempDate getHours   lt 10      0  tempDate getHours          tempDate getHours     timeValue      tempDate getMinutes   lt 10      0  tempDate getMinutes      tempDate getMinutes    timeValue      hrs   return timeValue   var now   new Date   var seed   now getTime     0xfffffff var same   rand 12   lt  script gt    lt  head gt    lt body gt  Banff  Canada   lt script language  JavaScript  gt document write printTime  -7    lt  script gt   lt br gt  Michigan   lt script language  JavaScript  gt document write printTime  -5    lt  script gt   lt br gt  Greenwich  England UTC    lt script language  JavaScript  gt document write printTime  -0    lt  script gt   lt br gt  Tokyo  Japan   lt script language  JavaScript  gt document write printTime   9    lt  script gt   lt br gt  Berlin  Germany   lt script language  JavaScript  gt document write printTime   1    lt  script gt    lt  body gt   lt  html gt

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I don t believe this is possible - there is no ability to set the timezone on a Date object after it is created   And in a way this makes sense - conceptually  if perhaps not in implementation   per http   en wikipedia org wiki Unix timestamp  emphasis mine       Unix time  or POSIX time  is a system for describing instants in time  defined as the number of seconds elapsed since midnight Coordinated Universal Time  UTC  of Thursday  January 1  1970    Once you ve constructed one it will represent a certain point in  real  time   The time zone is only relevant when you want to convert that abstract time point into a human-readable string   Thus it makes sense you would only be able to change the actual time the Date represents in the constructor   Sadly it seems that there is no way to pass in an explicit timezone - and the constructor you are calling  arguably correctly  translates your  local  time variables into GMT when it stores them canonically - so there is no way to use the int  int  int constructor for GMT times   On the plus side  it s trivial to just use the constructor that takes a String instead   You don t even have to convert the numeric month into a String  on Firefox at least   so I was hoping a naive implementation would work   However  after trying it out it works successfully in Firefox  Chrome  and Opera but fails in Konqueror   Invalid Date     Safari   Invalid Date   and IE   NaN     I suppose you d just have a lookup array to convert the month to a string  like so   var months          January    February         December     function createGMTDate xiYear  xiMonth  xiDate       return new Date months xiMonth          xiDate          xiYear     00 00 00 GMT

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var d   new Date xiYear  xiMonth  xiDate   d setTime  d getTime     d getTimezoneOffset   60 1000      This answer is tailored specifically to the original question  and will not give the answer you necessarily expect  In particular  some people will want to subtract the timezone offset instead of add it  Remember though that the whole point of this solution is to hack javascript s date object for a particular deserialization  not to be correct in all cases

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getTimeZoneOffset is minus for UTC   z    var d   new Date xiYear  xiMonth  xiDate   if d getTimezoneOffset    gt  0       d setTime  d getTime     d getTimezoneOffset   60 1000

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any mileage in   var d   new Date xiYear  xiMonth  xiDate  toLocaleString

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GMT -03 00 Example  new Date new Date  -3600 1000 3  toISOString        2020-02-27T15 03 26 261Z   Or even  now    new Date   getTime  -3600 1000 3     1582818380528 data   new Date now  toISOString            2020-02-27T15 03 26 261Z

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I don t believe this is possible - there is no ability to set the timezone on a Date object after it is created   And in a way this makes sense - conceptually  if perhaps not in implementation   per http   en wikipedia org wiki Unix timestamp  emphasis mine       Unix time  or POSIX time  is a system for describing instants in time  defined as the number of seconds elapsed since midnight Coordinated Universal Time  UTC  of Thursday  January 1  1970    Once you ve constructed one it will represent a certain point in  real  time   The time zone is only relevant when you want to convert that abstract time point into a human-readable string   Thus it makes sense you would only be able to change the actual time the Date represents in the constructor   Sadly it seems that there is no way to pass in an explicit timezone - and the constructor you are calling  arguably correctly  translates your  local  time variables into GMT when it stores them canonically - so there is no way to use the int  int  int constructor for GMT times   On the plus side  it s trivial to just use the constructor that takes a String instead   You don t even have to convert the numeric month into a String  on Firefox at least   so I was hoping a naive implementation would work   However  after trying it out it works successfully in Firefox  Chrome  and Opera but fails in Konqueror   Invalid Date     Safari   Invalid Date   and IE   NaN     I suppose you d just have a lookup array to convert the month to a string  like so   var months          January    February         December     function createGMTDate xiYear  xiMonth  xiDate       return new Date months xiMonth          xiDate          xiYear     00 00 00 GMT

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My clock 2018-07-25  00 26 00  GMT 7  let date   new Date       2018-07-24 17 26 00  Look like GMT 0  const myTimeZone   7     my timeZone     my timeZone   7h   7   60   60   1000  millisecond      2018-07-24 17 26 00   x  milliseconds     finally  time in milliseconds  GMT 7    x   myTimezone  date setTime  date getTime     myTimeZone   60   60   1000       date toISOString     2018-07-25  00 26 00  GMT 7

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The easiest way that I have found to get the correct date is using datejs    http   www datejs com   I get my dates via Ajax in this format as a string   2016-01-12T00 00 00   var yourDateString    2016-01-12T00 00 00   var yourDate   new Date yourDateString   console log yourDate   if  yourDate getTimezoneOffset    gt  0       yourDate   new Date yourDateString  addMinutes yourDate getTimezoneOffset       console log yourDate     Console will read   Mon Jan 11 2016 19 00 00 GMT-0500  Eastern Standard Time   Tue Jan 12 2016 00 00 00 GMT-0500  Eastern Standard Time   https   jsfiddle net vp1ena7b 3   The  addMinutes  comes from datejs  you could probably do this in pure js on your own  but I already had datejs in my project so I found a way to use it to get the correct dates    I thought that this might help someone

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This worked for me  Not sure if it is a good idea though    x000D   x000D  var myDate   new Date    x000D  console log  myDate    myDate        myDate   2018-04-04T01 09 38 112Z  x000D   x000D  var offset     5       e g  if the timeZone is -5 x000D   x000D  var MyDateWithOffset   new Date  myDate toGMTString     offset       x000D   x000D  console log  MyDateWithOffset    MyDateWithOffset      myDateWithOffset   2018-04-03T20 09 38 000Z  x000D   x000D   x000D

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using  setUTCHours   it would be possible to actually set dates in UTC-time  which would allow you to use UTC-times throughout the system   You cannot set it using UTC in the constructor though  unless you specify a date-string   Using new Date Date UTC year  month  day  hour  minute  second   you can create a Date-object from a specific UTC time

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This worked for me  Not sure if it is a good idea though    x000D   x000D  var myDate   new Date    x000D  console log  myDate    myDate        myDate   2018-04-04T01 09 38 112Z  x000D   x000D  var offset     5       e g  if the timeZone is -5 x000D   x000D  var MyDateWithOffset   new Date  myDate toGMTString     offset       x000D   x000D  console log  MyDateWithOffset    MyDateWithOffset      myDateWithOffset   2018-04-03T20 09 38 000Z  x000D   x000D   x000D

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I know this is old but if it helps you could use moment and moment time zone   If you haven t seen them take a look     http   momentjs com timezone   http   momentjs com   two really handy time manipulation libraries

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This may help someone  put UTC at the end of what you pass in to the new constructor  At least in chrome you can say var date   new Date  2014-01-01 11 00 00 UTC

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if you want to check the difference in a time between two dates  you can simply check if second timezone is lesser or greater from your first desired timezone and subtract or add a time     const currTimezone   new Date   getTimezoneOffset       your timezone   const newDateTimezone   date getTimezoneOffset       date with unknown timezone    if  currTimezone     newDateTimezone           and below you are checking if difference should be - or    It depends on if unknown timezone is lesser or greater than yours     const newTimezone    currTimezone - newDateTimezone     currTimezone  gt  newDateTimezone   1   -1       date setTime date getTime      newTimezone   60   1000

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I know this is old but if it helps you could use moment and moment time zone   If you haven t seen them take a look     http   momentjs com timezone   http   momentjs com   two really handy time manipulation libraries

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One line solution   new Date new Date 1422524805305  getTime   - 330 60 1000    Instead of 1422524805305  use the timestamp in milliseconds Instead of 330  use your timezone offset in minutes wrt  GMT  eg India  5 30 is 5 60 30   330 minutes

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d   new Date    utc   d getTime      d getTimezoneOffset     60000   nd   new Date utc    3600000 offset     offset value base on which location time zone you would like to set  For India offset value  5 5  New York offset value -4  London offset value  1   for all location offset Wiki List of UTC time offsets

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When I create a date object  new Date year  month  day  hour  minute  I works fine on localhost  When I deploy to server it breaks  because server is in another timezone  I can t use getTimezoneOffset    I need the timezoneOffset of my home - dependent on summertime wintertime    add diff minutes between myself  HOME  and server  timezoneHomeOffset  d  tz    Europe Copenhagen       const utc   new Date d getTime      const dHome   new Date d toLocaleString  en-US     timeZone  tz       const diff   Math round  utc - dHome    60000     60 1000   gt  minutes   d setMinutes d getMinutes     diff    return d

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any mileage in   var d   new Date xiYear  xiMonth  xiDate  toLocaleString

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This is BEST solution  Using      TO ALL dates Date timezoneOffset -240      4 UTC     Override offset only for THIS date new Date   timezoneOffset -180      3 UTC   Code   Date prototype timezoneOffset   new Date   getTimezoneOffset     Date setTimezoneOffset   function timezoneOffset      return this prototype timezoneOffset   timezoneOffset      Date getTimezoneOffset   function       return this prototype timezoneOffset      Date prototype setTimezoneOffset   function timezoneOffset      return this timezoneOffset   timezoneOffset      Date prototype getTimezoneOffset   function       return this timezoneOffset      Date prototype toString   function       var offsetDate  offsetTime    offsetTime   this timezoneOffset   60   1000    offsetDate   new Date this getTime   - offsetTime     return offsetDate toUTCString          Milliseconds    Seconds    Minutes    Hours    Date    Month    FullYear    Year    Day   forEach  function  this      return function key        Date prototype  get    key    function           var offsetDate  offsetTime        offsetTime   this timezoneOffset   60   1000        offsetDate   new Date this getTime   - offsetTime         return offsetDate  getUTC    key                return Date prototype  set    key    function value          var offsetDate  offsetTime  time        offsetTime   this timezoneOffset   60   1000        offsetDate   new Date this getTime   - offsetTime         offsetDate  setUTC    key  value         time   offsetDate getTime     offsetTime        this setTime time         return time                 this      Coffee version   Date prototype timezoneOffset   new Date   getTimezoneOffset     Date setTimezoneOffset    timezoneOffset - gt      return  prototype timezoneOffset   timezoneOffset   Date getTimezoneOffset   - gt      return  prototype timezoneOffset   Date prototype setTimezoneOffset    timezoneOffset - gt      return  timezoneOffset   timezoneOffset   Date prototype getTimezoneOffset   - gt      return  timezoneOffset   Date prototype toString   - gt      offsetTime    timezoneOffset   60   1000     offsetDate   new Date  getTime   - offsetTime      return offsetDate toUTCString            Milliseconds    Seconds    Minutes    Hours        Date    Month    FullYear    Year    Day     forEach  key   gt      Date prototype  get  key      - gt          offsetTime    timezoneOffset   60   1000         offsetDate   new Date  getTime   - offsetTime          return offsetDate  getUTC  key           Date prototype  set  key       value - gt          offsetTime    timezoneOffset   60   1000         offsetDate   new Date  getTime   - offsetTime          offsetDate  setUTC  key    value          time   offsetDate getTime     offsetTime          setTime time          return time

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using  setUTCHours   it would be possible to actually set dates in UTC-time  which would allow you to use UTC-times throughout the system   You cannot set it using UTC in the constructor though  unless you specify a date-string   Using new Date Date UTC year  month  day  hour  minute  second   you can create a Date-object from a specific UTC time

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If you want to deal with the slightly different  but related  problem of creating a Javascript Date object from year  month  day       including timezone     that is  if you want to parse a string into a Date     then you apparently have to do an infuriatingly complicated dance      parseISO8601String   string - gt  Date    Parse an ISO-8601 date  including possible timezone     into a Javascript Date object        Test strings  parseISO8601String x  toISOString       2013-01-31T12 34               - gt   2013-01-31T12 34 00 000Z      2013-01-31T12 34 56            - gt   2013-01-31T12 34 56 000Z      2013-01-31T12 34 56 78         - gt   2013-01-31T12 34 56 780Z      2013-01-31T12 34 56 78 0100    - gt   2013-01-31T11 34 56 780Z      2013-01-31T12 34 56 78 0530    - gt   2013-01-31T07 04 56 780Z      2013-01-31T12 34 56 78-0330    - gt   2013-01-31T16 04 56 780Z      2013-01-31T12 34 56-0330       - gt   2013-01-31T16 04 56 000Z      2013-01-31T12 34 56Z           - gt   2013-01-31T12 34 56 000Z  function parseISO8601String dateString        var timebits       0-9  4  -  0-9  2  -  0-9  2  T  0-9  2     0-9  2        0-9       0-9            -    0-9  2    0-9  2           var m   timebits exec dateString       var resultDate      if  m            var utcdate   Date UTC parseInt m 1                                   parseInt m 2  -1     months are zero-offset                                    parseInt m 3                                   parseInt m 4    parseInt m 5       hh mm                                 m 6   amp  amp  parseInt m 6      0       optional seconds                                 m 7   amp  amp  parseFloat m 7   1000     0      optional fraction            utcdate is milliseconds since the epoch         if  m 9   amp  amp  m 10                 var offsetMinutes   parseInt m 9     60   parseInt m 10                utcdate     m 8            -1    1    offsetMinutes   60000                    resultDate   new Date utcdate         else           resultDate   null            return resultDate      That is  you create a  UTC time  using the date without timezone  so you know what locale it s in  namely the UTC  locale   and it s not defaulted to the local one   and then manually apply the indicated timezone offset   Wouldn t it have been nice if someone had actually thought about the Javascript date object for more than  oooh  five minutes

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any mileage in   var d   new Date xiYear  xiMonth  xiDate  toLocaleString

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if you want to check the difference in a time between two dates  you can simply check if second timezone is lesser or greater from your first desired timezone and subtract or add a time     const currTimezone   new Date   getTimezoneOffset       your timezone   const newDateTimezone   date getTimezoneOffset       date with unknown timezone    if  currTimezone     newDateTimezone           and below you are checking if difference should be - or    It depends on if unknown timezone is lesser or greater than yours     const newTimezone    currTimezone - newDateTimezone     currTimezone  gt  newDateTimezone   1   -1       date setTime date getTime      newTimezone   60   1000

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d   new Date    utc   d getTime      d getTimezoneOffset     60000   nd   new Date utc    3600000 offset     offset value base on which location time zone you would like to set  For India offset value  5 5  New York offset value -4  London offset value  1   for all location offset Wiki List of UTC time offsets

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This may help someone  put UTC at the end of what you pass in to the new constructor  At least in chrome you can say var date   new Date  2014-01-01 11 00 00 UTC

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any mileage in   var d   new Date xiYear  xiMonth  xiDate  toLocaleString

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One line solution   new Date new Date 1422524805305  getTime   - 330 60 1000    Instead of 1422524805305  use the timestamp in milliseconds Instead of 330  use your timezone offset in minutes wrt  GMT  eg India  5 30 is 5 60 30   330 minutes

[javascript] Create a Date with a set timezone without using a string representation

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