Convert UTC Epoch to local date

Question

I have been fighting with this for a bit now  I   m trying to convert epoch to a date object  The epoch is sent to me in UTC  Whenever you pass new Date   an epoch  it assumes it   s local epoch  I tried creating a UTC object  then using setTime   to adjust it to the proper epoch  but the only method that seems useful is toUTCString   and strings don   t help me  If I pass that string into a new date  it should notice that it   s UTC  but it doesn   t   new Date  new Date   toUTCString     toLocaleString     My next attempt was to try to get the difference between local current epoch and UTC current epoch  but I wasn   t able to get that either   new Date  new Date   toUTCString     getTime   - new Date   getTime     It   s only giving me very small differences  under 1000  which is in milliseconds   Any suggestions

User · Answer

It s easy  new Date   just takes milliseconds  e g    new Date 1394104654000   gt  Thu Mar 06 2014 06 17 34 GMT-0500  EST

User · Answer

Considering  you have epoch time available       for eg  epoch time   1487086694 213 var date   new Date epoch time   1000      multiply by 1000 for milliseconds var date string   date toLocaleString  en-GB        24 hour format

User · Answer

If you prefer to resolve timestamps and dates conversions from and to UTC and local time without libraries like moment js  take a look at the option below   For applications that use UTC timestamps  you may need to show the date in the browser considering the local timezone and daylight savings when applicable  Editing a date that is in a different daylight savings time even though in the same timezone can be tricky   The Number and Date extensions below allow you to show and get dates in the timezone of the timestamps  For example  lets say you are in Vancouver  if you are editing a date in July or in December  it can mean you are editing a date in PST or PDT   I recommend you to check the Code Snippet down below to test this solution   Conversions from milliseconds  Number prototype toLocalDate   function          var value   new Date this        value setHours value getHours      value getTimezoneOffset     60         return value      Number prototype toUTCDate   function          var value   new Date this        value setHours value getHours   -  value getTimezoneOffset     60         return value       Conversions from dates  Date prototype getUTCTime   function          return this getTime   -  this getTimezoneOffset     60000        Usage     Adds the timezone and daylight savings if applicable  1499670000000  toLocalDate        Eliminates the timezone and daylight savings if applicable new Date 2017  6  10  getUTCTime      See it for yourself   x000D   x000D     Extending Number x000D   x000D  Number prototype toLocalDate   function      x000D      var value   new Date this   x000D   x000D      value setHours value getHours      value getTimezoneOffset     60    x000D   x000D      return value  x000D     x000D   x000D  Number prototype toUTCDate   function      x000D      var value   new Date this   x000D   x000D      value setHours value getHours   -  value getTimezoneOffset     60    x000D   x000D      return value  x000D     x000D   x000D     Extending Date x000D   x000D  Date prototype getUTCTime   function      x000D      return this getTime   -  this getTimezoneOffset     60000   x000D     x000D   x000D     Getting the demo to work x000D  document getElementById  m-to-local-button   addEventListener  click   function      x000D    var displayElement   document getElementById  m-to-local-display    x000D        value   document getElementById  m-to-local   value  x000D        milliseconds   parseInt value   x000D     x000D    if  typeof milliseconds      number   x000D      displayElement innerText    milliseconds  toLocalDate   toISOString    x000D    else x000D      displayElement innerText    Set a value   x000D     false   x000D   x000D  document getElementById  m-to-utc-button   addEventListener  click   function      x000D    var displayElement   document getElementById  m-to-utc-display    x000D        value   document getElementById  m-to-utc   value  x000D        milliseconds   parseInt value   x000D     x000D    if  typeof milliseconds      number   x000D      displayElement innerText    milliseconds  toUTCDate   toISOString    x000D    else x000D      displayElement innerText    Set a value   x000D     false   x000D   x000D  document getElementById  date-to-utc-button   addEventListener  click   function      x000D    var displayElement   document getElementById  date-to-utc-display    x000D        yearValue   document getElementById  date-to-utc-year   value     1970   x000D        monthValue   document getElementById  date-to-utc-month   value     0   x000D        dayValue   document getElementById  date-to-utc-day   value     1   x000D        hourValue   document getElementById  date-to-utc-hour   value     0   x000D        minuteValue   document getElementById  date-to-utc-minute   value     0   x000D        secondValue   document getElementById  date-to-utc-second   value     0   x000D        year   parseInt yearValue   x000D        month   parseInt monthValue   x000D        day   parseInt dayValue   x000D        hour   parseInt hourValue   x000D        minute   parseInt minuteValue   x000D        second   parseInt secondValue   x000D     x000D    displayElement innerText   new Date year  month  day  hour  minute  second  getUTCTime    x000D     false   x000D   lt link href  https   cdnjs cloudflare com ajax libs semantic-ui 2 2 11 semantic css  rel  stylesheet   gt  x000D   x000D   lt div class  ui container  gt  x000D     lt p gt  lt  p gt  x000D     x000D     lt h3 gt Milliseconds to local date lt  h3 gt  x000D     lt input id  m-to-local  placeholder  Timestamp  value  0    gt   lt button id  m-to-local-button  gt Convert lt  button gt  x000D     lt em id  m-to-local-display  gt Set a value lt  em gt  x000D   x000D     lt h3 gt Milliseconds to UTC date lt  h3 gt  x000D     lt input id  m-to-utc  placeholder  Timestamp  value  0    gt   lt button id  m-to-utc-button  gt Convert lt  button gt  x000D     lt em id  m-to-utc-display  gt Set a value lt  em gt  x000D     x000D     lt h3 gt Date to milliseconds in UTC lt  h3 gt  x000D     lt input id  date-to-utc-year  placeholder  Year  style  width  4em     gt  x000D     lt input id  date-to-utc-month  placeholder  Month  style  width  4em     gt  x000D     lt input id  date-to-utc-day  placeholder  Day  style  width  4em     gt  x000D     lt input id  date-to-utc-hour  placeholder  Hour  style  width  4em     gt  x000D     lt input id  date-to-utc-minute  placeholder  Minute  style  width  4em     gt  x000D     lt input id  date-to-utc-second  placeholder  Second  style  width  4em     gt  x000D     lt button id  date-to-utc-button  gt Convert lt  button gt  x000D     lt em id  date-to-utc-display  gt Set the values lt  em gt  x000D     x000D   lt  div gt  x000D   x000D   x000D

User · Answer

Epoch time is in seconds from Jan  1  1970  date getTime   returns milliseconds from Jan  1  1970  so   if you have an epoch timestamp  convert it to a javascript timestamp by multiplying by 1000      function epochToJsDate ts              ts   epoch timestamp            returns date obj         return new Date ts 1000            function jsDateToEpoch d              d   javascript date obj            returns epoch timestamp         return  d getTime  -d getMilliseconds    1000

User · Answer

var myDate   new Date  your epoch date  1000    source - https   www epochconverter com programming  javascript

User · Answer

To convert the current epoch time in  ms  to a 24-hour time  You might need to specify the option to disable 12-hour format       node exe -e  var date   new Date Date now     console log date toLocaleString  en-GB     hour12 false         2 7 2018  19 35 24   or as JS   var date   new Date Date now      console log date toLocaleString  en-GB     hour12 false          2 7 2018  19 35 24  console log date toLocaleString  en-GB     hour  numeric   minute  numeric   second  numeric   hour12 false          19 35 24   Note  The use of en-GB here  is just a  random  choice of a place using the 24 hour format  it is not your timezone

User · Answer

EDIT  var utcDate   new Date incomingUTCepoch   var date   new Date    date setUTCDate utcDate getDate     date setUTCHours utcDate getHours     date setUTCMonth utcDate getMonth     date setUTCMinutes utcDate getMinutes     date setUTCSeconds utcDate getSeconds     date setUTCMilliseconds utcDate getMilliseconds       EDIT fixed

User · Answer

Epoch time  i e  Unix Epoch time  is nearly always the number of seconds that have expired since 1st Jan 1970 00 00 00  UTC time   not the number of milliseconds which some of the answers here have implied   https   en wikipedia org wiki Unix time  Therefore  if you have been given a Unix Epoch time value it will probably be in seconds  and will look something like 1547035195  If you want to make this human readable in JavaScript  you need to convert the value to milliseconds  and pass that value into the Date value  constructor  e g    const unixEpochTimeMS   1547035195   1000  const d   new Date unixEpochTimeMS      Careful  the string output here can vary by implementation    const strDate   d toLocaleString      You don t need to do the d setUTCMilliseconds 0  step in the accepted answer because the JavaScript Date value  constructor takes a UTC value in milliseconds  not a local time    https   developer mozilla org en-US docs Web JavaScript Reference Global Objects Date Syntax  Also note that you should avoid using the Date      constructor that takes a string datetime representation  this is not recommended  see the link above

User · Answer

I think I have a simpler solution -- set the initial date to the epoch and add UTC units  Say you have a UTC epoch var stored in seconds  How about 1234567890  To convert that to a proper date in the local time zone   var utcSeconds   1234567890  var d   new Date 0      The 0 there is the key  which sets the date to the epoch d setUTCSeconds utcSeconds     d is now a date  in my time zone  set to Fri Feb 13 2009 18 31 30 GMT-0500  EST

User · Answer

Are you just asking to convert a UTC string to a  local  string   You could do   var utc string    2011-09-05 20 05 15   var local string    function dtstr        var t0   new Date dtstr       var t1   Date parse t0 toUTCString   replace  GMT             var t2    2   t0  - t1      return new Date t2  toString       utc string

User · Answer

Addition to the above answer by  djechlin  d    1394104654000   new Date parseInt d      converts EPOCH time to human readable date  Just don t forget that type of EPOCH time must be an Integer

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And just for the logs  I did this using Moment js library  which I was using for formatting anyway   moment utc 1234567890000  local    gt Fri Feb 13 2009 19 01 30 GMT-0430  VET

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function ToLocalDate  inDate        var date   new Date        date setTime inDate valueOf   - 60000   inDate getTimezoneOffset         return date

User · Answer

The Easiest Way If you have the unix epoch in milliseconds  in my case - 1601209912824  convert it into a Date Object as so  const dateObject   new Date milliseconds  const humanDateFormat   dateObject toString     output - Sun Sep 27 2020 18 01 52 GMT 0530  India Standard Time    if you want the date in UTC -  const dateObject   new Date milliseconds  const humanDateFormat   dateObject toUTCString      Now you can format it as you please

User · Answer

The simplest solution I ve found to this  is   var timestamp   Date now       returns milliseconds since epoch time     normalisedTime   new Date timestamp     Notice this doesn t have the   1000 at the end of new Date timestamp  statement as this  for me anyway   always seems to give out the wrong date  ie instead of giving the year 2019 it gives the year as 51015  so just bear that in mind

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Amjad  good idea  but a better implementation would be    Date prototype setUTCTime   function UTCTimestamp        var UTCDate   new Date UTCTimestamp       this setUTCFullYear UTCDate getFullYear    UTCDate getMonth    UTCDate getDate         this setUTCHours UTCDate getHours    UTCDate getMinutes    UTCDate getSeconds    UTCDate getMilliseconds         return this getTime

[javascript] Convert UTC Epoch to local date

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