Parse date without timezone javascript

Question

I want to parse date without timezone in JavaScript  I have tried   new Date Date parse  2005-07-08T00 00 00 0000       Returns Fri Jul 08 2005 02 00 00 GMT 0200  Central European Daylight Time   new Date Date parse  2005-07-08 00 00 00 GMT 0000       Returns same result  new Date Date parse  2005-07-08 00 00 00 GMT-0000       Returns same result  I want to parse time    Without time zone  Without calling constructor Date UTC or new Date year  month  day   Just simple passing string into Date constructor  without prototype approaches   I have to product Date object  not String

User · Answer

There are some inherent problems with date parsing that are unfortunately not addressed well by default.

-Human readable dates have implicit timezone in them
-There are many widely used date formats around the web that are ambiguous

To solve these problems easy and clean one would need a function like this:

>parse(whateverDateTimeString,expectedDatePattern,timezone)
"unix time in milliseconds"

I have searched for this, but found nothing like that!

So I created: https://github.com/zsoltszabo/timestamp-grabber

Enjoy!

User · Answer

I ran into the same problem and then remembered something wonky about a legacy project I was working on and how they handled this issue  I didn t understand it at the time and didn t really care until I ran into the problem myself  var date    2014-01-02T00 00 00 000Z  date   date substring 0 10  split  -   date   date 1     -    date 2     -    date 0   new Date date   Thu Jan 02 2014 00 00 00 GMT-0600   For whatever reason passing the date in as  01-02-2014  sets the timezone to zero and ignores the user s timezone  This may be a fluke in the Date class but it existed some time ago and exists today  And it seems to work cross-browser  Try it for yourself   This code is implemented in a global project where timezones matter a lot but the person looking at the date did not care about the exact moment it was introduced

User · Answer

Since it is really a formatting issue when displaying the date  e g  displays in local time   I like to use the new ish  Intl DateTimeFormat object to perform the formatting as it is more explicit and provides more output options   const dateOptions     timeZone   UTC   month   long   day   numeric   year   numeric      const dateFormatter   new Intl DateTimeFormat  en-US   dateOptions   const dateAsFormattedString   dateFormatter format new Date  2019-06-01T00 00 00 000 00 00      console log dateAsFormattedString      June 1  2019    As shown  by setting the timeZone to  UTC  it will not perform local conversions  As a bonus  it also allows you to create more polished outputs  You can read more about the Intl DateTimeFormat object from Mozilla - Intl DateTimeFormat   Edit   The same functionality can be achieved without creating a new Intl DateTimeFormat object  Simply pass the locale and date options directly into the toLocaleDateString   function   const dateOptions     timeZone   UTC   month   long   day   numeric   year   numeric     const myDate   new Date  2019-06-01T00 00 00 000 00 00    today toLocaleDateString  en-US   dateOptions       June 1  2019

User · Answer

You can use this code  var stringDate    2005-07-08T00 00 00 0000   var dTimezone   new Date    var offset   dTimezone getTimezoneOffset     60  var date   new Date Date parse stringDate    date setHours date getHours     offset

User · Answer

new Date   toString    replace    w - d                This will have output  Tue Jul 10 2018 19 07 11   new Date  2005-07-08T11 22 33 0000   toString    replace    w - d                This will have output  Fri Jul 08 2005 04 22 33  Note  The time returned will depend on your local timezone

User · Answer

The Date object itself will contain timezone anyway  and the returned result is the effect of converting it to string in a default way  I e  you cannot create a date object without timezone  But what you can do is mimic the behavior of Date object by creating your own one  This is  however  better to be handed over to libraries like moment js

User · Answer

The date is parsed correctly  it s just toString that converts it to your local timezone    x000D   x000D  let s    2005-07-08T11 22 33 0000   x000D  let d   new Date Date parse s    x000D   x000D     this logs for me  x000D      Fri Jul 08 2005 13 22 33 GMT 0200  Central European Summer Time    x000D     and something else for you x000D   x000D  console log d toString     x000D   x000D     this logs x000D     Fri  08 Jul 2005 11 22 33 GMT x000D     for everyone x000D   x000D  console log d toUTCString    x000D   x000D   x000D    Javascript Date object are timestamps - they merely contain a number of milliseconds since the epoch  There is no timezone info in a Date object  Which calendar date  day  minutes  seconds  this timestamp represents is a matter of the interpretation  one of to   String methods     The above example shows that the date is being parsed correctly - that is  it actually contains an amount of milliseconds corresponding to  2005-07-08T11 22 33  in GMT

User · Answer

Just a generic note  a way to keep it flexible    https   developer mozilla org en-US docs Web JavaScript Reference Global Objects Date  We can use getMinutes    but it return only one number for the first 9 minutes    x000D   x000D  let epoch   new Date      Or any unix timestamp x000D   x000D  let za   new Date epoch   x000D      zaR   za getUTCFullYear    x000D      zaMth   za getUTCMonth    x000D      zaDs   za getUTCDate    x000D      zaTm   za toTimeString   substr 0 5   x000D   x000D  console log zaR   -    zaMth    -    zaDs  zaTm  x000D   x000D   x000D    Date prototype getDate       Returns the day of the month  1-31  for the specified date according to local time  Date prototype getDay       Returns the day of the week  0-6  for the specified date according to local time  Date prototype getFullYear       Returns the year  4 digits for 4-digit years  of the specified date according to local time  Date prototype getHours       Returns the hour  0-23  in the specified date according to local time  Date prototype getMilliseconds       Returns the milliseconds  0-999  in the specified date according to local time  Date prototype getMinutes       Returns the minutes  0-59  in the specified date according to local time  Date prototype getMonth       Returns the month  0-11  in the specified date according to local time  Date prototype getSeconds       Returns the seconds  0-59  in the specified date according to local time  Date prototype getTime       Returns the numeric value of the specified date as the number of milliseconds since January 1  1970  00 00 00 UTC  negative for prior times   Date prototype getTimezoneOffset       Returns the time-zone offset in minutes for the current locale  Date prototype getUTCDate       Returns the day  date  of the month  1-31  in the specified date according to universal time  Date prototype getUTCDay       Returns the day of the week  0-6  in the specified date according to universal time  Date prototype getUTCFullYear       Returns the year  4 digits for 4-digit years  in the specified date according to universal time  Date prototype getUTCHours       Returns the hours  0-23  in the specified date according to universal time  Date prototype getUTCMilliseconds       Returns the milliseconds  0-999  in the specified date according to universal time  Date prototype getUTCMinutes       Returns the minutes  0-59  in the specified date according to universal time  Date prototype getUTCMonth       Returns the month  0-11  in the specified date according to universal time  Date prototype getUTCSeconds       Returns the seconds  0-59  in the specified date according to universal time  Date prototype getYear       Returns the year  usually 2-3 digits  in the specified date according to local time  Use getFullYear   instead

User · Answer

I have the same issue  I get a date as a String  for example   2016-08-25T00 00 00   but I need to have Date object with correct time  To convert String into object  I use getTimezoneOffset   var date   new Date  2016-08-25T00 00 00   var userTimezoneOffset   date getTimezoneOffset     60000  new Date date getTime   - userTimezoneOffset     getTimezoneOffset   will return ether negative or positive value  This must be subtracted to work in every location in world

User · Answer

simple solution  const handler1       construct target  args        let newDate   new target    args       var tzDifference   newDate getTimezoneOffset        return new target newDate getTime     tzDifference   60   1000           Date   new Proxy Date  handler1

User · Answer

Date in javascript is just keeping it simple inside  so the date-time data is stored in UTC unix epoch  milliseconds or ms    If you want to have a  fixed  time that doesn t change in whatever timezone you are on the earth  you can adjust the time in UTC to match your current local timezone and save it  And when retreiving it  in whatever your local timezone you are in  it will show the adjusted UTC time based on the one who saved it and the add the local timezone offset to get the  fixed  time   To save date  in ms   toUTC datetime      const myDate    typeof datetime      number         new Date datetime        datetime     if   myDate     typeof myDate getTime      function          return 0         const getUTC   myDate getTime      const offset   myDate getTimezoneOffset     60000     It s in minutes so convert to ms   return getUTC - offset     UTC - OFFSET     To retreive show date  in ms   fromUTC datetime      const myDate    typeof datetime      number         new Date datetime        datetime     if   myDate     typeof myDate getTime      function          return 0         const getUTC   myDate getTime      const offset   myDate getTimezoneOffset     60000     It s in minutes so convert to ms   return getUTC   offset     UTC   OFFSET     Then you can   const saveTime   new Date toUTC Date parse  2005-07-08T00 00 00 0000         SEND TO DB         FROM DB    const showTime   new Date fromUTC saveTime

User · Answer

This is the solution that I came up with for this problem which works for me      library used  momentjs with plain javascript Date class   Step 1  Convert String date to moment object  PS  moment retains the original date and time as long as toDate   method is not called    const dateMoment   moment  2005-07-08T11 22 33 0000     Step 2  Extract hours and minutes values from the previously created moment object     const hours   dateMoment hours      const mins   dateMoment minutes      Step 3  Convert moment to Date PS  this will change the original date based on the timezone of your browser machine  but don t worry and read step 4       const dateObj   dateMoment toDate      Step 4  Manually set the hours and minutes extracted in Step 2     dateObj setHours hours     dateObj setMinutes mins     Step 5  dateObj will now have show the original Date without any timezone difference  Even the Daylight time changes won t have any effect on the date object as we are manually setting the original hours and minutes   Hope this helps

[javascript] Parse date without timezone javascript

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