php convert datetime to UTC

Question

I am in need of an easy way to convert a date time stamp to UTC  from whatever timezone the server is in  HOPEFULLY without using any libraries

User · Answer

As strtotime requires specific input format  DateTime  createFromFormat could be used  php 5 3  is required      set timezone to user timezone date default timezone set  str user timezone       create date object using any given format  date   DateTime  createFromFormat  str user dateformat   str user datetime       convert given datetime to safe format for strtotime  str user datetime    date- gt format  Y-m-d H i s        convert to UTC  str UTC datetime   gmdate  str server dateformat  strtotime  str user datetime        return timezone to server default date default timezone set  str server timezone

User · Answer

Follow these steps to get UTC time of any timezone set in user s local system  This will be required for web applications to save different timezones to UTC     Javascript  client-side    var dateVar   new Date    var offset   dateVar getTimezoneOffset      getTimezoneOffset - returns the timezone difference between UTC and Local Time document cookie    offset   offset   Php  server-side    public function convert utc time  date         time difference   isset   COOKIE  offset      COOKIE  offset           if  time difference                  time   strtotime  date            time    time     time difference 60     minutes   60 seconds          date   date  Y-m-d H i s    time           on failure of js  default timezone is set as UTC below     return  date            in my function  timezone    UTC    date    this- gt convert utc time  post date      post date  Y-m-d H i s   echo strtotime  date        timezone

User · Answer

With PHP 5 or superior  you may use datetime  format function  see documentation http   us php net manual en datetime format php    echo strftime    e  B  Y         date create from format  Y-d-m G i s    2012-04-05 11 55 21  - gt format  U              4 May 2012

User · Answer

try      echo date  F d Y   strtotime  2010-01-19 00 00 00       will output       January 19 2010   you should change format time to see other output

User · Answer

Do this way   gmdate  Y-m-d H i s    timestamp    or simply   gmdate  Y-m-d H i s     to get  NOW  in UTC   Check the reference   http   www php net manual en function gmdate php

User · Answer

Using DateTime    given   new DateTime  2014-12-12 14 18 00    echo  given- gt format  Y-m-d H i s e       n      2014-12-12 14 18 00 Asia Bangkok   given- gt setTimezone new DateTimeZone  UTC     echo  given- gt format  Y-m-d H i s e       n      2014-12-12 07 18 00 UTC

User · Answer

I sometime use this method      It is not importnat what timezone your system is set to     Get the UTC offset in seconds   offset   date  Z        Then subtract if from your original timestamp   utc time   date  Y-m-d H i s   strtotime  original time   -   offset   Seconds       Works all MOST of the time

User · Answer

As an improvement on Phill Pafford s answer  I did not understand his  Y-d-mTG i sz  and he suggested to revert timezone    So I propose this  I complicated by changing the HMTL format in plain text        lt  php header  content-type  text plain      my timestamp   strtotime  2010-01-19 00 00 00        stores timezone  my timezone   date default timezone get    echo date DATE ATOM   my timestamp    t   my timezone date  n       changes timezone date default timezone set  UTC    echo date  Y-m-d TH i s Z    my timestamp    t t  ISO8601 UTC date  n   echo date  Y-m-d H i s    my timestamp    t t  your UTC date  n       reverts change date default timezone set  my timezone   echo date DATE ATOM   my timestamp    t   my timezone date is back  n      gt

User · Answer

General purpose normalisation function to format any timestamp from any timezone to other  Very useful for storing datetimestamps of users from different timezones in a relational database  For database comparisons store timestamp as UTC and use with gmdate  Y-m-d H i s          Convert Datetime from any given olsonzone to other      return datetime in user specified format      function datetimeconv  datetime   from   to        try           if   from  localeFormat       Y-m-d H i s                  datetime   DateTime  createFromFormat  from  localeFormat     datetime - gt format  Y-m-d H i s                       datetime   new DateTime  datetime  new DateTimeZone  from  olsonZone               datetime- gt setTimeZone new DateTimeZone  to  olsonZone              return  datetime- gt format  to  localeFormat           catch   Exception  e            return null           Usage    from     localeFormat    gt   quot d m Y H i A quot    olsonZone    gt   Asia Calcutta      to     localeFormat    gt   quot Y-m-d H i s quot    olsonZone    gt   UTC     datetimeconv  quot 14 05 1986 10 45 PM quot    from   to      returns  quot 1986-05-14 17 15 00 quot

User · Answer

Convert local time zone string to UTC string  e g  New Zealand Time Zone    datetime    2016-02-01 00 00 01    given   new DateTime  datetime  new DateTimeZone  Pacific Auckland      given- gt setTimezone new DateTimeZone  UTC      output    given- gt format  Y-m-d H i s     echo   output      NZDT  UTC 13 00         if  datetime    2016-02-01 00 00 01    output    2016-01-31 11 00 01           if  datetime    2016-02-29 23 59 59    output    2016-02-29 10 59 59   NZST  UTC 12 00         if  datetime    2016-05-01 00 00 01    output    2016-04-30 12 00 01           if  datetime    2016-05-31 23 59 59    output    2016-05-31 11 59 59     https   en wikipedia org wiki Time in New Zealand

User · Answer

If you have a date in this format YYYY-MM-HH dd mm ss   you can actually trick php by adding a UTC at the end of your  datetime string  and use strtotime to convert it   date default timezone set  Europe Stockholm    print date  Y-m-d H i s  strtotime  2009-01-01 12 00    UTC      n   print date  Y-m-d H i s  strtotime  2009-06-01 12 00    UTC      n     This will print this   2009-01-01 13 00 00 2009-06-01 14 00 00   And as you can see it takes care of the daylight savings time problem as well   A little strange way to solve it

User · Answer

Try the getTimezone and setTimezone  see the example   But this does use a Class   UPDATE   Without any classes you could try something like this    the date   strtotime  2010-01-19 00 00 00    echo date default timezone get       lt br   gt     echo date  Y-d-mTG i sz   the date      lt br   gt     echo date default timezone set  UTC       lt br   gt     echo date  Y-d-mTG i sz    the date      lt br   gt       NOTE  You might need to set the timezone back to the original as well

User · Answer

Use strtotime to generate a timestamp from the given string  interpreted as local time  and use gmdate to get it as a formatted UTC date back   Example  As requested  here   s a simple example   echo gmdate  d m Y H i   strtotime  2012-06-28 23 55

User · Answer

http   php net manual en function strtotime php or if you need to not use a string but time components instead  then http   us php net manual en function mktime php

User · Answer

alternatively you can try this    lt  php echo  new DateTime  now   new DateTimeZone  Asia Singapore    - gt format  Y-m-d H i s e      gt    this will output        2017-10-25 17 13 20 Asia Singapore   you can use this inside the value attribute of a text input box if you only want to display a read-only date   remove the  e  if you do not wish to show your region country

User · Answer

If you don t mind using PHP s DateTime class  which has been available since PHP 5 2 0  then there are several scenarios that might fit your situation    If you have a  givenDt DateTime object that you want to convert to UTC then this will convert it to UTC    givenDt- gt setTimezone new DateTimeZone  UTC      If you need the original  givenDt later  you might alternatively want to clone the given DateTime object before conversion of the cloned object    utcDt   clone  givenDt   utcDt- gt setTimezone new DateTimeZone  UTC      If you only have a datetime string  e g   givenStr    2018-12-17 10 47 12   then you first create a datetime object  and then convert it  Note this assumes that  givenStr is in PHP s configured timezone    utcDt    new DateTime  givenStr  - gt setTimezone new DateTimeZone  UTC      If the given datetime string is in some timezone different from the one in your PHP configuration  then create the datetime object by supplying the correct timezone  see the list of timezones PHP supports   In this example we assume the local timezone in Amsterdam    givenDt   new DateTime  givenStr  new DateTimeZone  Europe Amsterdam      givenDt- gt setTimezone new DateTimeZone  UTC

[php] php convert datetime to UTC

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