I\'m storing the UTC dates into the DB using:
$utc = gmdate(\"M d Y h:i:s A\");
and then I want to convert the saved UTC date to the client
First, get the date in UTC -- you've already done that so this step would really just be a database call:
$timezone = "UTC";
date_default_timezone_set($timezone);
$utc = gmdate("M d Y h:i:s A");
print "UTC: " . date('r', strtotime($utc)) . "\n";
Next, set your local time zone in PHP:
$timezone = "America/Guayaquil";
date_default_timezone_set($timezone);
And now get the offset in seconds:
$offset = date('Z', strtotime($utc));
print "offset: $offset \n";
Finally, add the offset to the integer timestamp of your original datetime:
print "LOCAL: " . date('r', strtotime($utc) + $offset) . "\n";
Here is a straight way to convert the UTC time of the questioner to local time. This is for a stored time in a database etc., i.e. any time. You just have to find the time difference between UTC time and the local time you are interested in and then ajust the stored UTC time adding to it the difference.
$df = "G:i:s"; // Use a simple time format to find the difference
$ts1 = strtotime(date($df)); // Timestamp of current local time
$ts2 = strtotime(gmdate($df)); // Timestamp of current UTC time
$ts3 = $ts1-$ts2; // Their difference
You can then add this difference to the stored UTC time. (In my place, Athens, the difference is exactly 5:00:00)
Example:
$time = time() // Or any other timestamp
$time += $ts3 // Add the difference
$dateInLocal = date("Y-m-d H:i:s", $time);
PHP's strtotime
function will interpret timezone codes, like UTC. If you get the date from the database/client without the timezone code, but know it's UTC, then you can append it.
Assuming you get the date with timestamp code (like "Fri Mar 23 2012 22:23:03 GMT-0700 (PDT)", which is what Javascript code ""+(new Date())
gives):
$time = strtotime($dateWithTimeZone);
$dateInLocal = date("Y-m-d H:i:s", $time);
Or if you don't, which is likely from MySQL, then:
$time = strtotime($dateInUTC.' UTC');
$dateInLocal = date("Y-m-d H:i:s", $time);
I store date in the DB in UTC format but then I show them to the final user in their local timezone
// retrieve
$d = (new \DateTime($val . ' UTC'))->format('U');
return date("Y-m-d H:i:s", $d);
Convert the UTC datetime to America/Denver
// create a $dt object with the UTC timezone
$dt = new DateTime('2016-12-12 12:12:12', new DateTimeZone('UTC'));
// change the timezone of the object without changing it's time
$dt->setTimezone(new DateTimeZone('America/Denver'));
// format the datetime
$dt->format('Y-m-d H:i:s T');
time()
returns the unix timestamp, which is a number, it has no timezone.
date('Y-m-d H:i:s T')
returns the date in the current locale timezone.
gmdate('Y-m-d H:i:s T')
returns the date in UTC
date_default_timezone_set()
changes the current locale timezone
to change a time in a timezone
// create a $dt object with the America/Denver timezone
$dt = new DateTime('2016-12-12 12:12:12', new DateTimeZone('America/Denver'));
// change the timezone of the object without changing it's time
$dt->setTimezone(new DateTimeZone('UTC'));
// format the datetime
$dt->format('Y-m-d H:i:s T');
here you can see all the available timezones
https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
here are all the formatting options
http://php.net/manual/en/function.date.php
Update PHP timezone DB (in linux)
sudo pecl install timezonedb
date()
and localtime()
both use the local timezone for the server unless overridden; you can override the timezone used with date_default_timezone_set()
.
http://www.php.net/manual/en/function.date-default-timezone-set.php
http://us3.php.net/manual/en/function.date.php
http://php.net/manual/en/function.localtime.php