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Full Discussion: UTC time and Local time
Top Forums UNIX for Dummies Questions & Answers UTC time and Local time Post 302552857 by forte712 on Monday 5th of September 2011 11:29:26 PM
Old 09-06-2011
UTC time and Local time

Hi,

A few days ago I changed my CentOS box's timezone to -07:00.
Now the date commands output look like this (run almost simultaneously, less than 1 second delay)..
Code:
# date
Mon Sep  5 20:23:40 PDT 2011
# date -u
Tue Sep  6 03:24:05 UTC 2011

The hours difference seems correct, but why is the UTC time 25 seconds ahead?
I always thought that those two commands should only differ by the timezone (and daylight saving if applicable).

Thanks.

Last edited by Franklin52; 09-07-2011 at 03:38 AM.. Reason: Please use code tags for code and data samples, thank you
 

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DATE_DEFAULT_TIMEZONE_GET(3)						 1					      DATE_DEFAULT_TIMEZONE_GET(3)

date_default_timezone_get - Gets the default timezone used by all date/time functions in a script

SYNOPSIS
string date_default_timezone_get (void ) DESCRIPTION
In order of preference, this function returns the default timezone by: o Reading the timezone set using the date_default_timezone_set(3) function (if any) o Prior to PHP 5.4.0 only: Reading the $TZ environment variable (if non empty) o Reading the value of the date.timezone ini option (if set) o Prior to PHP 5.4.0 only: Querying the host operating system (if supported and allowed by the OS). This uses an algorithm that has to guess the time- zone. This is by no means going to work correctly for every situation. A warning is shown when this stage is reached. Do not rely on it to be guessed correctly, and set date.timezone to the correct timezone instead. If none of the above succeed, date_default_timezone_get will return a default timezone of UTC. RETURN VALUES
Returns a string. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.4.0 | | | | | | | The TZ environment variable is no longer used to | | | guess the timezone. | | | | | 5.4.0 | | | | | | | The timezone is no longer guessed from informa- | | | tion available through the operating system as | | | the guessed timezone can not be relied on. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 Getting the default timezone <?php date_default_timezone_set('Europe/London'); if (date_default_timezone_get()) { echo 'date_default_timezone_set: ' . date_default_timezone_get() . '<br />'; } if (ini_get('date.timezone')) { echo 'date.timezone: ' . ini_get('date.timezone'); } ?> The above example will output something similar to: date_default_timezone_set: Europe/London date.timezone: Europe/London Example #2 Getting the abbreviation of a timezone <?php date_default_timezone_set('America/Los_Angeles'); echo date_default_timezone_get() . ' => ' . date('e') . ' => ' . date('T'); ?> The above example will output: America/Los_Angeles => America/Los_Angeles => PST SEE ALSO
date_default_timezone_set(3), "List of Supported Timezones". PHP Documentation Group DATE_DEFAULT_TIMEZONE_GET(3)
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