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Top Forums UNIX for Dummies Questions & Answers Timestamp - confusion with daylight saving time Post 71742 by softmachine on Saturday 14th of May 2005 05:30:42 AM
Old 05-14-2005
Timestamp - confusion with daylight saving time

Hello!
I'm currently working on a climatological dataset that uses unix-timestamp and a real date like 28/03/2004 02:45:00 h. in spring the unix-timestamp follows its continuos mode but in the column of the real date the time jumps one hour forward (e.g. from 1:59:59 to 3:00:00). i think this is ok if the real time would show central european daylight saving time.
BUT:
in autumn the unix-timestamp follows further its continuous mode and the real time as well: i.e. that the time does not step back again one hour.
in the next spring the real time jumps again one hour forward.
Wouldn't this mean that my data loses every year one hour in spring?
Has anyone an excel-tool that enables me to verify the to different datasets while beeing sure that the real time does not change when daylight saving time is usually applied?

thanks in advance
 

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IDATE(3)								 1								  IDATE(3)

idate - Format a local time/date as integer

SYNOPSIS
int idate (string $format, [int $timestamp = time()]) DESCRIPTION
Returns a number formatted according to the given format string using the given integer $timestamp or the current local time if no time- stamp is given. In other words, $timestamp is optional and defaults to the value of time(3). Unlike the function date(3), idate(3) accepts just one char in the $format parameter. PARAMETERS
o $format - The following characters are recognized in the $format parameter string +------------------+---------------------------------------------------+ |$format character | | | | | | | Description | | | | +------------------+---------------------------------------------------+ | | | | B | | | | | | | Swatch Beat/Internet Time | | | | | | | | d | | | | | | | Day of the month | | | | | | | | h | | | | | | | Hour (12 hour format) | | | | | | | | H | | | | | | | Hour (24 hour format) | | | | | | | | i | | | | | | | Minutes | | | | | | | | I (uppercase i) | | | | | | | returns 1 if DST is activated, 0 otherwise | | | | | | | | L (uppercase l) | | | | | | | returns 1 for leap year, 0 otherwise | | | | | | | | m | | | | | | | Month number | | | | | | | | s | | | | | | | Seconds | | | | | | | | t | | | | | | | Days in current month | | | | | | | | U | | | | | | | Seconds since the Unix Epoch - January 1 1970 | | | 00:00:00 UTC - this is the same as time(3) | | | | | | | | w | | | | | | | Day of the week ( 0 on Sunday) | | | | | | | | W | | | | | | | ISO-8601 week number of year, weeks starting on | | | Monday | | | | | | | | y | | | | | | | Year (1 or 2 digits - check note below) | | | | | | | | Y | | | | | | | Year (4 digits) | | | | | | | | z | | | | | | | Day of the year | | | | | | | | Z | | | | | | | Timezone offset in seconds | | | | +------------------+---------------------------------------------------+ o $timestamp - The optional $timestamp parameter is an integer Unix timestamp that defaults to the current local time if a $timestamp is not given. In other words, it defaults to the value of time(3). RETURN VALUES
Returns an integer. As idate(3) always returns an integer and as they can't start with a "0", idate(3) may return fewer digits than you would expect. See the example below. ERRORS
/EXCEPTIONS Every call to a date/time function will generate a E_NOTICE if the time zone is not valid, and/or a E_STRICT or E_WARNING message if using the system settings or the $TZ environment variable. See also date_default_timezone_set(3) CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.1.0 | | | | | | | Now issues the E_STRICT and E_NOTICE time zone | | | errors. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 idate(3) example <?php $timestamp = strtotime('1st January 2004'); //1072915200 // this prints the year in a two digit format // however, as this would start with a "0", it // only prints "4" echo idate('y', $timestamp); ?> SEE ALSO
date(3), getdate(3), time(3). PHP Documentation Group IDATE(3)
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