mktime and daylight saving

**Marcus** · Jul 29 '06, 08:15 PM

Hello,

Is mktime() dependent on PHP or the server's OS? I just read that
starting next year, the time switches for daylight saving time will be
"on the second Sunday of March and end the first Sunday of November"
instead of the current setup.

Daylight Saving Time - When do we change our clocks?

http://webexhibits.org/daylightsaving/b.html?y=3000

Date calculator. Most of the United States begins Daylight Saving Time at 2:00 a.m. on the second Sunday in March and reverts to standard time on the first Sunday in November. In the U.S., each time zone switches at a different time. In the European Union, Summer Time begins and ends at 1:00 a.m. Universal Time (Greenwich Mean Time). It begins the last Sunday in March and ends the last Sunday in October. In the EU, all time zones change at the same moment.

I am worried because my application deals a lot with Unix timestamps,
and I'm not sure how this change would affect everything.

I tested the new date for daylight saving on March 11, 2007 on Windows
XP and it was not correct - it is still reporting the first Sunday in
April as the date of the switch. I am not sure about Unix, as I have
not tested it. Additionally, I am using php 4.3.10, so if it is in fact
PHP version dependent, I'm not sure what I can do without upgrading.

Thanks for all your help.