Get the Olson TZ name for the local timezone?

How do I get the Olson timezone name (such as Australia/Sydney ) corresponding to the value given by C's localtime call?

Why is subtracting these two times (in 1927) giving a strange result?

If I run the following program, which parses two date strings referencing times one second apart and compares them:

timezone between NY and London

i have 2 servsers 1 in america (NY) and 1 in europe (London)

How to check is timezone identifier valid from code?

I'll try to explain what's the problem here.

According to list of supported timezones from PHP manual, I can see all valid TZ identifiers in PHP.

How do i get the gmt time in php

I have a server which is set to EST and all records in the db are set to EST. i would like to know how to set it to gmt? I want to put a time zone option to my users.

jQuery FullCalendar timezone syncronization

I am using the jQuery Fullcalendar plugin (http://arshaw.com/fullcalendar). I am only using it for "full day" events. When the user creates an event, I store it in my database via php as a date (2012-01-12). When sending the list of events to FullCalendar via ajax I convert the date to UNIX time.