I’m using the America/New York timezone. In the Fall we “fall back” an hour — effectively “gaining” one hour at 2am. At the transition point the following happens:
I’m storing events in my database. I have ‘start’ and ‘end’ date times, ‘tickets_start’ and ‘tickets_end’ (for when ticket sales actually start/end – as opposed to the start/end of the actual event).
I need to send an email to users based wherever in the world at 9:00 am local time. The server is in the UK. What I can do is set up a time difference between each user and the server’s time, which would then perfectly work if DST didn’t exist.
In PHP, you can tell if a given date is during the Daylight Savings Time period by using something like this:
When dealing with local DateTime values provided by a user, it’s quite possible to have a time that is either invalid or ambiguous, due to Daylight Saving Time transitions.
How do I check if daylight saving time is in effect?
