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Alex Rivera
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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. Here's an example to illustrate it: John works in New York, -5 hours from the server (UK) time Richard works in London, UK, so 0 hour difference with the server. When the server goes from GMT to GMT +1 (BST) at 2:00am on a certain Sunday, this means that John now has a -6H time difference now. This scenario I can still handle by updating all the users outside the server's local time, but once I've moved forward/backward the time of all the other users, I still need a way to detect when (time and date) the users living outside the UK will (or will not) change their local time to a probable DST one. I need a PHP method to know/detect when other parts of the world will enter/exit DST.
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