dst - PHP daylight saving time detection -

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i need send email users based wherever in world @ 9:00 local time. server in uk. can set time difference between each user , server's time, work if dst didn't exist.

here's example illustrate it:

  • john works in new york, -5 hours server (uk) time
  • richard works in london, uk, 0 hour difference server.

when server goes gmt gmt +1 (bst) @ 2:00am on sunday, means john has -6h time difference now.

this scenario can still handle updating users outside server's local time, once i've moved forward/backward time of other users, still need way detect when (time , date) users living outside uk (or not) change local time probable dst one.

i need php method know/detect when other parts of world enter/exit dst.

do need know details of dst transition yourself? or need know when 9:00 in given timezone?

if it's latter, php can use operating system's timezone database you. strtotime() function remarkably @ "figuring out" mean:

echo strtotime("today 9:00 america/new_york");  // prints "1306501200" echo strtotime("today 9:00 europe/london");     // prints "1306483200"

just make sure you're using 1 of php supported timezones.


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