Internet Strategy Guide

We're starting with a map of the world showing the 24 major timezones. Timezone changes (daylight savings times) make things tricky. The abbreviations for timezones aren't enough to determine the user's timezone. EST can mean different things.

The 64-bit signed integer used internally provides more than enough time for us to use (+/- 90 billion years if I heard correctly). strtotime() and functions with timestamps have been replaced with classes (such as new DateTime()).

The bundled timezone database has 564 zones so far that isn't dependent on timezone abbreviations. They have the format Continent/Location or Continent/Location/Sublocation like Europe/Amsterdam. Updated database is released 20 times a year. Some changes are very sudden. Basically, you're timezone database is probably outdated.

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