Trail Wallet

Handling Time Zones in iOS Apps

Time zones are one of those tricky programming problems. It can be difficult to understand what’s going on and maddening to debug, especially if you have customers all over the world.

The key is understanding that the Date() struct in Foundation returns an absolute timestamp in UTC. UTC is a time standard (i.e. no countries adopt it as a time zone—they would use GMT which is a time zone but, for our purposes, is identical to UTC).

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