Question

How is the standard time of a place determined?

Answer 1

You need to use a time zone database. I like Current Local Times Around the World. You could also use a time zone map, but many don’t show what places use daylight saving time, and those that do don’t show when it is in effect.

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Answer 2

The government in control of that place decides, usually based on historical precedent. They then declare the time as a time zone with a specific offset from UTC. The time is roughly related to solar time but in extreme casesit deviate by up to 3 hours..
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