php - Using a default time zone for each user -

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in system, going use default time zone asia/kolkata. if user accesses china, possible show complete system information related time zone? how implement this?

note: going use mktime store dates in integer format. using ip2country find user country.

i having big confusion in part of conversion of time stamp values, if user 1 post india, user 2 view from china displaying time based o china.


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