How do you handle timezone difference calculation in PHP?

Question

I\'m being told that this below method of calculating the user\'s local time is sometimes not working. What\'s the best way to do this in PHP? What do you do?

Answer 1

Use the DateTime extension, such as DateTime::getOffset,
or DateTimeZone::getOffset

Some countries might have perform several timezone update,
this method DateTimeZone::getTransitions reveal the transition history