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How to calculate the time difference by mathematical method? For example: 15 hours slow. What time are 8 am and 20 pm in China?
China is the time zone (+8 time zone) of East Eighth District.

If it's 8 am Beijing time, it's 0 am London time.

The place that is 15 hours slower than China is the West Seventh District (-7 time zone), and it was 17 the day before.

It's 20 o'clock in China and 5 o'clock in that place.

That is to say, China X point

If x>= 15, that place is (x- 15) point.

If x