For example, if it’s 06:00 (UTC+8), how would I convert it? How does the +8 part works?
In: 1
6 – 8 = 22 in modulo 24, i.e. wrapping around at 24 (never using the number 24 itself).
So the location where it is 06:00 is 8 hours ahead (east) of GMT / UTC 0, Greenwich (London), England.
> The earth is divided into 24 time zones, -11 to +12. Each time zone is 1 hour long, or 15° wide in longitude. Greenwich England is, by definition, in the middle of Time Zone 0, the prime meridian. UTC time is the local time at Greenwich England. Time in other locations will be the UTC time hour plus or minus the local Time Zone. Daylight savings time adds 1 hour to the local standard (real) time. -wikipedia
Clearly the international dateline is very roughly opposite GMT so when you cross that you jump forward by a day if traveling west from GMT.
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