UTC Offset

UTC offset

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Description:
The UTC offset is the time offset from Coordinated Universal Time (UTC). It is mostly given as hour or hour and minute. Many time zones employ two time offsets, one for standard time and one for daylight saving time. Before the introduction of UTC on 1 January 1972 Greenwich Mean Time (also known as Zulu time) was the same as Universal Time (UT).

Converting between time zones

UTC time to UTC+offset time

To convert from UTC to UTC+offset time zones, one adds the offset to the UTC time to get the UTC+offset time. The offset should be taken with the proper sign, so that it can be either a positive or a negative number. An example will illustrate.

Take the 00 time zone. Its offset is -5 hours, which means that one must add -5 hours to the UTC time to get the UTC-05:00 time (meaning, one must subtract 5 hours from the UTC time). For example, suppose that right now, the local time in the UTC time zone is 4:00 p.m. (16:00 military time). What is then the local time right now in the UTC-05:00 time zone? The answer: it is 4:00 p.m. + offset = 4:00 p.m. + (-5 hours) = 4:00 p.m. - 5 hours = 11:00 a.m. (in military time: 16:00 + (-05:00) = 16:00 - 05:00 = 11:00).

At the same moment, the local time in the 00 time zone is 4:00 p.m. + offset = 4:00 p.m. + (5 hours) = 9:00 p.m. (in military time: 16:00 + (+05:00)= 21:00).

UTC+offset time to UTC time

In this case one must subtract the offset from the UTC+offset, being careful to realize that subtracting a negative number means adding...

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