UTC Offset Explained: What the Numbers Mean

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Frequently Asked Questions

What does UTC+5:30 mean?
UTC+5:30 means the local time is 5 hours and 30 minutes ahead of UTC. If UTC is 12:00 noon, then UTC+5:30 is 5:30 PM. India uses this offset year-round. The plus sign indicates ahead of UTC; a minus sign indicates behind.
What is the difference between a UTC offset and a time zone?
A UTC offset is a number (like UTC+2 or UTC−5) that tells you how far a location’s clock is from UTC right now. A time zone is a named region with rules that may include seasonal offsets (DST). The same time zone can have different UTC offsets at different times of year.
Why does a UTC offset change twice a year?
In regions that observe daylight saving time, the local clock shifts by one hour, changing the UTC offset. New York, for example, switches between UTC−5 (EST) in winter and UTC−4 (EDT) in summer. UTC itself never changes.