Question 1

What is UTC?

Accepted Answer

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks and time. It is the successor to Greenwich Mean Time (GMT) and does not observe daylight saving time. All other time zones are expressed as positive or negative offsets from UTC. For example, New York is UTC-5 in winter and UTC-4 in summer (due to daylight saving time).

Question 2

How do I convert time between time zones?

Accepted Answer

To convert time between zones, first find the UTC offset of your source zone and the UTC offset of your target zone. Add the source offset to get UTC, then add the target offset to get the local time. For example, converting 3:00 PM New York (UTC-5) to Tokyo (UTC+9): 3 PM + 5 = 8 PM UTC, then 8 PM + 9 = 5 AM next day Tokyo. This tool does all that math automatically using the browser's built-in Intl.DateTimeFormat API.

Question 3

What is Daylight Saving Time (DST)?

Accepted Answer

Daylight Saving Time (DST) is the practice of advancing clocks by one hour during summer months so that evening daylight lasts longer. Not all countries observe DST — for example, Japan, India, China, and most of Africa do not. In the US and EU it typically starts in March and ends in November, shifting time zones like Eastern from UTC-5 to UTC-4. This tool automatically accounts for DST when computing conversions, as the Intl API uses IANA time zone data which includes DST rules.

Time Zone Converter

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