在线免费时区转换器

A time zone converter translates a specific date and time from one time zone into the equivalent local time in another — accounting for each zone's UTC offset and any daylight saving time adjustments automatically.

Common time zone conversions

• New York → London: ET is UTC−5 (EST) / UTC−4 (EDT); London is UTC+0 (GMT) / UTC+1 (BST) — typically 5 hours ahead
• London → Dubai: Dubai is UTC+4 all year (no DST) — typically 4 hours ahead of GMT
• New York → Tokyo: JST is UTC+9 — Tokyo is typically 13–14 hours ahead of New York depending on DST
• London → Singapore: SGT is UTC+8 all year — Singapore is 7–8 hours ahead of London

Daylight saving time

Most of North America and Europe observe daylight saving time (DST), advancing clocks by 1 hour in spring and reverting in autumn. The US switches in March and November; the EU switches in the last Sunday of March and October. Countries near the equator and in Asia (China, Japan, Singapore, India) do not observe DST — their UTC offset stays constant year-round, which can make cross-timezone calculations shift by ±1 hour seasonally.

Understanding UTC offsets

UTC (Coordinated Universal Time) is the global time standard. Every time zone is expressed as an offset from UTC: New York is UTC−5 (EST), Paris is UTC+1 (CET), Kolkata is UTC+5:30 (IST — one of the few half-hour offsets). When scheduling international meetings, convert all times to UTC first for the clearest comparison.