Global Time · World Clock
Time Zone
Calculator
Convert any time to multiple time zones simultaneously. See live world clocks, find meeting overlap hours, and compare UTC offsets for any date.
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Your UTC
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🕐 Source Time to Convert
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🌐 Converted Times (click + to add zones)
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📅 Business Hours Overlap (9am–5pm local)
Green = business hours in that zone. Cyan = all zones overlap (best meeting times).
🕐 Live World Clocks (auto-updates)
Understanding Time Zones
Time zones divide the world into regions that share a standard time. Most are offset from Coordinated Universal Time (UTC) by whole hours, though some zones use 30- or 45-minute offsets.
Key Time Zone Facts
UTC = Coordinated Universal Time (the global standard, no DST)
GMT = Greenwich Mean Time ≈ UTC (used in UK in winter)
EST = UTC−5 | EDT = UTC−4 (US Eastern, shifts with DST)
PST = UTC−8 | PDT = UTC−7 (US Pacific)
IST = UTC+5:30 (India — a 30-minute offset zone)
JST = UTC+9 (Japan — no DST observed)
Total time zones: ~38 distinct offsets worldwide
What is UTC and why is it used?
UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. Unlike GMT, UTC is based on atomic clocks and never observes Daylight Saving Time — it's always the same. All other time zones are expressed as UTC+ or UTC−. When scheduling across zones, converting everyone to UTC first eliminates confusion. UTC was established in 1960 and is maintained by the BIPM (Bureau International des Poids et Mesures).
What is Daylight Saving Time (DST)?
DST is the practice of advancing clocks by 1 hour in spring and setting them back in fall — "spring forward, fall back." Its purpose is to make better use of natural daylight. Not all countries observe DST — Japan, India, China, and most of Africa do not. In the US, DST runs from the 2nd Sunday of March to the 1st Sunday of November. The EU has been debating abolishing DST since 2018. DST can cause meeting time confusion when two locations differ in their DST schedules.
Why does India have a 30-minute offset (UTC+5:30)?
India uses a single time zone (IST = Indian Standard Time = UTC+5:30) for the entire country despite its large east-west span. The 30-minute offset was chosen as a compromise between the western and eastern extremes of the country. Several other places also use non-standard offsets: Nepal (UTC+5:45), Iran (UTC+3:30), and parts of Australia (UTC+9:30). These fractional offsets make them the exact middle ground between two standard zones.