Convert time between 50+ world time zones instantly. Works for any date and time.
UTC (Coordinated Universal Time) is the global time standard. GMT (Greenwich Mean Time) is practically identical but technically a time zone.
DST shifts clocks +1 hour in spring and -1 hour in fall. This converter automatically accounts for DST based on the selected date.
New York ↔ London: 5 hrs (4 hrs during BST). Tokyo ↔ New York: 13 hrs. Sydney ↔ London: 10–11 hrs depending on DST.
When scheduling across zones, aim for morning hours in western locations and afternoon in eastern locations for maximum overlap.
New York (Eastern Time) is typically 5 hours behind London (GMT/BST). During US Eastern Daylight Time (March–November), the difference is 5 hours. During UK British Summer Time (March–October), the difference shifts to 4 hours, then back to 5 hours in winter when only the US is on standard time. The exact difference depends on whether one or both locations are observing daylight saving time.
To schedule a meeting across time zones: 1) Identify the time zones of all participants. 2) Use this converter to find a time that falls within business hours (9 AM–6 PM) for all parties. 3) When emailing the invite, include the time in each participant's local zone (e.g., '3 PM ET / 8 PM GMT / 9 PM CET'). 4) Use calendar apps like Google Calendar, which display meetings in each attendee's local time automatically.
UTC offset notation describes how many hours a time zone is ahead of or behind Coordinated Universal Time. UTC+0 is the same as UTC (used in UK in winter, Portugal, Iceland). UTC+5:30 is India Standard Time (IST) — 5 hours and 30 minutes ahead of UTC. UTC-8 is US Pacific Standard Time — 8 hours behind UTC. The offsets change with daylight saving time (e.g., Pacific time becomes UTC-7 during summer months).
France spans the most time zones (12), including overseas territories. Russia has 11 time zones across its landmass, making it the country with the most zones by land area. The United States spans 6 time zones (Eastern, Central, Mountain, Pacific, Alaska, Hawaii). China officially uses a single time zone (UTC+8) despite its vast east-west extent, causing sunrise times to vary by several hours across the country.
Not all time zones are whole-hour offsets from UTC. India uses UTC+5:30, Nepal UTC+5:45, and Australia's South Australia uses UTC+9:30. These offsets emerged historically — countries set their clocks based on the solar noon of their capital city before UTC standardization. India's 5:30 offset, for instance, was set to split the difference between the eastern and western edges of the subcontinent.
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