Timezone Converter
Enter any date and time to see it converted across major world timezones instantly. Use the Compare field to view any two zones side by side, or search over 400 cities for an exact offset. DST transitions are applied automatically based on the selected date.
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How timezone conversion works
Every timezone is defined as an offset from UTC (Coordinated Universal Time), the global time standard that replaced GMT. A positive offset means the zone is ahead of UTC -- Tokyo at UTC+9 is nine hours ahead. A negative offset means behind -- New York at UTC-5 is five hours behind during winter.
Most of the complexity in timezone conversion comes from daylight saving time (DST). When a region observes DST, its UTC offset shifts by one hour for part of the year -- New York moves from UTC-5 (EST) in winter to UTC-4 (EDT) in summer. This converter uses the IANA timezone database to apply the correct offset for any date you pick, including across DST boundaries.
Not every region observes DST. Japan, India, most of Africa, China, Iceland, and the US state of Arizona all stay on a fixed offset year-round. This makes them easier to schedule around -- London is always four hours behind Dubai, regardless of the time of year.
Some timezones use non-standard offsets. India runs at UTC+5:30, Nepal at UTC+5:45, and parts of Australia at UTC+9:30 and UTC+10:30. This converter handles all of them correctly.
Common timezone conversions
A few frequently needed pairs and their typical offsets. Note that these shift during DST transitions -- use the tool above for any specific date.
Frequently asked questions
What is the difference between UTC, GMT, and a timezone abbreviation like EST?
UTC is the current global time standard -- a fixed reference that does not shift for daylight saving. GMT (Greenwich Mean Time) is functionally identical but technically a timezone, not a standard. Abbreviations like EST (Eastern Standard Time) and EDT (Eastern Daylight Time) refer to the same region at different times of year: EST is UTC-5, EDT is UTC-4.
Why does the same city show different UTC offsets at different times of year?
Daylight saving time shifts a region's clocks forward by one hour in spring and back in fall, changing its UTC offset for roughly half the year. Use the date picker above to see the exact offset for any specific date.
Does this converter handle half-hour and quarter-hour offsets?
Yes. India (UTC+5:30), Iran (UTC+3:30), Nepal (UTC+5:45), and other non-standard offsets are all handled correctly using the IANA timezone database.
How do I find the best overlap time for a meeting across time zones?
Use the date picker to set a candidate meeting time in your local zone, then check the converted times for all attendees in the Popular Timezones list or Compare field. The Overlap Zones tool on Time Keep is purpose-built for this -- it shows a visual grid of working hours across multiple cities at once.
What is the +1d indicator next to some times?
It means the converted time falls on a different calendar day than your local time. +1d means it is the next day in that timezone; -1d means it is the previous day. This is common when converting between timezones that span midnight.