Time Zone Converter
Last Updated:
Convert any time between world time zones instantly. All US zones, Europe, Asia, and Oceania. Handles daylight saving automatically.
Converted Time
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📐 How Time Zone Conversion Works
Every time zone is defined by its UTC offset — the number of hours ahead or behind Coordinated Universal Time (UTC). To convert: (1) Find the UTC equivalent of your source time by subtracting the source offset. (2) Add the destination offset. Daylight Saving Time shifts many zones by +1 hour from March to November in the Northern Hemisphere.
US Time Zones Explained
The continental US spans four time zones. Eastern Time (ET) is UTC-5 in winter (EST) and UTC-4 in summer (EDT) — used by New York, Miami, Atlanta, and Washington D.C. Central Time (CT) is one hour behind Eastern — Chicago, Houston, Dallas. Mountain Time (MT) is UTC-7 in winter — Denver, Phoenix (which doesn't observe daylight saving). Pacific Time (PT) is UTC-8 in winter — Los Angeles, Seattle, Las Vegas.
When Does Daylight Saving Time Change?
In the United States, Daylight Saving Time begins on the second Sunday in March (clocks spring forward 1 hour at 2:00 AM) and ends on the first Sunday in November (clocks fall back 1 hour at 2:00 AM). Arizona (except Navajo Nation) and Hawaii do not observe DST. This converter uses your browser's built-in timezone database, so DST is handled automatically for every date you enter.
Scheduling International Meetings Across Time Zones
The best overlap window for US East Coast and Western Europe is 9:00 AM–12:00 PM EST (3:00–6:00 PM CET). For US West Coast and India, there is virtually no standard-hours overlap — 9:00 AM PST is 10:30 PM IST. The converter above shows exactly what any given time looks like in multiple key cities simultaneously.
How to Use the Time Zone Converter
Enter the source time and date
Input the time and date in the origin location. Date matters — crossing midnight shifts the date, and Daylight Saving transitions change UTC offsets seasonally.
Select source and target time zones
Choose from the dropdown list covering 400+ time zones worldwide. Major cities are listed by name with their standard UTC offset shown for reference.
Read the converted time
The result shows the equivalent local time at the destination, accounting for the UTC offset difference and any Daylight Saving adjustments in effect on the selected date.
Use for meeting scheduling
When scheduling international calls, check the business hours at all locations. Most tools assume weekday availability — verify weekend and holiday schedules separately.
How Time Zones Work
The Earth is divided into 24 primary time zones, each roughly 15 degrees of longitude wide (360° ÷ 24 hours = 15° per hour). The reference point is Coordinated Universal Time (UTC), formerly known as GMT (Greenwich Mean Time). Locations east of UTC have positive offsets (UTC+1, UTC+2…); locations west have negative offsets (UTC−5, UTC−8…). New York is UTC−5 in winter (EST) and UTC−4 in summer (EDT). London is UTC+0 in winter (GMT) and UTC+1 in summer (BST).
In practice, time zones do not follow longitude precisely — they follow political and economic boundaries. China uses a single time zone (UTC+8) across its entire landmass for national unity, despite spanning five natural time zones. India uses UTC+5:30 (a half-hour offset). Nepal uses UTC+5:45. Australia has three main time zones including UTC+9:30 and UTC+10:30. These irregularities mean the converter must use a database of political time zones rather than simple longitude math.
Daylight Saving Time: The Source of Most Scheduling Errors
Daylight Saving Time (DST) shifts clocks forward one hour in spring and back in autumn, but different countries transition on different dates. The US transitions the second Sunday in March (spring forward) and the first Sunday in November (fall back). The UK transitions the last Sunday in March and October. The EU transitions the last Sunday in March and October — but has voted to abolish seasonal changes, with implementation pending. Australia transitions in October (spring in the southern hemisphere). Countries near the equator generally do not observe DST. These differing transition dates mean that a regular international meeting scheduled at "9am New York / 2pm London" will shift by one hour during the weeks between when one country transitions and the other hasn't yet — a common source of missed international calls.
Sources & Methodology
Calculations are based on the most current publicly available data from authoritative government and industry sources:
Frequently Asked Questions
EST (UTC-5) is: CST+1hr, MST+2hr, PST+3hr, London (GMT) at EST+5, Paris/Berlin (CET) at EST+6, Dubai (GST) at EST+9, India (IST) at EST+10:30, Tokyo (JST) at EST+14, Sydney (AEDT) at EST+16 in summer.
The continental US has 4: Eastern, Central, Mountain, and Pacific. Adding Alaska (UTC-9) and Hawaii (UTC-10) makes 6. US territories extend this further — Puerto Rico uses AST (UTC-4), Guam uses ChST (UTC+10).
Yes. This tool uses your browser's built-in IANA timezone database (the same database used by your operating system), so daylight saving adjustments are automatic for every date — past, present, or future.
UTC (Coordinated Universal Time) is the global time standard. Every time zone is expressed as UTC+ or UTC- an offset. UTC never changes for daylight saving. Servers, aviation, and international finance all use UTC to avoid ambiguity across zones.