Pick a time and city to see the matching wall-clock time in any number of cities around the world. DST is handled automatically.
Intuitive, friction-free workflow designed to get you from input to accurate results in seconds.
Pick your home city and a time.
Add the cities you want to see.
Drag the time slider to compare across the day.
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Time zone math is full of edge cases, DST jumps, half-hour offsets, and political changes. We use the IANA tz database so the result matches what calendars and phones show.
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Remote teams lose hours every week to timezone confusion. Saying meet at 3 PM without a zone attached causes someone to join at the wrong hour. Daylight saving shifts add another layer, US and EU clocks change on different dates.
A timezone converter shows the same moment in multiple cities side by side. Before you send a calendar invite, verify the local time for every attendee. Your future self will not be apologising in Slack at midnight.
Manually calculating time zone differences between cities across different hemispheres is prone to math mistakes. A digital time zone calculator computes the exact hour and minute difference relative to UTC (Coordinated Universal Time).
Whether you are coordinating between New York (ET), London (GMT/BST), Karachi (PKT), or Tokyo (JST), using an interactive slider allows you to visualize morning, afternoon, and evening slots simultaneously to pick optimal meeting windows.
Not all countries observe Daylight Saving Time, and those that do transition on different calendar dates. For instance, North America switches DST weeks before most European countries, leading to a temporary one-hour offset shift that catches many professionals by surprise.
Our converter references the official IANA time zone registry to automatically reflect active standard and daylight times for 300+ global cities, ensuring your international schedules never fall out of sync.
Here are the offsets people convert most often (during US/EU standard time; DST can shift these by an hour). EST to PST: subtract 3 hours (3:00 PM EST = 12:00 PM PST). EST to CST: subtract 1 hour. GMT/UTC to EST: subtract 5 hours. UTC to IST (India): add 5 hours 30 minutes. UTC to PKT (Pakistan): add 5 hours. UTC to JST (Japan): add 9 hours. London (GMT/BST) to New York (ET): subtract 5 hours.
For anything beyond these common pairs, or on the days around a Daylight Saving Time change, use the live converter above. It reads the IANA database so the result always matches what phones and calendars display, no manual math required.
Straightforward answers regarding time zone converter calculations, platform limits, and data privacy.
The time zone calculator uses the global IANA time zone database. When you select your home city and target cities, it computes the exact hour difference, taking into account each location's local UTC offset and seasonal Daylight Saving Time adjustments.
Yes! You can compare multiple cities across different time zones simultaneously. The visual slider highlights common working hours, making it easy to find a meeting time that works for everyone across US, European, and Asian business hours.
Each city is tied to its IANA time zone. On DST transition days, the converted time reflects the change for that specific zone, for example, the US shifts on the second Sunday in March while Europe shifts the last Sunday.
India (+5:30), Iran (+3:30), Newfoundland (−3:30), parts of Australia (+9:30) and Nepal (+5:45) all use non-whole-hour offsets. Our converter handles them correctly.
Pick the nearest large city in the same IANA zone, the offset and DST rules will be identical.
Usually a recent DST change. Verify the date, DST shifts only affect the specific day the rule changes.
Pacific Time is 3 hours behind Eastern Time, so 3:00 PM EST is 12:00 PM PST. Set your home city to New York and add Los Angeles to see the live conversion, including the days around DST changes when the gap can briefly differ.
India Standard Time is UTC+5:30, so 12:00 UTC is 5:30 PM IST. India does not observe Daylight Saving Time, so this offset stays constant all year. Add New Delhi as a target city to convert any UTC time to IST instantly.
The overlap window for US East Coast, Central Europe and India is usually 8:00–10:30 AM US Eastern (around 2:00–4:30 PM in Europe and 6:30–9:00 PM in India). Add all three cities and use this world clock converter online to spot the shared working hours before you send the invite.
In-depth articles and tutorials to get the most out of Time Zone Converter.
Master transatlantic scheduling between North America and Europe. Learn time differences between EST/PST and GMT/CET, daylight shifts, and overlap windows.
Master global scheduling across multiple time zones. Learn how to convert UTC offsets, navigate March and October Daylight Saving Time discrepancies, and find overlapping business hours.
Calculate exact time differences and find optimal meeting windows. Understand fractional time zones like India and Nepal, asynchronous handoffs, and daylight shifts.
Avoid missing international meetings during Daylight Saving Time. Learn why US and European clock changes desynchronize and how to schedule recurring calls safely.