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About This Calculator
With 24 primary time zones and numerous half-hour and quarter-hour offsets worldwide, converting between local times is surprisingly error-prone without a dedicated tool. This calculator converts any time between zones while accounting for daylight saving transitions that shift on different dates in each region. International business teams, travelers, and remote workers rely on accurate time zone conversion to avoid missed meetings and scheduling conflicts.
Quick Tips
- 1 India and Nepal use half-hour and quarter-hour offsets unlike most countries.
- 2 Always convert to UTC first when scheduling across three or more time zones.
- 3 Daylight saving transitions shift differently in the Northern and Southern hemispheres.
Example Calculation
A meeting at 3:00 PM EST — time in London, Tokyo, and Sydney.
London: 8:00 PM | Tokyo: 5:00 AM next day | Sydney: 7:00 AM next day
How Time Zone Conversion Works
Time zones are defined as offsets from Coordinated Universal Time (UTC). To convert between zones, the calculator finds the UTC equivalent of your source time, then applies the target zone offset. For example, 3 PM EST (UTC-5) equals 8 PM GMT (UTC+0).
Major World Time Zones
Key time zones include EST/EDT (US East Coast, UTC-5/-4), PST/PDT (US West Coast, UTC-8/-7), GMT (London, UTC+0), CET (Central Europe, UTC+1), IST (India, UTC+5:30), JST (Japan, UTC+9), and AEST (Australia East, UTC+10).
Daylight Saving Time Considerations
This calculator uses standard time offsets. During daylight saving time, clocks move forward by one hour in many regions. For example, EST (UTC-5) becomes EDT (UTC-4). Check whether DST is in effect for your specific date and region.
Scheduling Across Time Zones
When scheduling international meetings, find overlapping business hours. US East Coast (EST) and Western Europe (CET) overlap from about 9 AM to noon EST. US West Coast and East Asia have minimal overlap, often requiring early morning or late evening calls.
Frequently Asked Questions
This calculator uses fixed UTC offsets for standard time. Daylight saving time shifts vary by date and region. During DST, add one hour to the standard offset (for example, EST becomes EDT at UTC-4 instead of UTC-5).
If the result exceeds 23:59 or goes below 00:00, the calculator wraps around and indicates whether it falls on the next day (+1 day) or previous day (-1 day).
India Standard Time (IST) is UTC+5:30, using a 30-minute offset to better align with the country geographical position. Nepal uses UTC+5:45, and a few other zones also use non-whole-hour offsets.
The US continental time zones are one hour apart. EST is 1 hour ahead of CST, which is 1 hour ahead of MST, which is 1 hour ahead of PST. So 3 PM EST = 2 PM CST = 1 PM MST = 12 PM PST.