Time Zone Calculator

Convert time between different time zones worldwide. Supports all major time zones including EST, PST, GMT, CET, IST, and JST.

The hour in 24-hour format.

Minutes past the hour.

The source time zone.

The target time zone.

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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