Time Zone Converter

How to Use the Time Zone Converter

Enter the time in 24-hour format by specifying the hour (0-23) and minute (0-59). Select the source time zone where the original time is observed and the target time zone you want to convert to. The converter instantly displays the equivalent time in the target zone, the offset difference in hours, and whether the date shifts forward or backward.

This tool uses standard UTC offsets for each time zone abbreviation. Daylight saving time variants are listed separately (for example, EST vs. EDT, PST vs. PDT) so you can select the correct one for the current season. Half-hour offsets like India Standard Time (IST at UTC+5:30) are fully supported.

Understanding Time Zones

The world is divided into 24 primary time zones, each roughly 15 degrees of longitude wide. All time zones are expressed as offsets from Coordinated Universal Time (UTC). The International Date Line, located at approximately 180 degrees longitude in the Pacific Ocean, is where the calendar date changes. Crossing it eastward subtracts a day, and crossing westward adds a day.

Daylight Saving Time

Many regions observe daylight saving time (DST), advancing clocks by one hour during warmer months to extend evening daylight. In the United States, DST begins the second Sunday of March and ends the first Sunday of November. Not all countries or US states observe DST. Arizona (except the Navajo Nation) and Hawaii do not change their clocks. When scheduling across time zones, always confirm whether DST is currently in effect for both locations.

Tips for Scheduling Across Time Zones

When coordinating meetings or calls across multiple time zones, pick a reference time zone (often UTC) and convert for each participant. Many calendar applications can display multiple time zones simultaneously. For recurring international meetings, be aware that DST transitions happen on different dates in different countries, which can temporarily shift the usual time difference by an hour. Using our converter before each meeting ensures accuracy regardless of seasonal clock changes.

Frequently Asked Questions

How do I convert time between time zones?

Find the UTC offset for both the source and target time zones. Subtract the source offset from the target offset to get the difference. Add that difference (in hours) to your original time. For example, to convert 3:00 PM EST (UTC-5) to PST (UTC-8), the difference is -3 hours, so 3:00 PM EST = 12:00 PM PST.

What is UTC and why does it matter?

UTC (Coordinated Universal Time) is the global time standard that all time zones are defined relative to. It replaced GMT as the reference point. Knowing UTC offsets makes it simple to convert between any two time zones by calculating the difference between their offsets.

What is the difference between EST and EDT?

EST (Eastern Standard Time) is UTC-5 and is used during winter months. EDT (Eastern Daylight Time) is UTC-4 and is used during daylight saving time from the second Sunday in March to the first Sunday in November. The same pattern applies to CST/CDT, MST/MDT, and PST/PDT.

How do half-hour time zones work?

Some regions use UTC offsets that are not whole hours. India Standard Time (IST) is UTC+5:30, Nepal is UTC+5:45, and parts of Australia use UTC+9:30. When converting to or from these zones, you must account for the fractional hour in your calculation.

Does the date change when converting time zones?

Yes, it can. If the converted time goes past midnight (above 23:59), it rolls into the next day. If it goes below 00:00, it rolls back to the previous day. For example, 11:00 PM EST converted to JST (UTC+9) is 1:00 PM the next day because of the 14-hour difference.