Time Zone Converter

What Is the Time Zone Converter?

This tool converts a clock time from one UTC offset to another -- useful for scheduling calls or meetings across time zones without doing the mental arithmetic yourself. It supports half-hour offsets (like India's UTC+5:30) since not every time zone sits on a whole-hour boundary.

How to Use This Calculator

Enter a time and the "from" and "to" UTC offsets (in hours, e.g. -5 for US Eastern Standard Time, +5.5 for India). The result shows the converted time and flags whether the conversion lands on the next or previous day.

How the Conversion Works

Worked Example

Practical Uses

• Scheduling a meeting across two time zones without manual math
• Checking what time a flight or event lands in local time
• Coordinating with a remote team member in a different UTC offset

To convert the same time between 12-hour and 24-hour notation instead of across time zones, see the Military Time Converter.

Step-by-Step: Converting a Meeting Time

Start with the time in the source zone, then enter the source offset and the target offset as numbers of hours relative to UTC. West of UTC is negative and east is positive. The result is the shifted clock time plus a day indicator if it crossed midnight. Before you rely on it, confirm the offsets that apply on the actual date, because many regions change offset during the year.

Worked Example With a Day Change

Suppose a hypothetical call is at 8:30 PM in a zone at UTC-5, and you want the time at UTC+5.5. The difference is 10.5 hours. Adding it to 8:30 PM gives 7:00 AM, and because the sum passed midnight, the result shows a +1 day flag: the call falls on the following calendar day for the person in the target zone. Going the other way, 2:00 AM at UTC+5.5 converted to UTC-5 subtracts 10.5 hours and lands at 3:30 PM on the previous day, so a -1 day flag appears.

Handling Daylight Saving Correctly

The tool does not know dates, regions, or daylight saving rules; it only subtracts two numbers you supply. That makes the offsets the single most important input. A zone that is UTC-5 in winter may be UTC-4 in summer. Look up the offset in effect on the date of the event, from a trustworthy source such as your operating system clock settings or an official time authority, and enter that value. Mixing a winter offset for one party with a summer offset for the other is the classic reason meetings arrive an hour early or late.

Common Mistakes

• Entering the sign backwards. UTC+5 means five hours ahead of UTC. Entering -5 by mistake reverses the direction and gives a result off by ten hours.
• Ignoring the day flag. A result of 7:00 AM means very little if you miss that it is the next day for the recipient.
• Assuming all offsets are whole hours. Use decimals for half-hour and 45-minute zones such as 5.5 or 5.75.
• Forgetting that some regions skip daylight saving. Do not assume neighboring places share the same offset on the same date.

Good Practice for Scheduling

When you send an invite, state the time in both zones and include the date for each. Reading back the converted date guards against day-shift confusion. For recurring meetings, recheck the conversion around the weeks when either region changes its clocks, since the gap between the two places can change by an hour for a short time even though nothing about the meeting changed.

Frequently Asked Questions