Time Zone Offset Converter

About this Time Zone Offset Converter

The Time Zone Offset Converter shifts a date and time between two numeric UTC offsets, such as UTC+5 and UTC−4. It is useful when you already know the correct offsets for the locations and date involved.

Coordinating meetings, flights and international deadlines across time zones is one of the most common sources of scheduling mistakes, since time zone offsets from UTC vary not only by region but also change seasonally in places that observe daylight saving time.

For related tasks, try Unix Timestamp Converter, Time Converter or Time Duration Calculator.

How the calculation works

The tool subtracts the source offset to obtain UTC, then adds the destination offset. It uses fixed offsets and does not automatically apply daylight-saving or historical time-zone rules.

How to use it

1. Enter the local date and time.
2. Enter the source and destination UTC offsets.
3. Convert to see the destination local date and time.

Practical example

Converting 12:00 at UTC+5 to UTC+0 produces 07:00 on the same date.

A meeting scheduled for 3:00 PM UTC converts to 10:00 AM in a UTC-5 time zone or to 4:00 PM in a UTC+1 time zone, and both of these offsets shift by an hour during their respective daylight saving periods.

Things to double-check

This tool converts between two fixed UTC offsets, which correctly handles the underlying math, but daylight saving time changes a region's actual offset from UTC for part of the year, so always confirm the currently-in-effect offset for a location.

How offsets work

A time zone offset is the difference from UTC. Pakistan is UTC+5 all year, India is UTC+5:30 and Nepal is UTC+5:45. A meeting at 15:00 in Pakistan is 10:00 UTC. Converting between zones means subtracting the source offset to get UTC and adding the target offset. The tool does this for the two fixed offsets you enter, and it adjusts the date when the result passes midnight.

Daylight saving time

Offsets change in places that use daylight saving time. New York is UTC minus 5 in winter and UTC minus 4 in summer, so 15:00 in Pakistan, which is 10:00 UTC, is 06:00 in New York in October and 05:00 after the clocks go back on 1 November 2026. The UK and much of Europe change on 25 October 2026. Use the offset in force on the date of your event, not the standard one.

Scheduling across countries

When you schedule a meeting between countries, pick a time that is reasonable for everyone and send it in more than one zone, or in UTC with a link. Avoid the weeks when countries change clocks on different dates, because the gap between two cities can change by an hour. Mention the date as well, since late evening in one place can be the next day in another.

Travel and remote work

Time differences matter for jet lag, flight planning and remote teams. As a rule of thumb, it can take roughly a day per hour of time difference to adjust fully, though it varies. For daily work with a distant team, agree on a window of overlapping hours and record decisions in writing. Use the half-hour and 45-minute zones carefully, since they are easy to miss.

Common offsets

Standard offsets from UTC include Pakistan at plus 5, India at plus 5:30, Bangladesh at plus 6, the UAE at plus 4, Saudi Arabia at plus 3, China and Singapore at plus 8, Japan at plus 9, the UK in winter at 0, central Europe in winter at plus 1, New York in winter at minus 5 and Los Angeles in winter at minus 8. Many of these shift by one hour in summer where daylight saving is used, so check the current offset for the date you need. Pakistan does not currently change its clocks.

Worked example: a meeting across three cities

A team in Karachi, London and New York wants to meet at 16:00 Pakistan time, which is UTC+5. That is 11:00 UTC. In London, which is on summer time at UTC+1 until 25 October 2026, it is 12:00. In New York, which is on daylight time at UTC minus 4 until 1 November, it is 07:00. After the clocks change in London, the same Karachi time would be 11:00 in London, and after New York changes, it would be 06:00 there. Writing out the offsets for the exact date avoids surprises.

When the date changes

A time difference can move the date as well as the hour. A call at 22:00 in Pakistan is 17:00 UTC. In Sydney, which is on daylight time at UTC+11 from early October, that is 04:00 the next morning. Always include the date and the day of the week when you share a time across zones, especially with people on the other side of the world. Calendar invitations that store the time zone convert automatically, but plain text messages do not.

Planning meetings fairly

When people are spread across zones, find the window where everyone's local time is reasonable, such as between 8 am and 8 pm. For Karachi, London and New York, the overlap is small: 17:00 in Karachi is 13:00 in London and 08:00 in New York in summer. Rotate the burden of early and late meetings instead of always asking the same people. Record decisions in writing so that those who could not attend are not left behind, and consider asynchronous updates for routine matters.

Use names, not just offsets, in software

If you build or configure software that deals with time, store times in UTC and convert to local time only for display. Use named zones such as Asia/Karachi instead of fixed offsets, because countries change their daylight saving rules, and a named zone carries the history of those changes. This calculator uses the two fixed offsets that you enter, so for a date in the future, check that the offset is the one in force on that date. For travel, confirm local time with an airline or a trusted source.

Key terms explained

A time zone is a region that uses the same standard time. The offset is the difference from UTC, written as plus or minus hours. UTC is the world reference time. Daylight saving time moves clocks forward in summer in some regions. A named zone such as Asia/Karachi stores the rules for a place. The International Date Line is where the date changes. Local time is the time shown on the clocks of a place. A meeting planner finds a time that suits several zones.

Rules of thumb and quick checks

To convert from one zone to another, subtract the source offset to get UTC and add the target offset. The difference between two zones is the difference between their offsets, so plus 5 and minus 5 are 10 hours apart. Always check whether either place is on daylight time on the date. Write the date and the time zone name when you share a time, and confirm with a world clock for important events.

Frequently asked questions