Introduction
Need to know what time it is in another part of the world? Our free Time Zone Calculator makes it simple. Just pick a date, enter a time, and choose the two time zones you want to compare. The tool will instantly convert the time for you and show the exact difference in hours and minutes. It also tells you if the date changes during the conversion, so you never get confused about what day it is at your destination.
This calculator covers every time zone in the world, from Baker Island (UTC-12:00) all the way to the Line Islands (UTC+14:00), and it applies each place's daylight saving time rules for the date you pick. This tool gives you a fast and accurate answer when you are scheduling a work call with a team overseas, planning a trip, or just curious about the current time in another country. Type in a city, country, or region name to quickly find the right time zone, or pick one from the dropdown list.
How to Use Our Time Zone Calculator
Enter a date, time, and two time zones below. The calculator will instantly convert your time from one zone to the other and show you the exact difference.
Select Date: Pick the date you want to convert. This is the date in your starting time zone.
Enter Time: Type the time you want to convert in 24-hour format (HH:MM:SS). For example, type 15:03:09 for 3:03:09 PM.
Convert From: Choose the time zone you are converting from. You can search by city, country, or region name, or pick one from the dropdown list.
Convert To: Choose the time zone you want to convert to. Search or select it the same way as the source zone.
Swap Button: Click the arrow button between the two time zones to quickly switch them around.
Calculate: Press the Calculate button to see your converted time, the time difference, and a full breakdown of both UTC offsets.
Reset: Press the Reset button to clear all fields and start over with today's date and default settings.
What Is a Time Zone Calculator?
A time zone calculator converts the time in one place to the time in another place. The Earth is split into different time zones. Each zone's clock is roughly based on how far it is from the Prime Meridian in Greenwich, London. Clocks are set as an offset from Coordinated Universal Time, or UTC. Every time zone has an offset from UTC, measured in hours and sometimes half hours or quarter hours.
Why Time Zones Exist
The Earth rotates once every 24 hours. Because of this, different parts of the world see sunlight at different times. Without time zones, noon in New York and noon in Tokyo would mean very different things. Time zones keep clocks lined up with the sun so that daytime hours make sense for people everywhere.
How Time Zone Conversion Works
To convert time between two zones, you find the difference in their UTC offsets. For example, in January New York is UTC-05:00 and London is UTC+00:00. The difference is 5 hours, so when it is 2:00 PM in New York, it is 7:00 PM in London. Both cities move their clocks for daylight saving time, but not on the same dates. In the United States, daylight saving time runs from the second Sunday of March to the first Sunday of November.1 In the UK, the clocks go forward on the last Sunday in March and back on the last Sunday in October.2 So for a few weeks each spring and fall, the gap is 4 hours instead of 5. If the difference is large enough, the converted time can land on a different calendar day. This is called a day rollover.
When You Need Time Zone Conversion
Time zone conversion is useful when you schedule meetings with people in other countries, plan international travel, watch live events broadcast from another region, or call friends and family abroad. It helps you avoid calling someone in the middle of the night or missing an important event because you got the time wrong. If you are coordinating across business days, keep in mind that weekdays and holidays may also differ between countries.
Unusual Time Zones
Most time zones are offset by whole hours, but some are not. India uses UTC+05:30.3 Nepal uses UTC+05:45.3 The Chatham Islands in New Zealand use UTC+12:45 as standard time.4 The widest offset is UTC+14:00, used by the Line Islands in Kiribati.4 The earliest offset is UTC-12:00, used by Baker Island. This means there can be a full 26-hour difference between two places on Earth at the same moment.