Use this free time zone converter to turn a date and time in one place into the time in another, such as PST to EST, EST to CST, UTC to EST or New York to London. Choose a city or a zone, and the answer shows both places side by side, the difference between them and the same moment in other big cities. Daylight saving is included for the date you pick. Tables show an hour-by-hour chart for your pair, the time in the US time zones and the short names such as EST, EDT and UTC, and the Time Difference tab shows when the difference between two places changes. Nothing you enter is saved.
How to convert time between time zones
Choose a date and a time, pick the place you are starting from and the one you want to convert to, and press Convert Time. You can choose a city, or a zone such as EST, PST, CST, UTC or GMT. The answer shows the two places side by side with the difference between them, the date (which can be the next or the previous day), and the same moment in other big cities. The 12-hour and 24-hour buttons change how the times are written.
9:00 AM EST (UTC−5) = 2:00 PM GMT (UTC+0)London is 5 hours ahead of New York that day, so you add 5 hours.
How to convert PST to EST, EST to PST, CST to EST and EST to CST
The US time zones are one hour apart from each other. Eastern time is 3 hours ahead of Pacific time, so 9:00 AM PST is 12:00 PM EST. It is 1 hour ahead of Central time, so 8:00 PM CST is 9:00 PM EST, and 2 hours ahead of Mountain time. Going the other way you take the hours off: 3:00 PM EST is 12:00 PM PST. The Time Conversion Chart under the converter lists every hour of the day for the pair you choose, and the quick picks (EST → PST, PST → EST, EST → CST, CST → EST and more) fill in the two zones for you.
EST, EDT and ET
ET means Eastern Time, the zone as a whole. EST is Eastern Standard Time, UTC−5, which is used in winter. EDT is Eastern Daylight Time, UTC−4, which is used in summer. The same goes for Central (CST and CDT), Mountain (MST and MDT) and Pacific (PST and PDT). When you pick EST or PST here, the converter uses the time in that region on the date you choose and shows the right name for it, so in July you will see EDT and PDT instead.
Daylight saving time is included
Most countries in Europe, North America and Australasia change their clocks during the year, and they do it on different dates. The converter uses the time zone rules built into your browser, so it uses the right offset for the date you choose. The difference between New York and London is usually 5 hours, but it is 4 hours for a few weeks in spring and autumn, when one country has changed its clocks and the other has not. In 2027, for example, the US moves its clocks forward on 14 March and the UK on 28 March, so New York and London are 4 hours apart in between. The Time Difference tab shows the next changes for any pair of places.
Two times a year a local time can be tricky. When the clocks go forward, an hour does not exist: 2:30 AM on 8 March 2026 never happens in New York. When they go back, an hour happens twice. The converter tells you when your time is one of these and explains what it did.
UTC, GMT and time zone offsets
UTC (Coordinated Universal Time) is the world reference that other times are measured from. GMT (Greenwich Mean Time) has the same offset in everyday use. A time zone offset such as UTC+5:30 (India) or UTC−5 (New York in winter) says how far a place is ahead of or behind UTC. Some places have an offset that is not a whole hour, such as India at UTC+5:30 or Nepal at UTC+5:45, so the answer can end in :30 or :45. To go from UTC to EST, take 5 hours off in winter, or 4 in summer: 12:00 UTC is 7:00 AM EST.
London time to US time
London is usually 5 hours ahead of New York (Eastern), 6 hours ahead of Chicago (Central), 7 hours ahead of Denver (Mountain) and 8 hours ahead of Los Angeles (Pacific). So 9:00 AM in London is 4:00 AM in New York, 3:00 AM in Chicago, 2:00 AM in Denver and 1:00 AM in Los Angeles in winter. For a few weeks in March and for about a week in October or November the gap to New York is 4 hours, because the US and the UK move their clocks on different dates. Press the London → New York quick pick, or choose London and a US city, to see the answer for any date.
US time zones
The United States has six main time zones: Eastern, Central, Mountain, Pacific, Alaska and Hawaii. Most of the country moves its clocks for daylight saving, but Hawaii and most of Arizona do not. The US Time Zones Converter table shows one time in all six zones at once.
Tips for planning across time zones
- Always check the date as well as the time. A morning meeting in one place can be the previous evening somewhere else.
- Use Use my time zone to start from the zone your device is set to, and the swap button to reverse the conversion.
- Look at the same moment in other cities under the answer to check that the time is reasonable for everyone.
- Near the days when the clocks change, enter the exact date, because the difference between two places can change for a few weeks.
Calculators that go with this one
To add or subtract hours and minutes, use the Time Calculator. To add up work hours, use the Hours Calculator, and to count days between dates use the Day Counter or the Date Calculator.
