World clock

How to read the world clock

The list runs from the zone furthest behind UTC to the one furthest ahead, so the cities at the bottom reached today’s date first. Your own time is at the top. Every row shows the local time and date, the UTC offset, and the difference from you. “+9 h” means that city is nine hours ahead of you. The line under each city is its day from midnight to midnight, with a dot at the current local time, and rows where it is night are shaded. The date matters as much as the time. When it is evening in Los Angeles, it is already the next morning in Tokyo and Sydney, and the date beside those cities shows it.

To build your own clock, add cities with the box at the top and remove them with the × on their row. The set is saved in this browser and written into the page address, so a bookmark or a shared link opens the same clock. Your cities are not sent to us: the list, the times and the calculations all stay in your browser.

Offsets that are not whole hours

Most of the world keeps time a whole number of hours from UTC, but not all of it. These are all the offsets with half or quarter hours in current use, from the time zone database:

• UTC−9:30: Marquesas Islands
• UTC−3:30: St. John’s (Newfoundland)
• UTC−2:30: St. John’s (Newfoundland)
• UTC+3:30: Tehran
• UTC+4:30: Kabul
• UTC+5:30: Colombo, Kolkata
• UTC+5:45: Kathmandu
• UTC+6:30: Yangon
• UTC+8:45: Eucla
• UTC+9:30: Adelaide, Broken Hill, Darwin
• UTC+10:30: Adelaide, Broken Hill, Lord Howe Island
• UTC+12:45: Chatham Islands
• UTC+13:45: Chatham Islands

Some of them are summer times, such as Adelaide moving from UTC+9:30 to UTC+10:30. Lord Howe Island moves its clocks by only 30 minutes for summer time, from UTC+10:30 to UTC+11. For a meeting across these zones, a time on the hour in one city is at half past or quarter to in the other. A converter avoids the mental arithmetic.

Why the gaps between cities change

101 of the database’s 312 geographic zones change their clocks for daylight saving time, and they do not all change on the same day. The United States moves forward on the second Sunday of March and back on the first Sunday of November. The European Union and the United Kingdom change on the last Sundays of March and October, and Australia and New Zealand in the opposite seasons. So for two or three weeks each March, and about one week around the start of November, New York is four hours behind London instead of five. Sydney, which changes in the opposite seasons, is 9 hours ahead of London in the northern summer, 11 hours ahead in the northern winter, and 10 for a few weeks in between.

Rules change too, several times a year. This clock uses the current time zone database, not the browser’s own copy, which can lag behind such changes by months; how we keep time lists the 2026 changes. Daylight saving time has every upcoming change by date.

Where the date changes

The date changes at midnight in each zone, so the world always has at least two dates in use. Read the dates in the list as well as the times: a city near the bottom can already be on tomorrow while the top rows are still on today. The first inhabited place to reach a new day is Kiritimati, Kiribati, at UTC+14. The last are American Samoa and Niue, at UTC−11. They are 25 hours apart, so for 1 hour each day three calendar dates are in use at once. The International Date Line in the Pacific marks where the date jumps; it bends around island groups so that most island nations keep a single date. Tomorrow’s date lists today’s date from the first place to the last.