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Time Zone Converter & Meeting Planner

A time in several time zones, a meeting planner and military time.

Free tools that run in your browser. Nothing you type, open or create is uploaded to NerdBible or anyone else.

    Offsets and daylight saving dates come from your browser's own time zone database, so they follow the official rules for the date you pick. Your list of time zones is remembered in this browser only.

    How to use it

    1. Choose the time zone the time is in, then the date and time, or leave Use the current time ticked for a live clock.
    2. Add the cities or time zones you need. Each row shows the local time, the date and the offset from UTC.
    3. Open Meeting planner, pick 2 to 6 of your time zones and set the working hours. Hours that fall inside working hours everywhere are marked; click one to convert it.
    4. Open Military time to turn 1430 into 2:30 pm or the other way round, with the way it is spoken.

    Questions

    Does the converter handle daylight saving time?

    Yes. It works out each zone's offset for the exact date and time you choose, so a meeting in late March or late October shows the right times even when the clocks change on different dates in Europe and North America.

    Why are some offsets 30 or 45 minutes?

    Some places, such as India (UTC+5:30), Newfoundland (UTC−3:30) and Nepal (UTC+5:45), set their clocks to a half or quarter hour. The converter shows these exactly.

    What happens to a time that does not exist?

    When clocks go forward an hour is skipped, so a time such as 2:30 on that night does not exist. The converter moves it forward by the size of the jump and says so.

    How does the meeting planner choose good hours?

    For each hour of the day in the planning time zone, it checks the local hour in every zone you picked. An hour is marked as good for everyone only when it falls inside the working hours you set in all of them. Change the working hours if your teams start early or finish late.

    What is military time?

    The 24-hour clock written as four digits with no colon: 0000 is midnight, 0900 is 9 am, 1300 is 1 pm and 2359 is one minute before midnight. It is said as hours, such as fourteen thirty hours for 1430, and zero nine hundred hours for 0900.

    Is midnight 0000 or 2400?

    Both appear. 0000 marks the start of a day and is what most systems use; 2400 is sometimes used for the end of a day, such as a shift that runs until midnight. The converter accepts 2400 and treats it as midnight at the end of the day.

    Why use city names rather than abbreviations like EST?

    Abbreviations are ambiguous (CST is used in the US, China and Cuba) and do not say whether daylight saving applies. A zone named after a city, such as America/Chicago, always gives the right local time.

    About this tool

    About the time zone converter

    Scheduling a call across London, New York and Singapore is error-prone in your head. Add the cities you need and see one moment in all of them at once, each with its local time, date and offset from UTC.

    Three tabs

    • Converter: choose the time zone the time is in, then the date and time, or keep the live clock. Your list of cities is remembered in this browser.
    • Meeting planner: pick 2 to 6 of your zones and set the working hours. A 24-hour grid marks the hours that fall inside working hours in every zone, with the hours just outside shaded lighter. Click an hour to convert it.
    • Military time: turn 1430 into 2:30 pm or 9am into 0900, with the way it is spoken and a full chart.

    Daylight saving, handled

    Europe and North America change their clocks on different dates, so for a few weeks each spring and autumn the gap between them shrinks or grows by an hour. The converter works out each zone's offset for the exact date you choose, using your browser's own time zone database. When a time does not exist because clocks went forward, it is moved forward and the page says so.

    Why city names, not EST or CST?

    Abbreviations are ambiguous: CST is used in the US, China and Cuba, and none of them say whether summer time applies. A zone named after a city, such as America/Chicago, is always right.

    Odd offsets

    India is UTC+5:30, Newfoundland UTC-3:30 and Nepal UTC+5:45. These are shown exactly, in the converter and in the planner.

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