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Time, Date &
Time Zone Tools
Fast, accurate and free tools for time zones, dates, calendars and everyday time calculations. Nothing to install, no account needed.
Popular searches: New York London Tokyo UTC Time Zone Converter
Popular tools
View all tools →- Time Zone Converter Convert a time between cities, with daylight saving handled for you.
- World Clock Live local time in as many cities as you need.
- Date Difference Calculator Days, weeks, months and hours between two dates.
- Age Calculator Exact age in years, months, days — and the next birthday.
- Countdown Timer Count down to any date and time, in any zone.
- Stopwatch Precise stopwatch with laps and keyboard control.
- Week Number ISO week number for any date, plus a full-year table.
- Business Days Calculator Working days between dates, minus weekends and holidays.
Time around the world
View all →Time zone guide
- Time Zone DirectoryAbbreviations, offsets and current time for every major zone.
- Clock Change DatesWhen each time zone next moves its clocks, and by how much.
- UTC TimeThe UTC reference clock with ISO and Unix values.
Learn about time
- Leap Year CalculatorCheck whether a year is a leap year, and why.
- Week NumberISO week number for any date, plus a full-year table.
- Unix Timestamp ConverterLive epoch clock and conversion both ways.
Time tools
- World Clock Live local time in as many cities as you need.
- Time Zone Converter Convert a time between cities, with daylight saving handled for you.
- Time Difference Calculator How many hours ahead or behind two places are, right now.
- Meeting Planner Find an hour that works across several time zones.
- Event Time Announcer Announce one moment in every attendee’s local time.
- UTC Time The UTC reference clock with ISO and Unix values.
- Time Zone Directory Abbreviations, offsets and current time for every major zone.
- Clock Accuracy Check See how far your device clock differs from server time.
- Day & Night Map Where the sun is up right now, with a 24-hour scrubber.
- Distance Between Cities Great-circle distance, bearing and rough travel times.
- Clock Change Dates When each time zone next moves its clocks, and by how much.
Date tools
- Calendar Monthly calendar with week numbers, holidays and notes.
- Year Calendar All twelve months on one printable page.
- Date Calculator Add or subtract days, weeks, months and years from a date.
- Date Difference Calculator Days, weeks, months and hours between two dates.
- Age Calculator Exact age in years, months, days — and the next birthday.
- Business Days Calculator Working days between dates, minus weekends and holidays.
- Week Number ISO week number for any date, plus a full-year table.
- Day of the Week What day any date falls on, past or future.
- Leap Year Calculator Check whether a year is a leap year, and why.
- Holiday Calendar Public holiday lists by country and year.
- Time Calculator Add or subtract hours and minutes from a date and time.
- Time Duration Calculator How long between two times, in hours, minutes and decimal hours.
- Timesheet Calculator Weekly work hours with breaks, overtime and decimal totals.
- Workdays Calculator Count forward or back a number of working days from a date.
Timers
- Countdown Timer Count down to any date and time, in any zone.
- Online Timer One or many timers with presets and an alarm.
- Stopwatch Precise stopwatch with laps and keyboard control.
- Alarm Clock Set an alarm for a clock time, with repeat days and a sound.
- New Year Countdown Time left until the new year, and who reaches it first.
- Pomodoro Timer Focus sessions with breaks, a counter and a daily log.
- Sleep Calculator Bedtimes and wake times aligned to whole sleep cycles.
Developer tools
Astronomy
- Sunrise & Sunset Sunrise, sunset, day length and twilight for a month.
- Moon Phases Current moon phase and the month’s principal phases.
- Golden Hour Calculator Golden and blue hour windows for photographers, by location.
- Moonrise & Moonset Moonrise, moonset, phase and illumination for a whole month.
- Seasons Calculator Equinox and solstice times for any year, in your time zone.
Why use these tools
- No sign-up Every tool is free
- Accurate IANA time zone data
- Private What you type stays in your browser
- Works everywhere Desktop, tablet and phone
- Light and dark Follows your system
- Works offline Pages are cached for you
Popular city times
Frequently asked questions
Is UnixClock free?
Yes. Every clock and calculator on the site is free and works without an account. Preferences such as your saved cities are stored in your own browser.
How accurate is the clock?
The clock is read from your device and formatted with your browser’s time zone database, so it is exactly as accurate as your device clock. It is not synchronised with an atomic or network time server.
Does it handle daylight saving time?
Yes. Every conversion uses IANA time zone identifiers such as America/New_York, so daylight saving transitions are applied automatically rather than assumed from a fixed offset.
Do the tools work offline?
Once a page has loaded, the calculators, stopwatch, timer and calendar keep working without a connection. Datasets such as the city list need one initial load.