Time & date tools
Convert, count and plan across calendars and time zones — every tool runs instantly in your browser.
Most popular
Age Calculator
Exact age in years, months and days, plus next birthday.
popular
Countdown Generator
Live countdown to any date, with a shareable link.
popular
Countdown Timer
Set a duration and count down to zero with an alarm.
popular
Date Difference Calculator
Days between dates, or add and subtract time from a date.
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Meeting Planner
Find meeting hours that work across multiple time zones.
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Online Alarm Clock
Set an alarm for a clock time, with a sound.
popular
Online Stopwatch
Start/stop stopwatch with lap and split times.
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Pomodoro Timer
Focus timer with work and break rounds.
popular
Sun & Moon Almanac
Twilights, golden hour, moon phase, rise and set — anywhere.
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Sunrise & Sunset Calculator
Sunrise, sunset, twilight and day length for any place.
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Time Zone Converter
Convert a date and time between any IANA time zones.
popular
Working Days Calculator
Business days between dates, with your own holidays.
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World Clock
Live clocks for cities around the world.
Timers & Clocks
Countdown Timer
Set a duration and count down to zero with an alarm.
popular
Online Alarm Clock
Set an alarm for a clock time, with a sound.
popular
Online Stopwatch
Start/stop stopwatch with lap and split times.
popular
Pomodoro Timer
Focus timer with work and break rounds.
popular
World Clock
Live clocks for cities around the world.
Military Time Converter
Convert between 12-hour and 24-hour (military) time.
Time Zones & Meetings
Date Arithmetic
Age Calculator
Exact age in years, months and days, plus next birthday.
popular
Date Difference Calculator
Days between dates, or add and subtract time from a date.
popular
Working Days Calculator
Business days between dates, with your own holidays.
Week Number Lookup
ISO week number and day-of-year for any date.
Sun & Daylight
Generate & Convert
About these tools
Time and date tools for scheduling across the globe and doing calendar math without off-by-one mistakes: time zone conversion, meeting planners, date difference and workday calculators, countdowns, age calculation and week numbers. Daylight saving rules and leap years are handled for you.