Free Date & Time Tools
Find out exactly how old someone is, count the days between two dates, add or subtract days, count working days, convert between time zones, and use a stopwatch, countdown or Pomodoro timer.
Date math follows the real calendar, leap years included, and time zones come from your browser's up-to-date time zone database.
29 free tools · No sign-up · Works on phones and computers
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Popular date & time tools
- Age CalculatorExact age in years, months and days, plus your next birthday.
- Days Between DatesCount days, weeks and months between two dates.
- Time Zone ConverterConvert a time between any two time zones, with daylight saving handled.
- Meeting Planner (Time Zones)Find the best meeting time across several time zones at a glance.
- Printable Calendar GeneratorPrint a month or a whole year calendar, starting on Monday or Sunday.
- To-Do List & ChecklistSimple to-do lists and checklists that save in your browser.
All date & time tools
Grouped by what they help you do.
29 tools
- Age CalculatorPopularExact age in years, months and days, plus your next birthday.
- Days Between DatesPopularCount days, weeks and months between two dates.
- Add or Subtract DaysFind the date a number of days, weeks, months or years from any date.
- Business Days CalculatorCount working days between dates, or add working days to a date.
- Day of the Week FinderFind which day of the week any date falls on.
- Week Number CalculatorISO week number for any date, and the dates of any week.
- Time CalculatorAdd and subtract hours, minutes and seconds, or find time between two clock times.
- Leap Year CheckerIs a year a leap year? See why, plus the previous and next leap years.
- Date Format ConverterConvert a date between ISO, US, UK, long, Unix and other formats.
- Time Zone ConverterPopularConvert a time between any two time zones, with daylight saving handled.
- World ClockLive clocks for the cities you choose, side by side.
- Meeting Planner (Time Zones)PopularFind the best meeting time across several time zones at a glance.
- Online StopwatchAccurate stopwatch with laps, keyboard controls and full-screen view.
- Countdown TimerSet a timer for minutes or hours, with an alarm sound when it ends.
- Pomodoro TimerFocus in 25-minute sessions with short breaks, fully customizable.
- Online Alarm ClockSet alarms that ring in your browser, with labels and snooze.
- Study TimerFocus and break sessions per subject, with a log of how long you studied.
- Exam CountdownLive countdowns to all your exams and deadlines, with study days left.
- Presentation TimerA big, colour-changing timer for talks — amber to wrap up, red when time's up.
- Printable Calendar GeneratorPopularPrint a month or a whole year calendar, starting on Monday or Sunday.
- Calendar Invite (.ics) GeneratorCreate a calendar event file for Google, Apple and Outlook calendars.
- Weekly PlannerPlan tasks for each day of the week, tick them off and print it.
- To-Do List & ChecklistPopularSimple to-do lists and checklists that save in your browser.
- Habit TrackerTick off daily habits on a monthly grid and keep your streaks going.
- Assignment PlannerBreak an assignment into dated steps from today to the deadline.
- Class Timetable MakerBuild and print your weekly class timetable for the semester.
- Daily Study PlannerTurn your subjects and hours into a timed study schedule with breaks.
- Project Planner (Gantt Chart)Plan tasks on a simple Gantt timeline with durations and progress.
- Thesis & Dissertation PlannerMilestones from literature review to submission, scheduled back from your deadline.
Date & Time tools: common questions
Do the date calculators handle leap years?
Yes. They use real calendar dates, so February 29 and months of different lengths are handled correctly.
Where do time zone rules come from?
From the IANA time zone database built into your browser, which includes daylight saving time changes.
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