29 free tools · Date & Time
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.
Use them as often as you like — free, with no sign-up and no daily limits.
- Free
- No sign-up
- Phone & computer
- Date calculators9
- Time zones & clocks3
- Timers7
- Planners & organisers10
29 tools
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 CalculatorPopularCount working days between dates or add business days to a deadline — US and UK holidays built in, any work week.
- 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 guides
Step-by-step help that goes with these tools.
- Guide · Date & TimeHow Long Is 3–5 Business Days? Charts for Every Common Range3–5 business days is 3 to 7 calendar days. See exactly when 2–8, 5–7, 7–10 and 10–15 business days end for every order day, and how holidays shift them.Oct 8, 2026 · 7 min read
- Guide · Date & TimeHow to Calculate Business Days Between Two DatesCount working days by hand or in Excel, add business days to a deadline, and handle observed and substitute holidays — with 2026 working days per month for the US and UK.Oct 7, 2026 · 7 min read
Date & Time
Common questions
Quick answers about these free tools.
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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