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Dates, durations, and time zones.
Age
Calculate exact age in years, months, and days from a date of birth, plus total months, weeks, and days, and how long until the next birthday.
Open tool →Duration
Count the days between two dates, and see the difference in years, months, weeks, weekdays, hours, and minutes.
Open tool →Date maths
Add or subtract days, weeks, months, and years from a date to find a deadline, due date, or anniversary.
Open tool →Work days
Count working days between two dates, or add working days to a date, skipping weekends and US or UK public holidays.
Open tool →Weekday
Find the day of the week for any date, past or future, plus its day of the year, ISO week, and quarter.
Open tool →ISO week
Find the ISO 8601 week number for any date, with the week's Monday-to-Sunday dates, the US week number, and every week of the year.
Open tool →Calendar
Check whether a year is a leap year, see why, and list the leap years before and after it.
Open tool →Timer
Count down to any date and time — a launch, holiday, or your next birthday — in days, hours, minutes, and seconds.
Open tool →Time zones
Convert a date and time between any time zones, with daylight saving time handled automatically, plus flight arrival times in local time.
Open tool →Clock
See the current time in cities around the world, with the date, time zone, and difference from your local time. Your list of cities is remembered.
Open tool →Scheduling
Find a meeting time that works across time zones: see every participant's local time hour by hour, with working hours highlighted.
Open tool →Epoch
Convert Unix timestamps to dates and dates to timestamps, in seconds, milliseconds, microseconds, or nanoseconds, with the current epoch time live.
Open tool →Formats
Convert dates between ISO 8601, RFC 2822, US and European formats, Unix timestamps, and custom patterns. Paste a list to convert many at once.
Open tool →Timing
A precise online stopwatch with lap times, fastest and slowest laps highlighted, keyboard shortcuts, and CSV export.
Open tool →Alarm
Set a countdown timer or an alarm for a time of day, with a sound, an optional desktop notification, pause, and snooze.
Open tool →Focus
A Pomodoro timer for focused work: 25-minute sessions with short and long breaks, sounds, notifications, and a daily count.
Open tool →Printable
Make a printable monthly or yearly calendar for any year, with week numbers, a Monday or Sunday start, and US or UK public holidays.
Open tool →.ics
Create a calendar invitation (.ics file) with a video meeting link, reminder, repeat rule, and guests, plus an Add to Google Calendar link.
Open tool →Planner
Plan your week day by day: add tasks to each day, tick them off, keep weekly notes, and print the week. Saved in your browser.
Open tool →Tasks
A simple to-do list with multiple lists, daily and weekly recurring tasks, paste-in checklists, and Markdown export. Saved in your browser.
Open tool →Habits
Track daily habits with a tick for each day, current and best streaks, and your 30-day completion rate. Saved in your browser.
Open tool →Notes
A private notepad in your browser: write notes in plain text or Markdown, search them, preview formatting, and export as .md files.
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