Date & Time Calculators
Date arithmetic is easy to get wrong by hand: month lengths, leap years and time zones all get in the way. These calculators give exact answers for the common questions.
Which tool do you need?
- How old am I in years, months and days?Age Calculator
- How many days between two dates?Date Difference Calculator
- How many days until an event?Days Until Date Calculator
- What day of the week was that date?Day of the Week Calculator
- What time is it in another country?Time Zone Converter
- How long did this take?Time Duration Calculator
Dates
Age Calculator
Calculate your exact age in years, months and days from your date of birth, plus total days lived and days until your next birthday.
Open toolDate Difference Calculator
Find the number of days, weeks, months and years between two dates, count business days, or add and subtract days, weeks, months or years from a date.
Open toolDays Until Date Calculator
Count down the days, hours, minutes and seconds to any date, with presets like New Year and Christmas. Share the countdown with a link; nothing is stored.
Open toolDay of the Week Calculator
Find the day of the week for any date from year 100 to 9999, plus the day of the year, ISO week number, leap year status and days left in the year.
Open toolPrintable Calendar Maker
Make a free printable calendar for any year: whole year on one page or one month per page, Sunday or Monday start, week numbers. Print or save as PDF. Nothing uploaded.
Open toolTime
Time Duration Calculator
Add or subtract time durations in hh:mm:ss, sum a list of durations for timesheets, and convert between h:mm:ss and decimal hours. Free and private.
Open toolTime Zone Converter
Pick a date and time in any IANA time zone and see it in several other zones at once. Daylight saving aware, with 12 or 24-hour display. Free, private.
Open toolWorld Clock
See the live current time in any cities or time zones you choose, with date, UTC offset and hours difference from you. Your list is saved in your browser.
Open toolStopwatch & Countdown Timer
A free online stopwatch with lap times and a countdown timer with presets and an alarm beep. Accurate, timestamp-based timing that works in your browser.
Open toolAbout these tools
Date arithmetic is easy to get wrong by hand: month lengths, leap years and time zones all get in the way. These calculators give exact answers for the common questions.
Work out how old someone is, how many days remain until an event, how long a task took, or what time it is in another city.
Frequently asked questions
Do the calculators handle leap years?
Yes. They use the real calendar, including leap years and varying month lengths.
How do I find the number of days between two dates?
Enter the start and end dates in the date difference calculator. It shows the total days and the breakdown in years, months and days.
See all calculators or browse every free tool.