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Date & Time

Work with dates, durations, business days, ISO weeks, timers and time zones while keeping calendar and daylight-saving rules visible.

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Age Calculator Find your exact age in years, months and days — plus weeks, next birthday and zodiac sign. Business Days Calculator Working days between two dates — your weekend, your holidays. Countdown Timer Set it, start it, hear it — and it keeps time in a background tab. Date Difference Calculator How long between two dates — in years and months, or in plain days. Day of the Week Calculator Find the weekday for any past or future date. Military Time Converter Convert military and standard time in either direction. Pomodoro Timer Focus, break, repeat — and it keeps track of where you are in the cycle. Stopwatch Count up, with laps — and it does not lose time when you look away.

Time Zone Converter One moment, in every zone you care about — with the date shift named. Week Number Lookup Find the ISO week number and its Monday-to-Sunday dates.

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About this collection

Calendar and clock calculations with the edge cases included

Dates are not simple decimal numbers. Months have different lengths, leap years add a day, ISO weeks can belong to a neighboring calendar year, and a time-zone conversion can cross midnight. These tools use calendar-aware operations so an exact age, date interval or weekday is calculated from real calendar boundaries rather than an average number of days.

Time-zone results use the rules available in your browser, including daylight-saving transitions. Future government rule changes and historical local-time conventions can still affect an answer, so verify a time separately when a legal deadline, journey or live event depends on it.

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