Date & Time Calculators — Free Online Tools
Age, date difference, working days, countdown, and time zone tools. Work out exact ages, count business days, convert time zones, and build live countdowns in a click.
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Age Calculator
Free age calculator. Enter your birth date to instantly see your exact age in years, months, and days plus the next birthday countdown.
OpenDate Difference Calculator
Free date difference calculator. Enter two dates to find the exact span between them in years, months, weeks, days, hours, and minutes.
OpenDays Between Dates
Free days between dates calculator. Quickly find exactly how many days are between any two calendar dates, including today.
OpenWorking Days Calculator
Free working days calculator. Count business days between two dates, excluding weekends and optional holidays, for accurate project planning.
OpenTime Zone Converter
Free time zone converter. Convert a time from any city or time zone to another, with automatic offset handling for major world time zones.
OpenWeek Number Calculator
Free week number calculator. Find the ISO week number for any date, plus how many weeks into the year that date falls.
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Countdown Calculator
Free countdown calculator. Pick a target date and see exactly how many days, hours, minutes, and seconds remain until the big moment.
OpenDay of the Week Calculator
Free day of the week calculator. Enter any date to instantly find what day of the week it fell on — from any year, past or future.
OpenAbout Date & Time Calculators
Dates are easy to miscount by hand. Our 8 free date and time calculators take the arithmetic out of calendars and clocks: exact age in years/months/days, the precise span between two dates, business-day counting that skips weekends, week-number lookups, day-of-week identification, and fixed time-zone conversions.
Planning a project deadline, verifying a contract window, or working out how long until a launch? Enter your start and end dates and the tool handles leap years, month lengths, and weekend exclusions automatically — no spreadsheet gymnastics required.
The time-zone converter and countdown tools are handy for remote meetings and event launches. Everything calculates client-side and in seconds, so you get the answer before your tab finishes loading.