Age, date and time calculators. — 30 free tools.
Calculate exact age in years, months, weeks, days, hours and seconds, with zodiac sign, birthstone and next-birthday countdown.
★Calculate the difference between two dates or add/subtract days, weeks, months and years, with business-day and holiday options.
★Add or subtract hours, minutes and seconds, find duration between times, and calculate work hours and pay.
★Count the days, weeks and hours until (or since) any date.
★Count business days (excluding weekends) between two dates.
★Find the best bedtimes based on 90-minute sleep cycles and your wake time.
★Check whether any year is a leap year and find the next one.
★Find the number of days, weeks and months between two dates.
★Calculate exact age in years, months and days.
★Add or subtract days from a date.
★Add or subtract weeks from a date.
★Add or subtract months from a date.
★Count working days between two dates.
★Find the ISO week number for any date.
★Count down the days until a future date.
★Find the duration between two times.
★Add hours and minutes to a time.
★Add up multiple time spans into total hours.
★Count down to a date and time.
★Find which day of the week a date falls on.
★Check whether a year is a leap year.
★Find your astrological zodiac sign from your birthday.
★Find your Chinese zodiac animal by birth year.
★See your age on other planets.
★Convert worked hours into pay at an hourly rate.
★Calculate hours worked from clock-in and clock-out, minus a break.
★Find out how many days, hours and minutes you have been alive.
★Find your retirement date and time remaining.
★Find how long since a special date and the next anniversary.
★Convert a time across two UTC offsets.
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Author: CalculatorFC Editorial Team
Reviewed by: CalculatorFC Accuracy Review Desk
Last updated: June 23, 2026
Editorial policy: We explain formulas, assumptions, limitations and examples in plain language and update pages when methods, rates or standards change.
Fact-checking policy: Calculator formulas are reviewed against standard mathematical, financial, scientific or public reference methods where applicable.
Sources: Standard formulas, official government references where relevant, public methodology references and calculator-specific documentation.
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