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Date and time calculators for age, date arithmetic, scheduling, and history
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Calculate exact age from birthdate. Use for years/months/days; for differences use date-calculator. Input: date. Returns age. 100% client-side, files never leave browser.
Calculate the exact number of days, weeks, months, and years between two dates. Handles leap years and varying month lengths correctly.
Count working days (Mon–Fri) between two dates, or add/subtract business days. Leap-year and month-length correct.
Add or subtract days and diff dates. Use for durations; for workdays use business-days-calculator. Input: dates. Returns difference. 100% client-side, files never leave browser.
Find the day of week for any date. Shows weekday name, day-of-year, and leap year status. Uses proleptic Gregorian calendar.
Find the ISO 8601 week number, weekday, day-of-year, and leap-year status for any date.
Add or subtract days and diff dates. Use for durations; for workdays use business-days-calculator. Input: dates. Returns difference. 100% client-side, files never leave browser.
Format dates into ISO, RFC, and locale strings. Use for display formats; for Unix epochs use timestamp-converter. Input: date text. Returns formatted dates. 100% client-side.
Calculate exact age from birthdate. Use for years/months/days; for differences use date-calculator. Input: date. Returns age. 100% client-side, files never leave browser.
Count working days (Mon–Fri) between two dates, or add/subtract business days. Leap-year and month-length correct.
Find the ISO 8601 week number, weekday, day-of-year, and leap-year status for any date.
Calculate the exact number of days, weeks, months, and years between two dates. Handles leap years and varying month lengths correctly.
Find the day of week for any date. Shows weekday name, day-of-year, and leap year status. Uses proleptic Gregorian calendar.