Date & Time Calculators16 free tools to calculate age (Gregorian & Hijri), date differences, business days, work hours, time zones, ISO week numbers, Unix timestamps, leap years, event countdowns, date format conversion, and more.
Calculate your exact age in years, months, and days from your date of birth — with an automatic Hijri (Islamic) calendar age conversion.
Find the exact age gap between two people in years, months, and days, and see who is older.
Count down the days remaining until your next birthday, and find out what age you'll be turning.
Calculate the exact number of days, weeks, months, and years between any two dates.
Count the actual working (business) days between two dates, excluding weekends and any holidays you list.
Add or subtract a number of days from any date to instantly find the resulting date and its day of the week.
Enter several dates at once and see the days between each consecutive pair, plus the total span from earliest to latest.
Find out instantly which day of the week any date falls on — past, present, or future.
Find the ISO 8601 week number for any date, along with its day of the year and how many weeks that year contains.
Instantly convert any date into 7 common formats — ISO 8601, US, European, dot format, compact, and written long-form.
Find the exact duration in hours and minutes between a start time and an end time, including times that cross midnight.
Calculate total hours worked from clock-in and clock-out times, after subtracting unpaid break time — with an optional pay estimate.
Convert a date and time from one time zone to another, accounting for daylight saving time automatically.
Convert a Unix timestamp to a human-readable date and time, or convert any date and time into a Unix timestamp, instantly.
Check whether any year is a leap year, see why, and find the nearest previous and next leap years instantly.
Count down to any custom date and time — a wedding, deadline, vacation, launch, or any event — with a live, second-by-second countdown timer.