Date & Time
Calculate dates, durations, timestamps, and time zones.
Date Calculations
Age CalculatorCalculate age in years, months, and days between a birth date and reference date, along with the days until the next birthday.Date Difference CalculatorCompare two dates to see the elapsed day count and the equivalent calendar years, months, and days.Add/Subtract DatesMove a date forward or backward by a chosen number of years, months, weeks, or days.Business Days CalculatorCount business days between two dates using your selected weekend days and excluded dates; the end date is not counted.Time Duration CalculatorFind the elapsed hours and minutes between two date-and-time values, including intervals that cross midnight.Week Number CalculatorFind the ISO-8601 week number, week-based year, and weekday for a selected date.
Time Zones & Clocks
Unix Timestamp ConverterConvert between a date and time and a Unix timestamp, choosing seconds or milliseconds.Time Zone ConverterConvert a date and time between selected time zones using the browser’s available time-zone data.World ClockShow current times for the time zones you add, with controls to add or remove clocks.