Time & Date Calculators
Ages, durations, and calendar math.
12 free calculators in this category — all run in your browser.
Age CalculatorExact age in years, months, and days, total days lived, and your next birthday.Date Difference CalculatorDays, weeks, and calendar months between any two dates.Time Duration CalculatorHours, minutes, and decimal hours between two clock times — even across midnight.Business Days CalculatorWorking days between two dates, excluding weekends.Date CalculatorAdd or subtract years, months, weeks, and days from a starting date.Time CalculatorAdd or subtract days, hours, minutes, and seconds from a date and time.Hours CalculatorCalculate paid hours and an optional gross pay estimate from a start, end, and break.Time Card CalculatorTotal a Monday–Friday workweek, breaks, regular hours, overtime, and estimated wages.Day of the Week CalculatorFind a date's weekday, day of year, ISO week, and remaining days in the year.Countdown CalculatorCount days to or from an event date, with weeks and inclusive calendar count.Retirement Date CalculatorEstimate the calendar date you reach a chosen retirement age.Time Zone ConverterConvert a date and wall-clock time across common IANA time zones and daylight-saving rules.