Dates & Time calculators
Days between dates, ages, time durations and more.
7 calculators, each with the formula, a worked example and sources.
- Age CalculatorExact age in years, months and days, plus your next birthday.
- Business Days CalculatorCount business days between dates, or add business days to a date, skipping US federal holidays.
- Date CalculatorAdd or subtract years, months, weeks and days from any date.
- Days Between Dates CalculatorCount the days, weeks, months and weekdays between two dates.
- Hours CalculatorAdd up hours worked from start and end times, minus breaks, with pay.
- Military Time ConverterConvert between 12-hour (AM/PM) time and military (24-hour) time.
- Time CalculatorAdd or subtract hours, minutes and seconds from a time, or add two durations.