Date, Time & Age
Ages, date differences, business days, durations and time zones, with leap years, month ends and daylight-saving time handled explicitly.
- Age CalculatorCalculate exact age in years, months and days, total months, weeks and days, the weekday of birth and days until the next birthday.
- Date Difference CalculatorFind the difference between two dates in years, months and days, plus total months, weeks and days.
- Days Between Dates CalculatorCount the number of days between two dates, with or without the end date, in weeks, hours and weekend days.
- Working Days CalculatorCount working days (weekdays) between two dates with a configurable weekend, such as Saturday–Sunday or Friday–Saturday.
- Business Days Calculator with HolidaysCount business days between dates excluding weekends and your own list of holidays, or add business days to find a deadline.
- Date Addition CalculatorAdd years, months, weeks and days to a date, with month-end clamping and the weekday of the result.
- Date Subtraction CalculatorSubtract years, months, weeks and days from a date, or count back a number of business days from a deadline.
- Time Duration CalculatorCalculate the elapsed time between two dates and times in days, hours and minutes, total hours and h:mm.
- Hours and Minutes CalculatorAdd and subtract a list of durations in h:mm, “2h 15m”, minutes or decimal hours, with totals in h:mm and decimal.
- Time Addition CalculatorAdd hours and minutes to a clock time and see the resulting time and whether it falls on a later day.
- Time Subtraction CalculatorSubtract a duration from a clock time, or find the difference between two clock times, including across midnight.
- Hours to Decimal CalculatorConvert hours and minutes (h:mm or h:mm:ss) into decimal hours and total minutes for payroll and billing.
- Decimal Hours to Time CalculatorConvert decimal hours (like 7.75) into hours, minutes and seconds (7:45:00).
- Countdown Date CalculatorCount down the days, weeks and months until a target date, including weekdays remaining.
- Day of the Week CalculatorFind the day of the week for any date, its ISO weekday number and day of the year.
- Week Number CalculatorFind the ISO 8601 week number and week-numbering year for a date, the week’s date range and a US-style week number.
- Leap Year CheckerCheck whether a year is a leap year under the Gregorian rule and find the previous and next leap years.
- Days in a Month CalculatorFind how many days, weekdays and weekend days are in any month, and the weekday of its first and last day.
- Days Remaining in the Year CalculatorSee how many days and weekdays remain in the year from a date, and what share of the year has passed.
- Time Zone Conversion CalculatorConvert a date and time between IANA time zones with daylight-saving rules applied, and detect nonexistent or ambiguous local times.
- UTC Offset Comparison ToolCompare local times and UTC offsets for several time zones at one moment, including daylight-saving status.
- Shift Schedule CalculatorGenerate a rotating shift calendar from a repeating pattern and start date, count shifts and look up any date.
- Overtime Hours TrackerTrack overtime across many weeks: weekly overtime above a threshold, totals, averages and overtime pay.
- Workday End-Time CalculatorFind what time your workday ends from your start time, required hours and unpaid breaks.
- Anniversary CalculatorCalculate years since an anniversary date, the next anniversary and days until it, with traditional anniversary themes.