How do I enter a time like 9:15?

Convert minutes to a decimal fraction of 60: 9:15 becomes 9.25.

Time Duration Calculator

Calculate elapsed time between a start and end time given in 24-hour format (as decimal hours), useful for timesheets.

Inputs

Results

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Formula

Duration = End Time − Start Time (wraps past midnight)

Calculating Time Duration Across Midnight, and the Real Leap Year Rule

How to calculate elapsed time when it wraps past midnight, and the three-part rule that actually governs leap years.

Date Difference Calculator

Calculate the number of days, weeks, and months between two dates.

Age Calculator

Calculate your exact age in years, months, and days.

Day of the Week Calculator

Find out what day of the week any date falls on.

Countdown Calculator

Calculate the time remaining until a future date and time.

Leap Year Checker

Check whether a given year is a leap year.

Week Number Calculator

Find the ISO week number for any date.