Our date and time calculators handle the arithmetic that calendars and clocks make surprisingly awkward. Months run 28 to 31 days, leap years add an extra day, and minutes roll over at 60 rather than 100, so mental maths slips easily. This is a small, focused set of five tools covering the jobs people ask about most: counting days to a deadline, totalling hours worked, shifting a date forward or back, and working out an exact age.
If your question is “how long until” or “how long since”, use Days Between Dates. If it is “what date will it be”, use the Date Calculator. For clock times on a timesheet, the Hours Calculator fits; for adding up durations such as lap times or video lengths, use the Time Calculator.
Is the end date included in a day count? A standard count measures the gap between dates, so 1 March to 3 March is two days. If you need both the first and last day counted, as some leave policies require, add one.
How do I turn minutes into decimal hours for payroll? Divide the minutes by 60. Seven hours 45 minutes becomes 7.75 hours.
These date and time calculators are free, run in your browser and need no sign-up.