Date Difference and Math

Calculate the number of days between two dates, with exclusive or inclusive counting, weeks, calendar years/months/days and weekday/weekend totals.

Add or subtract calendar days from a start date, then see the resulting date, weekday, ISO week, day of year and month calendar.

Add years, months, weeks, days, hours, minutes and seconds to a start date and time, then see the resulting date-time and total offset.

Subtract years, months, weeks, days, hours, minutes and seconds from a start date and time, then see the resulting past date-time.

Calculate the date difference between two dates or add and subtract calendar days from a start date, with full calendar breakdowns.

Calculate full weeks, remaining days, total days and decimal weeks between two dates, with optional inclusive end-date counting.

Calculate full calendar months and remaining days between two dates, with decimal months, total days, weeks, quarters and year breakdowns.

Calculate the elapsed hours and minutes between two date-times, with total hours, total minutes, seconds, decimal hours, days and 8-hour shift estimates.

Add and subtract time durations in HH:MM:SS, HH:MM or unit format, with decimal hours, total minutes, total seconds and copyable results.

Calculate duration between a start and end time or between two date-times, with optional break deduction, overnight shifts, decimal hours and night-minute reference.

Find the calendar date a number of days ago or days from a chosen date, with weekday and exact date output.

Calculate how much time has passed since a date and time, with live years, months, days, hours, minutes and seconds.