Exact duration between two dates and times.
Enter the start and end date+time — the calculator computes the exact difference and breaks it down into days, hours, minutes and seconds, plus whole-unit totals (total hours, total minutes, etc.).
Both date+time inputs are read in your browser's local time zone, so the duration is correct as long as both the start and end are meant in that same local time.
The Date Calculator adds or subtracts a number of days/weeks/months/years from a single date. This one measures the exact elapsed duration — down to the second — between two specific date-and-time instants.