FM 3-03 Chapter 3 · Time and dates
Add and subtract time
Date plus or minus a duration or ISO 8601 period, or N Danish working days, with weekday and ISO week.
Local only Runs in your browser. Nothing you enter leaves this page.
Mode
- Duration
- zero
- Length
- 0 days, 0 s
Years and months are added first, then weeks and days, then hours and minutes. A month added to a day that the target month lacks lands on its last day: 31 Jan + 1 month = 28 Feb (29 in leap years). Times are wall-clock times with no time zone, so a day is always 24 hours.