How it is calculated
A negative number of days rolls the date backward. The count follows the UTC calendar, with no time zones and no daylight saving time.
New date = start date + days
Where the numbers come from
- Date
- Days
Example
January 1, 2026 plus 10 days is January 11, 2026.
Questions
Is the starting day counted as the first?
No. Plus one day is tomorrow, not today.
Working days?
These are calendar days. Weekdays are counted next door.
Can it be subtracted?
Yes, a negative number in the days field.