Add or subtract days
Jump a date forwards or backwards. Try +7 or +14 from the chips, then open the matching month calendar.
Enter a date and a whole number of days. Negative numbers move into the past.
Saturday 19 September 2026
That date is a Saturday in ISO week 38.
Date: 2026-09-19
Weekday: Saturday
ISO week: 38
How this works
Positive numbers move forwards; negative numbers move backwards. The result is a Gregorian calendar date you can open as a month page.
Other tools: Days between two dates Working days calculator Days until a date Week number calculator Leap year checker Age calculator Date-to-date countdown Unix timestamp converter