ECECHWEB APP OS

Add or Subtract Days, Weeks, Months or Years

Date calculator calendar with controls to add or subtract days, months, or years.
START · 1 OF 3

Choose a starting date and whether to add or subtract time.

DESTINATION DATE

28 February 2026

Saturday · 2026-02-28

Direction
Add
Net calendar change
+28 days
Month-end rule
Clamped to the last valid day of the month

Working-day mode counts Monday through Friday and excludes public holidays. Month arithmetic clamps to the last valid day and is not always reversible.
▣How to use this tool›

How to Add or Subtract Days From a Date

  1. Choose a starting date and whether to add or subtract time.
  2. Enter any mix of years, months, weeks and days; the tool applies years and months before days.
  3. Review the resulting weekday and the working steps, including any month-end clamp.

Example

31 January plus one month becomes 28 February (29 in a leap year). Subtracting one month from 28 February then gives 28 January.

?About the result›

Working-day mode counts Monday through Friday and excludes public holidays. Month arithmetic clamps to the last valid day and is not always reversible.