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Add / Subtract Days

Add or subtract calendar days from a date without time-zone drift.

Private-first · runs on your device Ready
2026-10-29Use a negative number to subtract calendar days.

How it works

Add / Subtract Days is designed to give you the result immediately. The calculation or processing happens on your device for this tool, so normal use does not require an account or a file upload.

Privacy

This tool is marked offline-capable. Your inputs are used in the current browser/app session and are not required to be sent to Wiunix Tools to perform the operation.

Add or subtract calendar days without time-zone drift

Enter a date and a positive or negative number of days. The calculation uses calendar-day arithmetic instead of elapsed local hours, avoiding DST-related one-hour surprises.

  • Positive or negative day offsets
  • Calendar-day arithmetic
  • Month/year rollover
  • DST-safe date math