sumivo

Add or Subtract Days

Enter a date and a whole number of days. Use a negative number to subtract days.

01 / INPUTS

days

Enter a positive or negative whole number.

02 / RESULT

RESULT DATE

2026-01-31

Result date
2026-01-31

Calculation trace

  1. 2026-01-01 + 30 days = 2026-01-31
    2026-01-31
    Add days
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SOURCES

  • International Organization for Standardization (ISO)
    ISO 8601 — Date and time format ↗

    Calendar date representation and adding/subtracting days on the proleptic Gregorian calendar

    Accessed 2026-08-19