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Date & time

Add days to a date

Add or subtract calendar days and see the resulting date and day of the week.

Free & no registration Calculated in your browser
01

Your inputs

The starting values are an example.

Decimals: 12.5 · Thousands: 1,234.56. Follow the field instructions for lists.

02

Your result

Enter your values and select Calculate.

Your calculation will appear here.

Your result will include the relevant values and units.

Understand the calculation

Formula and example

How it is calculated

Target date = starting date + number of calendar days

Worked example

1 January 2026 plus 30 days is 31 January 2026.

Things to check

  • Negative values subtract days. The calculation uses whole calendar days and is unaffected by daylight-saving clock changes.