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Add Days to Date Calculator

Add or subtract calendar days, counting weekends and holidays. UTC date arithmetic prevents daylight-saving shifts.

Enter your values

Use a decimal point, without thousands separators.

Example result
Date (YYYY-MM-DD)
2026-11-07

The initial result uses the example values. Enter your own values and calculate again.

Edit inputs

How it works

Add or subtract calendar days, counting weekends and holidays. UTC date arithmetic prevents daylight-saving shifts.

result date = date + calendar days

Worked example

Show example inputs and result

Starting date: October 8, 2026 · Calendar days to add: 30.

Date (YYYY-MM-DD)
2026-11-07

Questions and answers

Why are some results rounded?

Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.

Are my inputs sent to a server?

The calculator processes inputs in your browser. Its code does not send your values to a server.

Method reviewed: October 8, 2026 · Methods & accuracy

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