DayTally
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Add or subtract days from a date

Enter a start date and a number of days.

  • Exact calendar math · cited sources (EIA, U.S. law)
  • Updated Oct 23, 2026
  • Runs in your browser
  • Methodology
  • Instant answers. Results update as you type, with a visual breakdown.
  • Share or print. Copy a link with your numbers, or print a clean summary.
  • Sourced and private. Exact calendar math · cited sources (EIA, U.S. law). Nothing you enter leaves your device.

Quick answers

Frequently asked questions

Are weekends counted?

Yes, these are calendar days. Use the business days tool to skip weekends.