Days Between Dates Calculator

Enter a start and end date to see the exact number of calendar days between them, plus a breakdown in weeks and months where helpful. Everything runs locally in your browser — your inputs are not uploaded to produce the result.

The calculator shows the difference between the two dates. Check the on-screen note for whether the count is inclusive or exclusive of endpoints. Calendar date maths accounts for leap years automatically.

Use the Working Days or Business Days calculators to exclude weekends and (optionally) public holidays. Tweak the inputs above to compare options, then copy or note the result you need.

This count includes every calendar day in the span, weekends and holidays included. An off-by-one error usually means you counted both the start and end dates when your rule said not to, or the reverse. Use the on-screen note as the source of truth for this page.

For office SLAs and delivery promises, weekdays or business days are usually what people meant. Leap days are included when they fall between the two dates. Clock-time within a single day belongs on the Time Difference tool.