Count days between dates
Add or subtract days
When a date count needs a quick check
Use this page for deadlines, shipping windows, event planning, billing periods, study plans, and other cases where the exact number of calendar days matters.
If a contract, tax deadline, school policy, or legal document uses business days instead of calendar days, check the official wording before relying on the result.
Common date questions
| Question | What to check |
|---|---|
| How many days until an event? | Use today as the start date. Include the end date only if the event day itself should count. |
| What date is 30 days from now? | Use the add/subtract tool and add 30 calendar days. |
| Is the end date included? | Many informal counts exclude it; rentals, billing periods, and deadlines may use their own rule. |