Does this skip weekends and holidays?

No. This calculator adds calendar days, so weekends and holidays are included. If you need a business-day deadline, count only weekdays or use the Business Days Calculator to find the right number.

Can I subtract days to find an earlier date?

Yes. Enter a negative number in the Days to Add field to move backward from the start date. For example, -7 gives you the date one week earlier.

Due Date Calculator

Calculate a deadline or due date by adding a number of days to a start date.

Due Date Calculator

Calculate a deadline or due date by adding a number of days to a start date.

Start Date*

Enter the start date in YYYY-MM-DD format.

Days to Add*

Number of days from the start date to the deadline.

Real-World Examples

Net 30 invoice

Start 2024-03-01, add 30 days

Due 2024-03-31

Two-week assignment

Start 2024-05-10, add 14 days

Due 2024-05-24

90-day warranty

Start 2024-01-01, add 90 days

Due 2024-03-31

Common Mistakes to Avoid

Counting the start day as day one

Fix: This calculator adds the full number of days to the start date. Adding 1 day to January 1 gives January 2. If your convention counts the start as day 1, subtract 1 from the days to add.

Confusing calendar days with business days

Fix: This calculator adds calendar days, including weekends. If you need a deadline that is N business days out, use the Business Days Calculator and count only weekdays.

Frequently Asked Questions

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