How Does It Work?
- Choose the start dateIt defaults to today, so "90 days from today" takes one edit.
- Set the amount and unitDays, working days, weeks, months or years. Months and years keep the same day number where possible.
- Pick a directionAdd to look forward, subtract to look back at when something must have started.
What Is It Used For?
Deadlines are usually expressed as a period rather than a date: 30 days to pay, 14 days to return, 90 days probation. This tool converts that period into the actual calendar date, and tells you the weekday so you can spot a deadline falling on a Sunday.
- Finding the due date of a 30-day invoice.
- Working out the last day of a 14-day return window.
- Setting the end of a probation or notice period.
- Counting forward in working days for a service level agreement.
- Looking backwards to find when a countdown must have started.
Examples
| Start | Move | Result |
|---|---|---|
| 1 Jan 2026 | +30 calendar days | 31 January 2026 |
| 1 Jan 2026 | +30 working days | 12 February 2026 |
| 31 Jan 2026 | +1 month | 28 February 2026 |
| 15 Mar 2026 | −90 days | 15 December 2025 |