Add Days to a Date
Choose a start date and a number of days. Use a negative number to go back. The table below also shows common counts from today.
Last updated: 8 November 2026
Add or subtract days
Common day counts from today
| Days | From today | Days ago |
|---|
How to use it
Enter the date to start from — today is filled in for you — and the number of days. A positive number moves forward, a negative number moves back. The start date is day 0: 1 day after Monday is Tuesday. Weekends and public holidays are counted like any other day. If only working days should count, use the business days calculator and its "add business days" mode.
Popular counts
- 30 days from today — return windows, notice periods and free trials.
- 90 days from today — visa-free stays, probation periods and quarterly deadlines.
- 100 days from today — 100-day plans, school countdowns and a baby's 100th day.
- 180 days from today — six-month deadlines and the 90/180 rule window.
Days, weeks or months?
"Within 30 days" and "within one month" are not the same: from 31 January, 30 days later is 2 March, while one calendar month later is the end of February. Legal and financial deadlines usually say which they mean. When in doubt, count days — that is what this tool does. A week is always 7 days, so 6 weeks is 42 days and 12 weeks is 84 days.
Frequently asked questions
- What is 30 days from today?
- See the table above — it is calculated from your device's date.
- Does the count include today?
- No. Today is day 0, so 1 day from today is tomorrow.
- How do I subtract days?
- Enter a negative number, for example −45.
- Can I skip weekends?
- Use the business days calculator, which skips weekends and optional public holidays.