Date & Time
Age, duration & timezone calculators
Add Days to Date Calculator
Add or subtract a number of days from any date to find the resulting date and its weekday — for deadlines, due dates, reminders, notice windows and contract terms. Enter a start date and a number of days and the calculator returns the new date, the day of the week it falls on, and the signed number of days from where you started. For example, 24 June 2026 plus 30 days is 24 July 2026, a Friday. Switch the unit to weeks, months, years or business days at any time. All the math runs on UTC midnights so adding a day is always a full calendar day — even across a daylight-saving change — and everything is computed in your browser. Choose subtract to step the date backward instead of forward.
Result = start date + n days (computed on UTC midnights, DST-safe)
- 24 Jun 2026 + 30 days = 24 Jul 2026 (Friday)
- Also shown: the weekday and the signed days-from-start distance
Frequently asked questions
What date is 30 days from a date?
Add 30 to the start date. 24 June 2026 plus 30 days is 24 July 2026, which is a Friday. The calculator returns the resulting date and its weekday, and you can switch to weeks, months, years or business days.
How do I subtract days from a date?
Set the direction to subtract and enter the number of days. The tool steps the date backward and shows the earlier date and its weekday — useful for working out a start date from a deadline.