Add a number of days to a starting date to find the resulting date and day of the week.
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This tool takes your starting date and moves forward by the exact number of days you specify, automatically handling month-end rollovers and leap years, then reports the resulting calendar date and its day of the week.
This is useful for calculating deadlines (e.g. 'net 30' payment terms), shipping or delivery estimates, warranty expiration dates, or any situation where you need to project a date a fixed number of days into the future.
Adding 45 days to July 1, 2026 gives August 15, 2026, a Saturday, crossing over both the end of July (31 days) into August seamlessly, exactly the kind of month-boundary rollover this tool handles automatically.
Confusing calendar days with business days, adding 30 days to a date includes weekends in that count, if you need '30 business days from now,' use the Working Days Calculator's logic in reverse instead.
Assuming the day of the week shifts predictably (like always landing on the same weekday), unless the number of days added is a multiple of 7, the resulting date falls on a different day of the week than the start date.
Forgetting a 'net 30' or similar payment term typically counts from the invoice date itself as day zero, double-check whether your specific contract counts the start date as day 1 or day 0 before relying on the exact resulting date.
Yes, you can add any number of days, including spans of multiple years, the calculator handles leap years automatically.
Use our Subtract Days Calculator to move a date backward by a number of days instead.
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