Business days count Monday to Friday and do not skip public holidays.
Need the date 365 days from now? The result appears with its weekday as soon as the page loads. 365 days is 52 full weeks plus 1 day; from January 1, 2027 it gives Saturday, January 1, 2028. Switch to business days to skip weekends.
How to use
- Pick a tab: Between dates, Age, or Add / subtract.
- Choose the dates with the date pickers, or tap Today to fill in today’s date.
- Results update as you type. Tap any result row to copy it.
- Use the quick picks for holiday countdowns or common offsets like +30 or +90 days.
- By default the end date is not counted (Jan 1 → Jan 2 is 1 day). Turn on “Include end date” to count both days.
- Business days are Monday to Friday. Public holidays are not excluded because they differ by country.
- Adding months keeps the day of the month when it exists and otherwise uses the last day of the month: Jan 31 + 1 month = Feb 28 (or Feb 29 in a leap year).
- Age is counted in completed years, months and days. If you were born on February 29, your birthday is counted on February 28 in common years.
- Dates are shown in your language’s format. Nothing you enter leaves your device.
Adding days, weeks and months
Days and weeks are exact: 90 days after November 1, 2026 is Saturday, January 30, 2027. Months follow the calendar, so the day of the month stays the same when it exists and otherwise moves to the last day of the month: January 31 plus 1 month is February 28, or February 29 in a leap year.
Years work the same way, so February 29, 2028 plus 1 year is February 28, 2029.
Business days and deadlines
Business days skip Saturdays and Sundays: 10 business days after a Monday is the Monday two weeks later. Public holidays are not skipped, because they differ by country. For legal or contractual deadlines, check how your rules count the first day and whether a deadline that lands on a weekend moves to the next working day.
Frequently asked questions
What date is 90 days from today?
Open the page and pick +90, or type 90 days. The answer appears with its weekday; from November 1, 2026, for example, it is January 30, 2027.
How do I subtract days from a date?
Switch the operation to minus and enter the number of days, weeks, months or years. The result shows the earlier date and its weekday.
What happens when I add a month to January 31?
The calculator uses the last day of the shorter month, so January 31 plus 1 month is February 28, or February 29 in a leap year.
Can I add business days only?
Yes. Choose business days and weekends are skipped. Public holidays are not removed, so add them yourself if needed.
Is 30 days the same as one month?
Not exactly. Months have 28 to 31 days, so 30 days after January 31 is March 2 in a common year, while one month later is February 28.