Add or subtract a number of days from any date and get the resulting date and weekday.
Day of the week
Defaults to today.
Give this tool a starting date and a number of days, and it returns the calendar date that many days ahead or behind — along with the weekday it lands on. It counts real calendar days, rolling correctly across month ends and leap years, so "30 days from now" points at the actual date rather than an approximate month. It is the everyday counterpart to a countdown: instead of asking how far away a date is, you name the interval and get the date.
30 days after July 4, 2026 is August 3, 2026 — a Monday. Because July has 31 days, adding 30 lands in early August rather than a round "one month later."
Switch the direction to subtract and enter 10 to step backward: 10 days before July 4, 2026 is June 24, 2026. This is handy for backing into a start date from a known deadline.
Does it count calendar days or business days?
Calendar days — every day counts, including weekends and holidays. To skip weekends and federal holidays, use the business-days calculator instead.
What happens across month and year boundaries?
The date rolls correctly. Adding a day to December 31 gives January 1 of the next year, and February is handled with the right length for the year, including February 29 in leap years.
Why show the day of the week?
Knowing whether a result lands on a weekend often matters more than the date itself — for scheduling deliveries, appointments, or deadlines that only count on weekdays.
Can I use it to count backward from a deadline?
Yes. Set the direction to subtract and enter the lead time; the result is the latest start date that still meets the deadline.