CALCULATE / TIMEDROP
Add or subtract days
Find a date a set number of calendar days before or after another date.
Use a negative number to go backward.
YOUR RESULT
2026-10-06
Tue, 6 Oct 2026
Calendar days include weekends and holidays.
HOW IT WORKS
Add or subtract days, explained.
- Enter your starting date.
- Enter a positive number to move forward or a negative number to move backward.
- Read the resulting date and weekday, then copy it.
The starting date is day zero: adding one day moves to the following calendar date. This calculator advances across month lengths and leap years automatically. It counts calendar days, including weekends and holidays.
Does adding 30 days mean one month?
No. Months contain different numbers of days. This tool adds exactly the number of calendar days entered.
What range is supported?
Dates from 1900 through 2100 and shifts of up to 36,500 days in either direction are supported, as long as the result remains inside the date range.
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