Days before date calculator - Number of days from a specific date
This site provides an online "Days Before Date" calculator to help you find the date that occurs exactly X days before a particular date. You can also enter a negative number to find out when X days before that date happened to fall. You can use this tool to figure out a deadline if you have a certain number of days remaining. Or read the full page to learn more about the due date if you're counting business days or weekdays only, skipping Saturday and Sunday.
Note: If you're trying to measure the number of days between two dates, you can switch to the Date Difference Calculator instead.