How to Calculate Date

What is Date?

A date calculator adds or subtracts days, weeks, months, or years from a date to find a resulting date. Useful for project deadlines, contract expiration dates, subscription renewals, legal deadlines, and age milestones.

Step-by-Step Guide

1. 1Adding days: count forward from the start date
2. 2Adding months: add to the month number, handle year rollovers and month-end edge cases
3. 3Leap years: divisible by 4 (except centuries unless divisible by 400)
4. 4Business day calculations exclude weekends (and optionally holidays)

Worked Examples