Date Adder & Subtractor Calculator — ZYCalculator

A date calculator adds or subtracts days, weeks, months, years, or business workdays from any reference calendar date to find future or past target dates.

Formula & Method

Target Date = Base Date ± (Years + Months + Weeks + Days) [ISO 8601]

How to Use

  1. Pick Starting Date: Select reference calendar date.
  2. Choose Add or Subtract: Specify whether to advance into future or look back into past.
  3. Enter Intervals & Filter Weekends: Add years, months, weeks, days, or enable business workdays mode.

Frequently Asked Questions

How do I add or subtract business days from a date?

Select your starting reference date, enter the number of days or weeks, and enable "Count Only Business Working Days". The calculator skips all Saturdays and Sundays to find the exact target deadline.

How to add calendar intervals to a date?

Input your reference date and enter the exact number of years, months, weeks, or calendar days to add or subtract to find the target date.