Add / Subtract Date

Move any date forward or backward by days, weeks, months, or years. Get the result date with day of the week.

Result Date
Day of the Week

How to Use

  1. 1

    Set a Base Date to start from.

  2. 2

    Enter the Amount and choose Add or Subtract.

  3. 3

    Select a Unit (days, weeks, months, or years) and click Calculate Date.

  4. 4

    View the resulting date, formatted date, and day of the week.

How It Works

Days / Weeks
Base Date ± (Amount × unit in days)
Months
Base Month ± Amount (clamped to valid day)
Years
Base Year ± Amount (Feb 29 → Feb 28 if needed)

Calendar rules are applied automatically for month length and leap years.

Examples

Invoice deadlines

Add 30 days to issue date for due date tracking.

Result: faster billing operations.

Warranty periods

Add one year from purchase date.

Result: clean warranty cutoff dates.

Retrospective analysis

Subtract 90 days to analyze previous quarter.

Result: repeatable reporting windows.

FAQ

Calendar rules are applied automatically for month length and leap years. Adding 1 month to Jan 31 gives Feb 28 (or 29 in a leap year).
Use the selected unit per calculation; rerun with the result as a new base date to chain multiple operations.
Yes. You can enter a negative amount or use the Subtract operation to move the date backward.

Related Calculators

Days Between Dates
Exact day difference
Age Calculator
Exact age breakdown
Workday Calculator
Business days counter

Quick Tip

Net 30, Net 60, and Net 90 are common invoice payment terms. Use this tool to quickly find exact due dates from any issue date.

Common Offsets

Net 30 +30 days
Net 60 +60 days
1 quarter +3 months
1 fiscal year +12 months