Add / Subtract Date Calculator
Add or subtract days, weeks, months or years from a date — with an optional business-days mode.
Calculated locally in your browser using your device's date and time.
- Add or subtract in days, weeks, months or years without counting on a calendar.
- Business-days mode skips weekends, plus any holidays you list, for deadlines specified in working days.
- Shows the resulting date and which day of the week it lands on.
- Runs in your browser.
Why this is private
- Calculated locally in your browser using your device's date and time.
- Open your browser's DevTools → Network tab while using this tool — you won't see a request carrying your input, because it never leaves your device.
- Nothing you enter is uploaded to a server or shared with us — the processing happens entirely on your device.
Overview
Adds or subtracts a number of days, weeks, months or years from a given date — or switch to business days to skip weekends (and any holidays you list) as it counts.
How to use it
- 1Enter a starting date.
- 2Enter the amount and unit to add or subtract, or check "Count business days" and optionally list holidays to skip.
- 3View the resulting date.
Frequently asked questions
What people use it for
Find a due date specified in business daysA 5-business-day notice period or a net-10-business-days invoice term — check business-days mode so weekends aren't counted.
Find a due date in calendar daysAdd 90 days to an invoice date, or 40 weeks to a start date.
Work out a deadline from today"What date is 45 days from now" for a returns window or notice period.
Back-date a startSubtract a probation or lead time from a target date.
Plan a recurring milestoneStep forward by months to find each review or renewal date.
Related tools
All date & time toolsDate Difference CalculatorCalculate the number of days, weeks or months between two dates — or just business days.Age CalculatorCalculate exact age in years, months and days from a birth date, plus the total in weeks, hours, minutes and seconds.Day of the Week FinderFind what day of the week any date falls on.Timezone ConverterConvert a time between two or more timezones at once.
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Add / Subtract Date Calculator