Date Add/Subtract Calculator
Add or subtract days, weeks, or months from any date. Free online date calculator, no signup required.
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What Is the Date Add/Subtract Calculator?
Adding or subtracting days from a date is needed for contract deadlines ('delivery within 45 days'), medical appointments ('follow up in 6 weeks'), legal timeframes ('file within 90 days'), and project planning. This calculator handles the complexity of variable month lengths, leap years, and calendar math that makes manual date arithmetic error-prone.
For more date calculations, try our Date Calculator for durations between dates, or the Age Calculator to find exact age breakdowns.
Practical Tips
- Lease renewal notices typically require 60 or 90 days before the lease end date. Add -60 days from your lease expiration to find your notification deadline — missing it can mean automatic renewal at a higher rate.
- Passport renewal processing takes 6-8 weeks (routine) or 2-3 weeks (expedited). Add 56 days to today to find the latest date you can submit a routine application before a trip.
- 90-day probation periods at new jobs are calendar days from your start date. Add 90 days to know exactly when your benefits eligibility, review date, or PTO accrual changes kick in.
Related Date Tools
All calculations run in your browser using JavaScript's Date API. For date references, see TimeAndDate.com.
Frequently Asked Questions
How do I add days to a date?
Enter your starting date and the number of days to add. The calculator accounts for variable month lengths and leap years. For example, adding 90 days to January 15, 2026 gives April 15, 2026.
What date is 30 days from today?
The answer changes daily. Enter today's date and add 30 to get the result. Note: 30 days is not the same as 'one month' — months range from 28 to 31 days.
Can I subtract days from a date?
Yes — enter a negative number or use the subtract mode. This is useful for finding past dates, like 'what date was 90 days ago' for warranty or return policy calculations.
How do I calculate a date weeks or months from now?
For weeks, multiply by 7 and add that many days. For months, select the 'months' option — the calculator handles the variable month length correctly, including February in leap years.
Results are calculated in your browser using standard formulas and are provided for reference only. For critical or high-stakes decisions, verify results with an authoritative source.
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