An add days to date calculator answers questions like "What date is 90 days from today?" — essential for contract deadlines, legal notice periods, warranty expiry dates, and project planning. Enter any start date, choose how many days to add or subtract, and get the exact result instantly.
Date Calculator
Result Date
How to Use the Add Days to Date Calculator
This free add days to date calculator helps you find the exact date a certain number of days in the future or past. Whether you need to know when a 90-day contract expires, when a 30-day return window closes, or what date falls 180 days from now, this tool gives you the answer instantly.
Step 1: Enter a Start Date
Click the date picker and choose your starting date, or click the Today button to automatically fill in the current date. The start date is the reference point from which days will be added or subtracted.
Step 2: Choose Add or Subtract
Use the direction toggle to choose whether you want to count forward (Add) or backward (Subtract) from your start date. Adding days moves into the future; subtracting days moves into the past.
Step 3: Enter the Number of Days
Type the number of days in the input field, or use one of the quick preset buttons (7, 14, 30, 45, 60, 90, 120, 180, or 365 days) for common time periods. Presets are especially useful for standard contract terms and legal notice periods.
Step 4: View the Results
Click Calculate to see the result date displayed prominently, along with the day of the week. The stats panel breaks down the time span into weeks and remaining days, and shows the approximate number of calendar months between the two dates.
Common Use Cases
People commonly use a date plus days calculator for contract deadlines (30, 60, or 90-day terms), legal notice periods, warranty expiry dates, subscription renewals, probation period end dates, loan maturity dates, and planning events a set number of days in the future. The subtract mode is equally useful for working backwards from a deadline to determine when a process should have started.
FAQ
Is this add days to date calculator free?
Yes, completely free with no signup or account required. You can run as many calculations as you like. Everything runs locally in your browser — no data is sent to any server.
Is my data private?
Yes. All calculations happen entirely in your browser using JavaScript. No dates or personal information are transmitted to any server. The tool works offline once the page has loaded.
What date is 90 days from today?
Enter today's date (or click the Today button) and type 90 in the days field with Add selected. The calculator instantly shows the exact date that falls 90 days in the future, including the day of the week.
Can I subtract days from a date?
Yes. Toggle the direction to Subtract, enter your reference date and the number of days, and the calculator counts backwards. This is useful for finding when a return window or notice period started.
Does this calculator account for leap years?
Yes. The tool uses standard JavaScript date arithmetic which correctly handles leap years, varying month lengths, and all calendar edge cases. February 29 is included when it applies.
How do I calculate a contract deadline from a signing date?
Enter the contract signing date as the start date, type the number of days in the contract term (e.g., 180 for a 6-month term), and click Calculate. The result shows the exact deadline date and the day of the week it falls on.
What is the difference between calendar days and business days?
Calendar days count every day including weekends and holidays. Business days typically count only Monday through Friday. This calculator uses calendar days, which is the standard for most contracts, legal deadlines, and notice periods.