Date calculator
Calculate the time between dates or add time to a date.
Date Calculator
Calculate days between dates or add/subtract days.
Date Calculator Online, The Complete Guide
Use our free date calculator online to find days between dates, add or subtract days from any date, and answer questions like how many days until a specific event. Essential for project planning and countdowns.
Days Between Dates Calculator
Our date difference calculator computes the exact number of days between any two dates. Perfect for calculating project durations, time until deadlines, or days since a past event. Results include total days, weeks, months, and years.
Add Days to Date
Need to add days to date? Enter a start date and number of days to find the resulting date. This is invaluable for calculating due dates, delivery windows, warranty expirations, or any deadline counting from a specific start date.
Subtract Days from Date
Going backwards? Subtract days from date to find past dates. Enter today and subtract 90 days to find when a quarterly period started, or calculate when an event occurred based on days ago information.
Tips for Date Calculations
- The calculator automatically accounts for leap years
- Use the date picker for easier date selection
- Results show both calendar days and business days when relevant
- Handles varying month lengths automatically for accurate results
Related Tools
More than a quick date calculator.
A date calculator helps answer everyday scheduling questions: how many days are between two dates, what date falls after a period of time, or how long a project has been running. It is a fast way to take the arithmetic out of planning.
For contracts, legal deadlines, payroll, or regulated processes, verify whether weekends, holidays, time zones, and local rules change how a deadline is calculated. This tool gives a calendar calculation, not legal advice.
How to use the date calculator.
Start with the tool above. There is no account step between you and the result.
- 01
Choose the calculation you need.
- 02
Enter the relevant date or dates.
- 03
Review the result and adjust the inputs for another scenario.
Date calculator answers.
Useful context before you use the result somewhere important.
Does this account for business days?
Use the option provided by the tool when available; otherwise the result is a calendar-day calculation.
Can I calculate a past date?
Yes. Use a negative interval or an earlier comparison date where the tool supports it.
Is this suitable for a legal deadline?
Use it as a reference only and confirm the applicable rule, holiday calendar, and jurisdiction.
Give the document a place to go.
Keep PDFs, templates, feedback, approvals and signatures together in one workspace.