Math
Date Calculator
Calculates the exact difference in days, weeks, months and years.
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(before)
Days
Weeks
Months (approx.)
Years (approx.)
Select two dates to calculate
Enter a date and number of days
What does Date Calculator?
A date calculator that finds the number of days between two dates, or adds and subtracts days from a starting date.
How to use Date Calculator?
- Choose a tab: "Days between dates" or "Add/subtract days".
- Enter the dates and click "Today" to auto-fill any field.
- The time difference is shown in days, weeks, months and years.
Key features
- Two modes: difference between dates and adding days to a date
- "Today" button for every field for quick entry
- Result shown in four formats: days, weeks, months and years
Frequently asked questions
Does the tool count business days only?
No. The tool counts calendar days. To get business days, subtract weekends and holidays manually.
What happens if the end date is before the start date?
The tool shows the absolute difference and flags that the end is before the start.
Is this tool free?
Yes, this tool is completely free and requires no registration.
Is my data saved?
No. All calculations happen in your browser only — no data is sent to any server.