Date Calculator
Please enter valid dates and values.
What Is a Date Calculator?
A date calculator finds the number of days between two dates, or adds/subtracts a specific number of days, weeks, months, or years from a given date. It's useful for deadlines, project planning, contract terms, and event countdowns.
How to Use This Calculator
Choose "Days Between Dates" to find the duration between two dates, or "Add/Subtract from Date" to calculate a new date by adding or subtracting time from a starting date. Enter your values and click "Calculate" for an instant result.
Frequently Asked Questions
Does "days between dates" count both the start and end day?
This calculator counts the number of full days elapsed between the two dates, not including the start date itself.
Can I calculate dates far in the past or future?
Yes, this calculator works for any valid calendar date, past or future.
How are months handled when adding time?
Adding months adjusts the calendar month while keeping the day the same where possible — if the resulting month has fewer days, the date rolls to the last valid day of that month.
Does this account for leap years?
Yes, all calculations correctly account for leap years automatically.