Date Calculator
Calculate dates and duration. Add or subtract time from a date, or find the number of days between two dates.
How to Use the Date Calculator
This versatile tool offers two modes:
- Add/Subtract Mode: Enter a start date and add or subtract years, months, weeks, and days to find a future or past date.
- Date Difference Mode: Select two dates to calculate the exact number of days, weeks, and months between them.
Common Uses
- Event Planning: Calculate 90 days from today for wedding preparations.
- Age Calculation: Find the exact number of days you've been alive.
- Contract Deadlines: Determine the end date of a 30-day lease or subscription.
- Project Management: Calculate duration between project start and end dates.
Frequently Asked Questions
Does it count leap years?
Yes, our calculator accurately accounts for leap years (29 days in February) when calculating valid dates and durations.
What is "Include end date"?
By default, the difference is calculated as (End Date - Start Date). Checking this box adds 1 day to include both the start and end days in the count, often used for daily billing.