Date Calculator
Calculate the duration between two dates or add and subtract time from any date. Results shown in days, weeks, months, and years.
Whether you need to count the days until a deadline, figure out how many weeks remain in a project, or determine a future date by adding months to today, this calculator handles it all. It supports two modes: duration calculation between any two dates, and date arithmetic where you add or subtract a specific amount of time from a starting date.
Results are broken down into multiple units simultaneously — you'll see the answer in days, weeks, months, and years so you can use whichever unit fits your needs. The business days option excludes weekends from the count, which is useful for project planning, contract timelines, and shipping estimates. All calculations account for leap years and varying month lengths automatically.
Every calculation generates a shareable URL, so you can bookmark results or send them to colleagues. Common use cases include tracking age in exact days, planning travel itineraries, calculating loan or lease durations, and determining school or work schedules.
How to Use the Date Calculator
- Duration Between Dates: Select a start and end date to see the difference in days, weeks, months, and years. Toggle "Include end date" to count the end date itself.
- Add / Subtract: Pick a start date, choose to add or subtract, enter an amount, and select the unit (days, weeks, months, or years) to see the resulting date.
- Business Days: In the duration mode, check "Show business days" to see the count excluding weekends.
- Share Results: Use the "Copy link" button to share a URL that preserves your calculation for others to view.