Date Difference

💡 About This Tool

This tool accurately calculates exactly "how many days" are between two dates. "How many days until the exam?", "How long has this project been running?", or "How many days have passed since that event?"—it handles calculations that are tedious to count on a calendar.

📘 Usage Tips

• Select Start and End Dates Just pick dates from the calendar, and the number of days will be calculated automatically.
• Check Weeks Too The result shows not only the total days but also the breakdown in weeks (e.g., "X weeks, Y days"), helping you grasp the duration better.
• Past Dates Supported You can calculate the difference from past dates as well, such as "how many days since I was born".

🧐 Frequently Asked Questions

Q. Is the first day included in the count?

A. This tool calculates the "difference", so it does not include the start date. It simply subtracts the start date from the end date (e.g., from today to tomorrow is 1 day).

Q. Can I calculate only business days?

A. In the current version, the tool calculates all calendar days, including weekends and holidays. We are considering adding a business day calculator in the future.

📚 Trivia

Do you know the rules for a Leap Year? Basically, it's every year divisible by 4. However, there is an exception: "years divisible by 100 are NOT leap years," unless "they are also divisible by 400." This tool, of course, takes these Gregorian calendar rules into account for accurate calculations.