1. What is Date Difference Calculation?

The date difference calculation determines the exact number of days between two calendar dates. This is useful for project planning, age calculation, billing cycles, and many other applications.

2. How Does the Calculator Work?

The calculator uses the following simple formula:

Where:

• \( date1 \) — The earlier date (start date)
• \( date2 \) — The later date (end date)
• \( Days \) — The number of days between the two dates

Explanation: The calculation counts all calendar days between the two dates, including the start date but excluding the end date.

3. Importance of Date Calculation

Details: Accurate date difference calculation is essential for financial calculations, legal contracts, project management, and personal planning.

4. Using the Calculator

Tips: Enter both dates in YYYY-MM-DD format. The calculator will automatically compute the number of days between them.

5. Frequently Asked Questions (FAQ)

Q1: Does the calculation include both start and end dates?
A: By default, it includes the start date but excludes the end date in the count.

Q2: How are leap years handled?
A: The calculation automatically accounts for leap years and varying month lengths.

Q3: What if date1 is after date2?
A: The calculator will return a negative number indicating how many days date1 is after date2.

Q4: Can I calculate time differences as well?
A: This calculator focuses on full day differences. For time calculations, more advanced tools are needed.

Q5: What's the maximum date range supported?
A: The calculator can handle any valid dates within the range supported by PHP (typically 1970-2038).