1. What is Date Difference Calculation?

The date difference calculation determines the exact number of days between two calendar dates. This is useful for various applications including project planning, age calculation, and duration measurement.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( Date1 \) — The earlier start date
• \( Date2 \) — The later end date

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 crucial for project management, financial calculations, legal agreements, and personal planning.

4. Using the Calculator

Tips: Enter both dates in YYYY-MM-DD format. The calculator will automatically validate the dates and ensure Date2 is after Date1.

5. Frequently Asked Questions (FAQ)

Q1: Does this 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 in the period between the two dates.

Q3: What's the maximum date range?
A: The calculator can handle any valid date range within the limits of PHP's DateTime implementation.

Q4: Can I calculate time differences too?
A: This calculator focuses on full day differences. For time calculations, a more advanced calculator would be needed.

Q5: What date formats are supported?
A: The input uses HTML5 date picker which follows YYYY-MM-DD format, but displays according to your browser's locale settings.