1. What is the Year And Month Counter?

The Year And Month Counter calculates the precise duration between two dates in years and months, using an average month length of 30.4375 days for accurate conversion.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( \text{Date1} \) — Start date
• \( \text{Date2} \) — End date
• \( 30.4375 \) — Average days per month (365.25/12)

Explanation: The calculator first computes total days between dates, then converts to months using the average month length, and finally converts to years and months.

3. Importance of Date Difference Calculation

Details: Calculating precise time intervals is essential for financial calculations, project planning, age determination, legal documents, and medical applications.

4. Using the Calculator

Tips: Enter valid start and end dates in YYYY-MM-DD format. The end date must be after the start date for meaningful results.

5. Frequently Asked Questions (FAQ)

Q1: Why use 30.4375 days per month?
A: This accounts for the average month length over a 4-year cycle including leap years (365.25 days/year ÷ 12 months).

Q2: How accurate is this calculation?
A: It provides a good approximation. For exact calendar months, use month/day counts instead.

Q3: Can I calculate age with this?
A: Yes, by using birth date as Date1 and current date as Date2.

Q4: What's the maximum date range?
A: The calculator can handle any valid date range supported by PHP (typically 1970-2038 on 32-bit systems).

Q5: How are leap years handled?
A: The average month length automatically accounts for leap years in the calculation.