1. What is Duration Between Dates?

The duration between dates calculator measures the exact time period between two dates in years and months. This is useful for calculating ages, project durations, or any time-sensitive measurements.

2. How Does the Calculator Work?

The calculator uses PHP's DateTime functions to compute the difference:

Where:

• Start Date — The beginning date of the period
• End Date — The ending date of the period

Explanation: The calculation accounts for varying month lengths and leap years to provide an accurate duration.

3. Importance of Date Duration Calculation

Details: Accurate duration calculation is crucial for age verification, financial calculations, project planning, and legal documentation.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Does this account for leap years?
A: Yes, the calculation automatically accounts for leap years and varying month lengths.

Q2: What's the maximum date range?
A: The calculator can handle any valid date range supported by PHP (roughly years 100-9999).

Q3: Can I calculate future durations?
A: Yes, as long as the end date is after the start date, future durations can be calculated.

Q4: Why doesn't it show days?
A: This calculator focuses on years and months only. For day-level precision, a different calculator would be needed.

Q5: How precise is this calculation?
A: It's precise to the month level, calculating complete months between dates.