1. What is the Birthday Calculator?

The Birthday Calculator calculates age from birth date or formats dates in different styles. It provides accurate age calculation including years, months and days, or converts dates to various formats.

2. How Does the Calculator Work?

The calculator uses PHP's DateTime functions to:

Explanation: The age calculation accounts for exact days in months and leap years to provide precise results.

3. Importance of Date Calculation

Details: Accurate age calculation is important for medical, legal, and personal purposes. Date formatting is crucial for international communication and documentation.

4. Using the Calculator

Tips: Enter a valid birth date and select whether you want to calculate age or format the date. The calculator will display the results immediately.

5. Frequently Asked Questions (FAQ)

Q1: How precise is the age calculation?
A: The calculation is precise down to the day, accounting for leap years and varying month lengths.

Q2: What date formats are available?
A: YYYY-MM-DD (international), MM/DD/YYYY (US), and DD.MM.YYYY (European) formats.

Q3: Does it work for future dates?
A: Age calculation will show negative values for future dates. Date formatting works for any valid date.

Q4: What's the earliest date I can enter?
A: The calculator works with any date supported by PHP's DateTime (typically 1901-2038 on 32-bit systems).

Q5: Can I calculate age at a specific date?
A: This version calculates age from birth date to current date only.