1. What is a Day-to-Day Calculator?

Definition: This calculator computes the number of days between two dates.

Purpose: It helps determine the exact duration in days between any two calendar dates.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Days \) — Number of days between dates
• \( Date2 \) — End date (later date)
• \( Date1 \) — Start date (earlier date)

Explanation: The calculator counts each calendar day between the two dates, including the start date but excluding the end date.

3. Importance of Day Counting

Details: Accurate day counting is essential for project planning, contract terms, interest calculations, and various legal and financial applications.

4. Using the Calculator

Tips: Simply enter the start date and end date in the format YYYY-MM-DD. The calculator will automatically compute the days between them.

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 and varying month lengths.

Q3: Can I calculate days between BC and AD dates?
A: This calculator is designed for dates within the standard Gregorian calendar range.

Q4: What's the maximum date range?
A: The calculator can handle any reasonable date range within the limitations of PHP's DateTime class.

Q5: Does time of day affect the calculation?
A: No, the calculation is based on calendar dates only, not times.