1. What is Days Calculation?

Days calculation determines the number of days between two dates. This is useful for various purposes including project planning, interest calculations, age determination, and more.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

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

Explanation: The calculator computes the exact number of days between two calendar dates, including all days in between.

3. Importance of Days Calculation

Details: Accurate day counting is essential for financial calculations (interest, penalties), project management (timelines), legal matters (contract durations), and personal planning (vacations, events).

4. Using the Calculator

Tips: Simply enter two valid dates in the format YYYY-MM-DD. The calculator will automatically compute the number of days between them.

5. Frequently Asked Questions (FAQ)

Q1: Does this include both start and end dates?
A: The calculation includes all days between the two dates, but whether to count the start/end dates depends on your specific requirements.

Q2: How are leap years handled?
A: The calculation automatically accounts for leap years and varying month lengths.

Q3: What's the maximum date range?
A: The calculator can handle any valid date range supported by PHP's DateTime class (roughly years 0-9999).

Q4: Can I calculate days excluding weekends?
A: This basic calculator counts all days. For business day calculations, a more specialized tool would be needed.

Q5: What if I enter dates in the wrong order?
A: The calculator will still give you the correct positive number of days between the dates, regardless of their order.