1. What is the Weeks Between Dates Calculator?

The Weeks Between Dates Calculator calculates the number of full weeks between two dates. This is useful for project planning, pregnancy tracking, academic scheduling, and other time-sensitive activities.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( \text{Date1} \) — The start date
• \( \text{Date2} \) — The end date
• \( \left\lfloor x \right\rfloor \) — Floor function (rounds down to nearest integer)

Explanation: The calculator first calculates the total number of days between the two dates, then divides by 7 (days in a week) and rounds down to get whole weeks.

3. Importance of Weeks Calculation

Details: Calculating weeks between dates is important for project management, medical applications (like pregnancy tracking), academic planning, and financial calculations like interest accrual.

4. Using the Calculator

Tips: Enter both dates in the format YYYY-MM-DD. The calculator will return the number of complete weeks between them. The end date should be after the start date for meaningful results.

5. Frequently Asked Questions (FAQ)

Q1: Does this count partial weeks?
A: No, this calculator only counts complete weeks. Any remaining days after full weeks are not counted.

Q2: How is this different from calendar weeks?
A: This counts 7-day periods, not calendar weeks (Sunday-Saturday or Monday-Sunday). For calendar weeks, you'd need a different approach.

Q3: What if my dates span a leap year?
A: The calculation automatically accounts for leap years in the day count.

Q4: Can I calculate weeks into the future?
A: Yes, just enter a future date as Date2 and today (or another date) as Date1.

Q5: What's the maximum date range this can handle?
A: The calculator can handle any valid date range that PHP's DateTime can process (roughly years 0-9999).