1. What Is A 90 Day Date Calculator Duration?

The 90 Day Date Calculator calculates the duration between two dates in days and checks if the duration equals exactly 90 days. This is useful for various legal, financial, and planning purposes where 90-day periods are significant.

2. How Does The Calculator Work?

The calculator uses simple date arithmetic:

Where:

• \( Start Date \) — The beginning date of the period
• \( End Date \) — The ending date of the period
• \( Duration \) — Difference in calendar days

Explanation: The calculation counts all calendar days between the two dates, including the start date but excluding the end date.

3. Importance Of Date Duration Calculation

Details: Accurate date duration calculation is crucial for compliance with 90-day rules in visas, financial transactions, legal contracts, and various regulatory requirements.

4. Using The Calculator

Tips: Enter both dates in YYYY-MM-DD format. The calculator will show the exact number of days between them and indicate whether it equals exactly 90 days.

5. Frequently Asked Questions (FAQ)

Q1: Does this count business days or calendar days?
A: This counts all calendar days (including weekends and holidays).

Q2: Is the end date included in the count?
A: No, the calculation includes the start date but excludes the end date.

Q3: What's the maximum date range this can handle?
A: The calculator can handle any valid date range supported by PHP's DateTime class.

Q4: How accurate is this for leap years?
A: The calculation automatically accounts for leap years and varying month lengths.

Q5: Can I use this for date ranges spanning multiple years?
A: Yes, the calculator works for any date range regardless of year boundaries.