1. What is the 90 Day Calculator?

The 90 Day Calculator calculates the date that is exactly 90 days after a given start date. This is useful for various planning purposes, deadlines, or tracking periods.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• Start Date — The initial date from which to calculate
• 90 days — The fixed period to add

Explanation: The calculation accounts for varying month lengths and leap years to ensure accurate date calculation.

3. Importance of Date Calculation

Details: Accurate date calculation is crucial for project planning, legal deadlines, medication schedules, and various time-sensitive activities.

4. Using the Calculator

Tips: Simply enter the start date in the format YYYY-MM-DD and click calculate. The calculator will show the date exactly 90 days later.

5. Frequently Asked Questions (FAQ)

Q1: Does this include the start date in the count?
A: No, the calculation starts counting from the day after the start date.

Q2: How are leap years handled?
A: The calculator automatically accounts for leap years in the calculation.

Q3: Can I calculate business days only?
A: This calculator counts calendar days (including weekends). For business days, a different calculator would be needed.

Q4: What's the maximum date range?
A: The calculator can handle dates within the range supported by PHP's DateTime class (typically years 1901-2038 on 32-bit systems).

Q5: Can I calculate dates before the start date?
A: This calculator only calculates forward in time. For date subtraction, a different calculator would be needed.