1. What is the 90 Days Prior Calculator?

The 90 Days Prior Calculator calculates the date that is exactly 90 days before a given date. This is useful for various planning, legal, and medical purposes where a 90-day period needs to be referenced.

2. How Does the Calculator Work?

The calculator uses simple date arithmetic:

Where:

• \( Date \) — The input date in YYYY-MM-DD format
• \( New\ Date \) — The calculated date 90 days prior

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

3. Importance of Date Calculation

Details: Calculating exact date periods is crucial for legal deadlines, medical treatment plans, financial planning, and various compliance requirements.

4. Using the Calculator

Tips: Enter any valid date in YYYY-MM-DD format. The calculator will return the date exactly 90 days prior to your input date.

5. Frequently Asked Questions (FAQ)

Q1: Does this account for leap years?
A: Yes, the calculation automatically adjusts for leap years and varying month lengths.

Q2: What date format should I use?
A: Use the standard YYYY-MM-DD format (e.g., 2023-12-31).

Q3: Can I calculate dates more than 90 days prior?
A: This calculator specifically calculates 90 days prior. For other periods, use a different calculator.

Q4: What if my date is invalid?
A: The calculator will only accept valid dates in the correct format.

Q5: Can I use this for business days only?
A: No, this calculates calendar days (including weekends and holidays).