1. What is the 90 Days Back Calculation?

The 90 days back calculation is a simple date arithmetic that subtracts 90 days from a given date. This is commonly used in various fields like finance, law, and medicine to determine deadlines, eligibility periods, or follow-up dates.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( Today \) — Current date or any specified date
• \( 90\ days \) — Fixed period to subtract

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

3. Importance of Date Calculation

Details: Accurate date calculations are crucial for compliance with regulations, tracking important deadlines, and planning future events based on past dates.

4. Using the Calculator

Tips: Enter today's date or any reference date in YYYY-MM-DD format. The calculator will automatically compute the date 90 days prior.

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 if I need a different time period?
A: This calculator is specifically for 90 days. For other periods, you would need a different calculator.

Q3: Is the calculation timezone-sensitive?
A: No, the calculation is based on calendar dates only, without considering time zones.

Q4: Can I use this for business days?
A: No, this calculates calendar days. For business days (excluding weekends/holidays), a different calculation is needed.

Q5: What's the maximum/minimum date range?
A: The calculator works with any valid date in the Gregorian calendar system.