1. What Is This Calculator For?

This calculator helps you determine the date that was exactly 90 days ago from a given date. This is particularly useful for financial, legal, or medical contexts where a 90-day period is relevant (e.g., payment terms, probation periods, or medical follow-ups).

2. How Does The Calculation Work?

The calculator uses simple date arithmetic:

The calculation accounts for varying month lengths and leap years automatically.

3. Common Use Cases

Details: This calculation is commonly used in:

• Financial reporting (90-day periods)
• Medical follow-up timelines
• Legal deadlines and probation periods
• Business payment terms
• Percentage change calculations over 90 days

4. Using The Calculator

Tips: Simply enter today's date (or any reference date) in YYYY-MM-DD format and click calculate. The default is set to the current 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: Can I use this for business days only?
A: No, this calculates calendar days. For business days, you would need a different calculator.

Q3: How precise is this calculation?
A: It's precise to the day, accounting for all calendar variations.

Q4: Can I calculate dates other than 90 days?
A: This specific calculator is designed for 90-day calculations only.

Q5: Why is this useful for percentage calculations?
A: Many financial and scientific analyses compare metrics over standard 90-day periods (quarter years).