1. What is the 90 Days Back Calculator?

This calculator determines the date that is exactly 90 days prior to a given date. This is particularly useful for percentage calculations and time-based analyses in various contexts.

2. How Does the Calculator Work?

The calculator uses simple date arithmetic:

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 when determining the date 90 days prior.

3. Importance of Date Calculation

Details: Calculating dates 90 days back is important for financial calculations, project timelines, legal deadlines, and percentage change measurements over specific periods.

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: Why calculate 90 days specifically?
A: 90 days is a common quarter-year period used in financial reporting, legal deadlines, and various business calculations.

Q2: Does this account for leap years?
A: Yes, the calculation automatically adjusts for leap years and varying month lengths.

Q3: Can I use this for business days only?
A: This calculator counts calendar days. For business days (excluding weekends/holidays), a different calculation would be needed.

Q4: How precise is this calculation?
A: The calculation is precise down to the day, accounting for all calendar variations.

Q5: Can I calculate other time periods with this?
A: This specific calculator is designed for 90-day calculations, but could be modified for other periods.