What is the date 90 days from January 15?

Calculating 90 days before Wednesday January 15, 2025 by hand

This page helps you figure out the date that is 90 days before Wednesday January 15, 2025. We've made a calculator to find the date before a certain number of days before a specific date. If you want to change the question on this page, you have two choices: you can change the URL in your browser's address bar, or go to our days before specific date calculatorto type in a new question or days from a specific date if you want to add 90 days.

But for all you time sickos out there who want to calculate 90 days before Wednesday January 15, 2025 - here's how you do it:

1. Start with the Input Date (Wednesday January 15, 2025): Write it down! I can't stress this enough
2. Count in Weeks: Recognize that 90 days is approximately 12.857142857142858 weeks. Count forward 12.857142857142858 weeks (18.0 work weeks) from the input date. This takes you to .
3. Add Remaining Days: Since you've counted 12.857142857142858 weeks, you only need to add the remaining days to reach Thursday October 17, 2024
4. Use Mental Math: If Wednesday January 15, 2025 is a Thursday, then compare that to if 90 is divisible by 7. That way, you can double-check if October 17 matches that Thursday.