To determine how many days ago September 15th, 2021, was, we need to know the current date. Since I don't have access to real-time information, including the current date, I can't provide a precise answer.
However, you can easily calculate this yourself using an online date calculator or by using the date functionality built into your computer or smartphone's calendar. Simply input September 15th, 2021, as the starting date and today's date as the ending date. The calculator will then show you the difference in days.
