To determine how many days ago September 28th, 2019 was, we need to calculate the difference between that date and today's date. Since the exact number of days changes constantly, I cannot provide a precise answer without knowing the current date.
However, you can easily calculate this yourself using an online date calculator or by using the date functions within a spreadsheet program like Microsoft Excel or Google Sheets. Simply input September 28th, 2019, as the starting date and today's date as the ending date. The calculator or spreadsheet will then give you the exact number of days between those two dates.