When I try to open a file in the recent files list in Excel I'll often find that a workbook I worked on yesterday or the day before is not in the list. When I expand the list to include older workbooks I'll find the workbook I was looking for, but the Date modified will show as several days prior to when I last worked on it.
Why does Excel seem to get the Date modified wrong for recent workbooks?
Here's an example, highlighting the Date modified as seen by Excel and the Date modified as seen by File Explorer. The File Explorer Date modified is correct: