I appreciate the responses that I have received regarding this problem.  After more observation, I would like to clarify the problem since others may also have noticed this or be affected by it in the future.  

All reports that are displayed on my computer screen, and all reports that are downloaded to a PDF, are correctly time-tagged with my local Time Zone.  Only reports that are downloaded to EXCEL are time-tagged in the Pacific Time Zone (GMT-7).  While the time-tag shown in Excel is technically correct, it can be confusing at first glance for us Easterners who don't typical do bookkeeping in the wee hours of the morning!