Simple. Elementary, and not involved or complicated windows calendar application.
You just want to see a calendar, and clicking on the time in the tray is cumbersome, and there is the possibility you may accidentally change your system date and time. So here is a free windows calendar app that could not be more simple and easy. A 16k file, that just opens up a calendar.

Great Simple non-intrusive calendar that does the job with a minimum of memory useage. Thanks ALLSCOOP!!!!
Hmm doesn’t seem to work (XP home sp2, non-admin)