What happened on your birthday? What happened on this day in history? CDAY reports events and birthdays and displays the date in different calendar systems.
CDAY WX is a graphical application for Windows and Linux suitable for most end-users. It includes the calendars and the almanac.
CDAY was inspired by Chesiresoft Calendar-Almanac, which was inspired by Patrick Kincaid's famous TODAY/PC (1986-1993). Earlier still, Mike Butler wrote TODAY for IBM VM/CMS in PL/1 (whatever that is).