Star Wars day is every year on the 4th of May. It is derived from a pun on the Jedi phrase "May the force be with you", namely "May the Fourth be with you".
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You don't understand the startdates?
Take, for example, 20150503.1518
Let me stick some spaces in some helpful places:
2015 05 03 . 15 18
That better?
20150503 means 3rd May 2015, and 1518 is in 24-hour clock format, IE 3:18PM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.
Star Wars day is every year on the 4th of May. It is derived from a pun on the Jedi phrase "May the force be with you", namely "May the Fourth be with you".
[More...]