'May the 4th be with you': Former British PM Margaret Thatcher's unique connection with Star Wars day

"May the fourth be with you!" - a phrase that has been used innumerable times by fans, leaders, and pop icons. But how many of us know the origin of the phase? Of course, it is merely a wordplay of the famous dialogue 'May the force be with you' from 'Star Wars', but who used it first and how did May 4 become Star Wars day?

May the force be with you in such an unprecedented time.