What day of the week was August 12, 1953?

The day of the week August 12th, 1953 fell on was a Wednesday.

Nuclear weapons testing: the Soviet atomic bomb project continues with the detonation of Joe 4 the the first Soviet thermonuclear weapon. The islands of Zakynthos and Kefalonia in Greece are severely damaged by an earthquake measuring 7.3 on the Richter scale.