January 19 - the Unix epoch completes itself as the number of seconds since January 1, 1970 overflows the maximal value that can be stored in 32 bits as a signed integer. Unless reprogrammed, 32 bit computers will malfunction and many Java and JavaScript programs will stop working.
April 25 - Easter occurs on its latest possible date. The previous time this occurred was in 1943
... in the male, where the opening is not quite where it should be (it occurs lower than normal in hypospadias). A chordee[?] is when the urethra develops between the penis ...