While Wonder Woman may have made her first appearance in the pages of All Star Comics #8, back in 1941, somebody at DC in the 70′s decided her birth on Paradise Island occurred on March 22.
Above: a shot of the previously mentioned calendar, via http://dcwomenkickingass.tumblr.com
Below: Here’s a whopping three panels to explain her origin.
And her origins as told on The Super Friends:
The first glimpse of Diana from All Star Comics #8 as drawn by HG Peter.
What post on Wonder Woman would be complete without a shot of Lynda Carter?