EASTER is the first Sunday after the first full moon AFTER the Vernal equinox. Hence, Easter can never be earlier than March 21st or thereabouts. Just find out when the full moon is after the Vernal (Spring) equinox, and count back 3 days---Sunday, Saturday, FRIDAY! It is therefore impossible for Good Friday to be March 1st. Trust me. I'm correct on this.

As for Roddy McCorley, the Kingston Trio did a quintessential version of this tune on their "College Concert" album with John Stewart, who had replaced Guard one album before. So there!