Thank you   GUEST,Karen Impola - Singers of 'The Greenland Whale Fisheries'seem to choose a variety of calendar dates (and years ) . Most sing “the 18th day of June” as I discovered in the JUDY COLLINS & THEODORE BIKEL recording that you mention.
JUDY COLLINS & THEODORE BIKEL ~ The Greenland Whale Fisheries     https://www.youtube.com/watch?v=A79-0mYkbJA       Thanks for finding a version to add to the March tally of songs.

I shall put this tip 'behind my ear' and perhaps roll it out for the June version of this thread.