1712, Erra Pater, A Prognostication for Ever, Made by Erra Pater, page 7:
Observe when the Moon is new in February, the next Tuesday after is Shrove-tuesday: but if it change on Tuesday, then the next Tuesday following is Shrove-tuesday
1779, David Dalyrymple, Annals of Scotland From the Accenssion of Robert I, page 283:
The day appointed for this extraordinary hunting-party was Shrove Tuesday. The Protestants of Paisley, in whose neighbourhood this story may be said to have originated, cannot discern the difference betwixt Shrove Tuesday and any other Tuesday; but if a Roman Catholic Princess, even in our free times, should be invited to a hunting-match on Shrove Tuesday, she would be shocked at the profane invitation.