Crossword clues for the word: CALENDARREFORM The word CALENDARREFORM has appeared as an answer to at least 1 crossword clue on different crossword puzzles. Crossword clues for CALENDARREFORM Showing 1 to 1 of 1 results Clue(s) The change from Julian to Gregorian ... or what would be needed to make 20-, 31- and 40-Across possible?