She keeps these sheets in boxes by decade: one is labeled "the fifties"; another, "the sixties"; and so forth, through one she has labeled "the noughties".
She recently opened one of the earlier boxes and discovered the sheets were in tatters. Not only that, but the digits have all faded away. On one scrap, she found "rd nd" as consecutive entries. (The ordinal suffixes were presumably written in a hardier ink.) This did not enable her to work out precisely which dates these represented. But she did find within the same box, another, similar scrap showing two consecutive entries and was able to work out the precise dates to which they referred. What were those dates (including the year)?