Paleographic dating site
The papyri in question had been dated first palaeographically, and then very small snippets were submitted to three respected laboratories in the USA for independent dating by Carbon-14 processes.
Many major libraries (e.g., the British Library) have a policy that does not permit any destruction of an item in any measure.
So, since Carbon-dating requires that a tiny piece of an item be cut off and burned, hardly ever are we going to have Carbon-dating of items in these major collections.
This is what makes the Green Collection policy so useful, not only for their own items, but also for the fields of papyrology and palaeography more widely.
Until the Calendar Act of 1752, the year in England began officially on 25 March (Lady Day), and not 1 January (even though this was when New Year’s Day was celebrated).