🙄 Doug Belshaw Happy New Year! Ah, if only the French Revolutionary calendar had caught on, eh? en.m.wikipedia.org...

Neil Ford I'm just going to assume that reading that is going to make my head hurt and accept that your are twisted and evil. Best all round.

Eric This could really do with a visual graph explaining it, otherwise it's a bit of a mind-bender. Btw, I had to change to https to http to work your link.