THEN

I think I've worked out why I gained (or lost, bear with me, my memory is rubbish, remember?) a day a while back. 

I've clearly forgotten one reading, maybe two. It has happened more than once - but when I get around to filling it in it goes where there's a space, rather than where it should be - this is only if I'm doing twenty seven billion things at once. Actually, it probably takes me doing just two things to forget. 

But that seems the best explanation why a day disappeared or was gained.