Jam every other day
"'It's very good jam,' said the Queen.
'Well, I don't want any TODAY, at any rate.'
'You couldn't have it if you DID want it,' the Queen said.
'The rule is, jam tomorrow and jam yesterday - but never jam today.'
'It MUST come sometimes to "jam today",' Alice objected.
'No, it can't,' said the Queen, -
'It's jam every OTHER day:
today isn't any OTHER day, you know.'
Through The Looking Glass - Carroll