au temps pour moi

Etymology
Whether the true orthography is autant pour moi or au temps pour moi is unknown. The two co-exist and have their proponents:

1) autant pour moi: an elliptic form of the expression « C'est autant pour moi », or « C'est autant d'erreur que l'on peut mettre à mon actif » (~ those are mistakes one can attribute to me). This version is defended by French writer and translator Claude Duneton.

2) au temps pour moi: according to the, au temps ! originally meant to start all over again in the military . Then more extensively, it began to be used to agree to a mistake, and to agree to "start all over again" so as not to do it again. But this explanation is criticised by some people considering that this form is a pedantic respelling of autant pour moi.

The only allows the second form of the expression, but the first is very common.

Interjection

 * 1) my bad, my mistake, silly me, I stand corrected