Forsure man there is no problem with that it wont do them any harm at all, in fact every spring about 10-11 days before i plant my clones and seedlings i hardin them off, meaning i put them outside during the day for most of the day in order to get them aclamated to the outside conditions basiclly to make them stronger.
That has never did me wrong or mess me up, it seems like it has done me good lol but im not sure its an actuall proven method but i likke too do it, it makes me feel better. Its routine more or less, haha. But good luck buddy hope things go well 4 you.