しとけ

[BetterSense]

This is from a manga. Character A wants to go give something to someone and character B seems to be saying 'it's late, why don't you do it in the morning?'

もう夜だ
明日にしとけ

What's troubleing me is the しとけ。

[hungryhotei]

It's from しておけ。 It's just an abbreviation in the same way ーてしまう becomes ーちゃう。
http://www.guidetojapanese.org/enduring.html#part5

[draglung]

Haha this one got me too in one of the other manga. By the way しておく　means either do in advance or an action causes a resultant state. So why is doing something tomorrow uses this form?

Or is it because you prepare to do it tomorow and hence it is kind of like doing in advace(intention or preparation in this case)?

[Sunken]

That's the way I think about it. Remember, 明日にして doesn't mean "do it tomorrow" here, it means "make it tomorrow" - as in "make that twenty minutes". So 明日にしておく means something like "better make it tomorrow so there's enough time" (or some other desireable condition)

[Yudan Taiteki]

I think 明日にしておけ might also mean "make it tomorrow" -- usually に is not used with relative time words to indicate the time of an action.

[AJBryant]

I think 明日にしておけ might also mean "make it tomorrow" -- usually に is not used with relative time words to indicate the time of an action.

True, but the key element here isn't 明日になになに it's なになににする, and you definitely need the に before the する.

Tony

[Yudan Taiteki]

Right, that's what I was trying to say. I think that also explains the おけ well.