Spock turns to asses the man and his question. It stands to reason that he doesn't know where he is. Spock, himself, only has the vaguest of ideas, as space is vast and he currently has no coordinates, but Spock can work with that until he can get more pertinent information.

"As we are in space, it is highly unlikely that there is no light reaching us from a sun, however calling it daylight would imply that it has a bearing on the station's current time of day."