This could be a silly question but did they screw up due to timezone differences if any ? I deal with clients all over the world and I always specify what timezone I am talking about. I never say "how is 11 AM". Instead, I ask "How is 11 AM Eastern?". I also add if possible "I know you are 4 hours ahead of me...." to ensure that they pay attention to the timezone.
If not the timezone issue, then it could just be a mistake/sloppiness on the recruiter's part.
Should you correct him ? Yes, definitely. Say that their scheduled time is not on the suggestion you sent earlier. But if it is ok with you, accommodate anyway. Either way, don't read too much into recruiters. They are just a way to get into the company. If you like the company/team, don't worry about the recruiter.