I have a big guess that if the ICO starts at 12:00 and you send your deposit in 11:55. I bet your deposit will be successful but will be rejected by the project and you will not get any token from them since there's a contract that operates for the time which is the accepted deposits only are the transaction/s made from start time to end time of the ICO. But you should contact the team first before doing anything. Or someone correct me of I'm wrong here