Hi Magnus,
Sorry for any confusion on my part or that I may have caused. I don't know the first thing about MIH calendar mechanism or how it mates with the 7750 base. I took Marc's question to be a generic one about the 7750, and in the instances where that caliber has merely a date or day and date, noon is a safe bet. In light of Marc's follow up, it's clear he is interested in the MIH specifically, and I'd have to revert to the meat of my previous recommendation which is to follow the manufacturer's instructions.
_john