Donald Trump said yesterday, "I was a Democrat years and years ago.."
Donald Trump - Democratic Party member 2001 - 2009
Ronald Reagan left the Democratic Party almost 20 years before he became president.
Reagan registered as a Republican for the first time in 1962 and was nominated as the Republican candidate for Governor in 1966. So according to your internal timetable you would not have voted for him because he wasn’t really a Republican.