Dear Ola,
DAY ONE of Obama's 42 Month reign must begin, not on April 8 (as you state), but rather, on April 11. Reason being: April 11, 2012 + 1260 days = September 23, 2015 (Feast of Trumpets). If his reign were to begin on April 8, the day count would be 1263 days (3 days too many).
Richard