Since the advent of the Bowl game, 1/1 has fallen on a Sunday only 15 times before this year:
2017, 2012, 2006, 1995, 1989, 1984, 1978, 1967, 1961, 1956, 1950, 1939, 1933, 1928, 1922.
There have been no 1/1 Sunday games in the ~"BCS era" (1999-)
prior to that, even the Rose Bowl always played on 1/2 in those years.
There are only 3 Exceptions:
'95: Peach Bowl
'89: Gator Bowl
'50: Salad Bowl