January 7, 1978 was a Saturday.
This happens in any year with dominical letter A or AG.
Such years are all years beginning on Sunday (disregarding the effect of leap day).
January 23 1978 was a Monday.
January 29 1978 was a Sunday.
January 4th 1978 was a Wednesday.
January 20, 1978 was a Friday.
January 27, 1978 was a Friday.
January 20 1978 was a Friday.
January 1st, 1978 fell on a Sunday.
January 5, 1978 fell on a Thursday.
January 10, 1978 fell on a Tuesday.
January 25, 1978 fell on a Wednesday.
31st of January 1978 fell on a Tuesday.
January 7th, 1900 was a Sunday.