It was a Tuesday.
Thursday
The Sabbath occurs every week.
Yes they do.
According to the Gregorian calendar, the first day of the week of the year 480 "anno domini nostri iesu christi ", which has been a leap year, was a Monday.
January 1, 2009 fell on a Thursday.
It may begin on any day
That day was a Tuesday.
Holy Week begins on the same day throughout the world. This year, it starts tomorrow, March 28th.
January 1, 1973 fell on a Monday. As of 2011, the next year to start on a Monday will be 2018.
16 October 1974 was a Wednesday.
January 1 1974 was a Tuesday.
20 July 1974 was a Saturday.