September 23, 1986 was a Tuesday.
Saturday
It was a Sunday.
September 23rd, 1989 fell on a Saturday.
Saturday
It was a Sunday.
It was a Tuesday.
September 4 1986 was a Thursday.
18 September 1986 was a Thursday.
Sept. 29 1986 was a Monday: Source = http://www.courts.sa.gov.au/lawyers/magistrates_benchbook/perpetual_calendar/1901to2100calendar.htm
It's usually on the 23rd of September. (My name is Autumn, based on my birthday, which is the first day of autumn....the 23rd of Sept.)
January 23rd, 1900 was a Tuesday.
March 23rd 1999 was a Tuesday.