In the U.S. it will be in 2015.
23rd May 1981, was a Saturday.
The last time that May 27th fell on a Saturday was in 2006
In a 28-year cycle, which, for the sake of convenience, lasts from 2011 to 2038, May 16 will fall on a Saturday in the years: 2015, 2020, 2026, and 2037.
The last two times that May 16 fell on a Saturday were in 1998 and 2009.
Saturday
The odds of May 7 falling on a Saturday are exactly 14.5%. In other words, May 7 fall on a Saturday an average of 14.5 times per century, or once every 6.8966 years.
In a 28-year cycle, starting in 1984 and ending in 2011, May 5 fell on a Saturday in the years: 1984 1990 2001 2006 For further years in which May 5 falls on a Saturday, add 28 to these years.
1991, 1996 and 2002.
2008, 2014, 2025, 2031, 2036, etc.
That was a Wednesday.
Monday
March 1st falls on a Saturday every 11 years. The last time was in 2003, so the next occurrence will be in 2014