An 11 year gap between dates happening on the same day is common. This is because of how a leap year causes a day to be skipped over. If you look at the list for those years below, you can see how the Friday was skipped over. The 18th of December was on a Thursday in 1947. Because 1948 was a leap year, Friday was skipped over and it was on a Saturday in 1948. It took another 5 years for Friday to come around again. No date in 1942 was on the same day of the week again until 1953.
Friday 18 December 1942
Saturday 18 December 1943
Monday 18 December 1944
Tuesday 18 December 1945
Wednesday 18 December 1946
Thursday 18 December 1947
Saturday 18 December 1948
Sunday 18 December 1949
Monday 18 December 1950
Tuesday 18 December 1951
Thursday 18 December 1952
Friday 18 December 1953
A date repeats on the same day either every 5, 6 or 11 years, depending on how leap years fall. The 18th of December was next on a Friday 6 years later, in 1959. Then 5 years later in 1964, 6 years later in 1970 and 11 years later in 1981. Following that pattern on brings you to the years 1987, 1992, 1998, 2009 and 2015. The next time is in 2020. If you follow the gaps you will see there is a pattern of 6, 5, 6, 11 repeating itself.
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