Day of the week.
From a reputable source:-
In any given year the following days fall on the same day of the week: 4/4, 6/6, 8/8, 10/10, 12/12, 9/5, 5/9, 7/11, 11/7 and the last day of February.
Note that this holds true even for the strange American method of date notation.
For 2019 the common day will be a Thursday.
Re: Day of the week.
True - but I thought the last day of February bit was clever.
next year (2020) the last day of Feb is a Saturday which is the same as 4/4, 6/6, 8/8, 10/10, 12/12, 9/5, 5/9, 7/11, 11/7.
Even though next year is a leap year...