There are not totally bad days but two sad events did happen on today’s date.
On this date 1/20,Russia 1918, confiscated all church property and abolished all religious instruction in schools. This of course, followed the October Bolshevik Revolution in ‘17.
And
On this date 1/20, in Berlin, German 1942, the Nazis (at their Wannsee Conference) selected as their “final solution” the mass extermination of all the Jews in Europe.