Many a Slip - 1918 was released on: USA: 9 February 1918
None, because those dates never existed in Russia. Russia had been on the Julian Calendar, which was thirteen days behind the rest of the world which was on the more accurate Gregorian Calendar. By order of Vladimir Lenin, Russia switched to the Gregorian Calendar by decreeing that the day after January 31, 1918 would be February 14, 1918 thereby skipping completely over February 1 to February 13, 1918.
13
Russia was behind the West by 13 days because it had been using the Julian Calendar. It changed to the Gregorian Calendar when it was decreed that the day after January 31, 1918 would be February 14, 1918, thereby skipping 13 days.
February 1930, had 28 days.
There was 29 days in February of 1836.
There were 28 days in February 1941.
There were 28 days in February 1954.
In 2002, February had 28 days.
February 2010 has 28 days.
February 2000 had 29 days.
There were 28 days in February 1885.