As i have mentioned before [click, here too ] these peripatetic brothers were apostles to many lands, and as they wandered to many lands, their feast day has wandered about calendars. Different nations have celebrated, and do still on different days. From 1887 to 1969 on the general Roman calendar their feast day was on the 7th of July. For the Czechs and Slovaks it is still a national holiday on the 5th of July.
A joint issue from Slovakia, Bulgaria, Czech Republic, and Vatican City.
This is the Slovak one from June 12th 2013.