Package: bsdmainutils Version: 11.1.2+b1 Severity: normal There are two month properties in LC_TIME: mon and alt_mon. mon is the name of month in nominative case and alt_mon is in genitive case. So mon is for 'April 15' form while alt_mon is for stanalone month name like just 'April'.
cal and ncal uses mon but must use alt_mon. While there are no difference in english or español, in russian it's significant. Good link about: https://anzwix.com/a/glibc/Implement%20Alternative%20Month%20Names%20(bug%2010871).
