anno=function(x,sep=";"){
ifelse(is.character(x), # the input is a character variable
as.numeric(unlist(strsplit(as.character(x),split=sep))[1]) +
as.numeric(unlist(strsplit(as.character(x),split=sep))[2])/12 ,
paste(floor(x), round(((x-floor(x)) * 12),0) , sep=";")
)}
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