last_date_month<-function (date_ini){
date_initial = as.Date(paste0("01/", format(date_ini, "%m/%Y")), "%d/%m/%Y")
last_date=date_initial
for(i in 1:length(date_initial)){
last_date[i] = tail(seq(date_initial[i], by = "month", length = 2), 1) - 1
}
return(last_date)
}
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