func zipArchives(cfg *conf.Config, dirStr string) error {
//subtract a month so we don't zip the month represented by current date - ZipAgeDays
maxTime := cfg.ZipTime().AddDate(0, -1, 0)
count, err := cfg.EachMonth(dirStr, maxTime, zipArchive)
if err == nil {
fmt.Printf("Zipped %d folder(s)\n", count)
}
return err
}
