mail labeled move to archive for gmail

mailToArchive.gs

var labels = PropertiesService.getScriptProperties().getProperty('GMAIL_ARCHIVE_LABELS');

function mail_to_archive() {
    var labellist = labels.split(',');
    labellist.forEach(
        function to_archive(value) {
            if (value) {
                var label = GmailApp.getUserLabelByName(value);
                if (label == null) {
                    GmailApp.createLabel(value);
                }
                else {
                    var delayDays = 2 // Enter # of days before messages are moved to archive
                    var maxDate = new Date();
                    maxDate.setDate(maxDate.getDate() - delayDays);
                    var keyword = 'label:' + value + ' label:inbox'
                    var threads = GmailApp.search(keyword);
                    for (var i = 0; i < threads.length; i++) {
                        if (threads[i].getLastMessageDate() < maxDate && !threads[i].isUnread()) {
                            threads[i].moveToArchive();
                        }
                    Utilities.sleep(1000);//呼び出し回数超過のために1秒待機
                    }
                }
            }
        }
    );
}