$monthDays = [
                    '1MO'  => \_MD_EXTCAL_1_MO,
                    '1TU'  => \_MD_EXTCAL_1_TU,
                    '1WE'  => \_MD_EXTCAL_1_WE,
                    '1TH'  => \_MD_EXTCAL_1_TH,