(toNumber(formatDate(prop("날짜"), "E")) == 1) ? "Mon" : ((toNumber(formatDate(prop("날짜"), "E")) == 2) ? "Tue" : ((toNumber(formatDate(prop("날짜"), "E")) == 3) ? "Wed" : ((toNumber(formatDate(prop("날짜"), "E")) == 4) ? "Thr" : ((toNumber(formatDate(prop("날짜"), "E")) == 5) ? "Fri" : ((toNumber(formatDate(prop("날짜"), "E")) == 6) ? "Sat" : ((toNumber(formatDate(prop("날짜"), "E")) == 7) ? "Sun" : ""))))))