週次同埋每個禮拜嘅第幾日：呢個系統唔常見，佢嘅特點係無年，每隔一個禮拜，週次就會加一。年同埋呢年入面嘅第幾日：例如ISO 8601嘅順序日期表示法。
Weeks and days of the week: this system is uncommon, it is characterized by no year, and every other week, the week is added by one. Year and the day of the year: e.g. ISO 8601 sequential date notation.