曆法都分完整同唔完整。完整曆法會為每一日設定一個日子，而唔完整曆法就唔會。例如古羅馬曆無為冬天嘅日子設計日子，直接跳過，統稱為冬日，就係唔完整曆法嘅一種，大部份嘅曆法都係完整曆法。
The calendar is also divided into complete and incomplete. A full calendar sets a day for each day, while an incomplete calendar does not. For example, the ancient Roman calendar did not design days for winter days, and they were directly skipped, collectively known as winter days, which is a kind of incomplete calendar, and most calendars are complete calendars.