The value of the year and month components allow an unsigned integer.
年和月组件的值可以是一个无符号整数。
Rank - This property is an integer property that determines the order in which events that occur on the same day will be rendered in a month-to-month view.
排名-这个属性是一个整数属性，决定了在同一天发生的事件将在一个月至三个月的视图被渲染的顺序。
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