这种方法的缺点是计算事件日期时需要复杂的算法。
The disadvantage to this approach is the complex algorithm required to calculate the event dates.
有时，它会提供额外的信息，比如一个唯一ID或一个事件日期。
Sometimes it gives additional information, such as a unique ID or an event date.
当保存初次约会时，该方法计算出所有重复事件日期，并为每个日程表日期生成一个单独的文档。
When the initial appointment is saved, all recurring event dates are calculated and a separate document is generated for each calendar date.
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