重复规则+vCalendar
重复规则： 该属性由属性名称 RRULE 标识。 此属性基于 XAPIA 的 CSA 的基本重复规则语法，定义重复 vCalendar 实体的规则或重复模式。 该属性的值是重复的模式规范。 下面是这个属性的一个例子：
RRULE:W2 TU TH // Every other week, on Tuesday and Thursday
RRULE:D1 #10 // Daily for 10 occurrences
RRULE:YM1 6 7 #8 // Yearly in June and July for 8 occurrences
Support for this property is optional for implementations conforming to this specification.
所以对于这个“重复规则”是他们的任何算法，这样很容易开发它。
Recurrence Rule:
This property is identified by the property name RRULE. This property defines a rule or repeating pattern for a recurring vCalendar entity, based on the Basic Recurrence Rule Grammar of XAPIA's CSA. The value for the property is a pattern specification for the recurrence. The following is an example of this property:
RRULE:W2 TU TH // Every other week, on Tuesday and Thursday
RRULE:D1 #10 // Daily for 10 occurrences
RRULE:YM1 6 7 #8 // Yearly in June and July for 8 occurrences
Support for this property is optional for implementations conforming to this specification.
so for this "Recurrence Rule" is their any algorithm so that it is easy to develop it.
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对我来说，算法就是您在这里提到的..即“RRULE”..您可以对其进行“逆向工程”以开发应用程序/模块以将其输出回来..所以它取决于您（即开发人员）如何获得以此格式输出。
我知道这不是一件容易的事，因为在我想出一些接近的解决方案之前我已经玩了一段时间了。 您可以通过创建一个表（例如事件）来尝试一些基本的调度程序，其中包含一些字段，例如recurrence_type（daily，monthly，weekly，monthly_by_day，monthly_by_date），repeat_until，num_occurrences等。
要拥有RRULES的所有组合，它必须为了输出所需的格式非常复杂。 我在 PHP/MySQL 中尝试过。
To me algorithm is what you have mentioned here .. i.e. "RRULE" .. you can "reverse-engineer" it to develop an application/module to output it back .. so its on to you (i.e. developer) to how to get output in this format.
I know that its not an easy job as I have played with around for a time before I came up with somewhat near solution. You can try some basic scheduler by creating a table, say events, with some of the fields like recurrence_type (daily, monthly, weekly, monthly_by_day, monthly_by_date), repeat_until, num_occurences etc.
To have all of the combinations of the RRULES it has to be very complex in order to output the desired format. I had tried it in PHP/MySQL.