问题
Normally, this is the format of a recurring event ID generated by Google: qmjtng94k5mgge24890nmoasts (26 character alphanumeric)
In some cases, we see that the recurring event ID generated is of the format: qmjtng94k5mgge24890nmoasts_R20160823T180000
I want to know when this kind of event Id is generated ? Specifically, when is a recurring event ID generated with the underscore, capital R, date suffix and the same previous eventId prefix?
回答1:
When recurring event ID generated with the underscore, capital R and date suffix - it means that you edited the existing recurrent event and selected the option "Following events" during saving your changes (e.g. changed the title). The "date" suffix means that your changes are applied to all events starting from that date in the existing series.
Note: if you changed the recurrent pattern and selected the option "Following events", it will generate the brand-new series with completely unique ID (without underscore, capital R and date suffix).
来源：https://stackoverflow.com/questions/42300977/when-recurring-id-is-generated-with-format-previous-event-id-rdate