What "monday", "the 15th" and "9 o'clock" have in common is that they repeat over and over. Every week has a monday, every month has a 15th and every day has a 9 o'clock. Is there a word for such a phenomenon?
I'm a programmer trying to document a feature of the syntax used to enter these types of things. A specific word would be really useful as I keep having to explain the concept every time I mention it.
So if a specific and unique point in time could be signified by "date" or "datetime" then what would I call these specific but reoccurring points in time?