This does exist as a concept, though I agree that "timestamp" is not a good name for that concept. The Java standard library calls it LocalTime. It is necessary

This does exist as a concept, though I agree that "timestamp" is not a good name for that concept. The Java standard library calls it LocalTime. It is necessary to attach time zone information in order to determine an Instant. The big problem with the python API, in my opinion, is that they conflate these two very different concepts in a single type.