English vocabulary for time identifiers

I looked for this in the Wiki and SL forums and unaccountably didn't find a previous answer, so here's my question.

In English we refer to time identifiers like 1AM, 2:30PM, etc. as "time of day", as in "What was the time of day at that point?".

However we sometimes identify the time as morning, noon, evening, etc. Is there a generic name for these words, e.g. "Part of day"? I'm unaware of such a word.

In my business, those are dayparts. For instance, you have morning, mid-morning, noon, afternoon, evening, prime-time, late-night, and overnight.

"Time of day" usually refers to the general temporal range: morning, afternoon, evening, late night, early morning.

"The Time" or just "Time" refers to a precise temporal measurement: 12:50 PM. 1725 hours.

Here is a sample conversation:

"John, what time of day was it?"
"Late in the afternoon, I think. Yeah, I'm sure it was, cause I went home not long after."

as opposed to:
"John, what time did it happen?"
"I think it was about 4:30, boss. Yeah, I know it was, cause it took me like 20 minutes to clean up, and the whistle blew as I was puttin' the mop away."

and in SL (and international business) the time zone is vital too. Air people talk about "Zulu", which is the time in London - "I'll call you at 14:30 zulu"