Single word for denoting "various divisions of the day" [duplicate]

Possible Duplicate:
What is the category name to describe “day”, “night”, or “dusk”?

What would be the hypernym for the various divisions of the day such as morning, noon, evening or night?

Solution 1:

Though not a single word, "time of day" is used when referring to a particular part of the day, as in your examples.

"What time of day did the crime occur?".

"Early morning."

Solution 2:

Arbitrary divisions of time are often called periods.

Sometimes the word hour itself is used, as a synecdoche, to represent part of a day. Cf. the morning hour, the midnight hour, the dinner hour, etc.