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I'm applying tags to a set of recorded data files, and I have to classify by when the recording appears to be taken (if it's light or dark).

TimeOfDay: Day
TimeOfDay: Night
TimeOfDay: Dusk 
TimeOfDay: Dawn
TimeOfDay: Night/Day # (the recording spans both Day and Night)

Is there another term to describe "time of day"?

Edit: As per the comments, removed most of the specific constraints - question now focuses on the terminology.

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Could you use daylight? – J.R. Jan 8 '13 at 9:04
@J.R. Do you think that's the best word for the job? – Alex L Jan 8 '13 at 9:11
That's the best word I can think of at the moment, but that doesn't mean it's the best word for the job. – J.R. Jan 8 '13 at 9:15
LightingCondition – mplungjan Jan 8 '13 at 9:24
This question is much too constrained by programming considerations to be on topic here. It is essentially "name my variable" and therefore should be closed off topic. Please see the FAQ. – MετάEd Jan 8 '13 at 13:10
up vote 3 down vote accepted

These periods like day, night, evening, morning, dusk, twilight, afternoon, etc. are simply called "times of day".

Even the National Institute of Standards and Technology calls them that and I suppose that's as official as one can get, at least in the US.

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How about LightingCondition

which I would understand given a choice of day/daylight, night/artificial light no light...

It seems my other suggestion LightSource (Flash/daylight/artificial light) is less relevant for you

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Since diurnal-nocturnal course refers to the whole astronomical day, you can use the phrase DiurnalNocturnalSpan to describe the time of the day, even though not universally applicable. The camera users will automatically use the context and work out to realize that DiurnalNocturnalSpan refers to the time of the day they're working in.

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(In terms of animal behaviour at least) doesn't diurnal refer to day, nocturnal = night, and crepuscular = twilight? – Alex L Jan 8 '13 at 9:45
@AlexL: Yes, I had that doubt in my mind throughout posting it. I've figured out a better phrase. – Parth Kohli Jan 8 '13 at 9:48
You'd think you'd be able to remove the di- and noct- prefixes and just go with UrnalSpan, but apparently that's not supported usage.... – Hellion Jan 8 '13 at 20:21

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