What are time words doing when they occur after a noun?

Examples:

• People these days have it easy.
• People back then didn’t know about germs.
• The news today makes up for the news yesterday.
• The meeting Monday will complete the agenda from the meeting Friday.

In some cases it can be parsed as an adverb modifying the verb or whole sentence, but not always. And it often seems very tightly tied to the noun.

Since the times can usually be moved into a prepositional phrase (usually of/from), my best guess is a noun adjunct, but noun adjuncts that occur after the noun are supposed to be extremely rare (the only examples I’ve seen were all names).

I found this post but the only answers that make sense are downvoted.