1880's meaning?

[learnerAF]

I know that 1880s means from the year 1880 to 1889, but I've never come across anything like 1880's (i.e., with an apostrophe). Is it correct to write like that?

 

[5jj]

It used to be the standard way, but it's nearly died out now.

 

[Rover_KE]

The apostrophe is needed when possession is implied.

Ethel used to love the the pop music of the 1990s, but wasn't keen on 1990s' fashions.

 

[5jj]

I'd write ... wasn't keen on 1990s fashions without the apostrophe. I think 1990s is functioning adjectivally.