A good time as forecast? (4,3)

I believe the answer is:

fine day

I'm a little stuck... Click here to teach me more about this clue!

'forecast?' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'a good time' is the wordplay.
'a good' becomes 'fine' (both can mean satisfactory).
'time' becomes 'day' (day is a kind of time).
'fine'+'day'='FINE DAY'

'as' is the link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.