- It's the first time I've seen him that happy.
- It's the first time I see him that happy.
Are these two sentences correct? If they are, what's the difference between them?
Neither sound correct to me, due to tense.
To me, the two idiomatic phrases would be:
Present tense, while you are in the person’s presence:
It’s the first time I’ve seen him this happy.
Past tense:
It was the first time I’d seen him that happy.