Problems with THEN

[Connectingpeople]

I don't know why people sometimes say " By then " or " Then ". I know that "Then" is used to show conclusion or something like that. But what does " By then" mean ?
Please show me the difference. Thanks

[Casiopea]

Welcome.

By then means by the/that time.

[Connectingpeople]

You mean " Exactly at the time " ?

[Casiopea]

Would you have an example? Here's mine:

EX: By the time I get home, which will be around 8:00 or 8 o'clock on the dot, you'll have finished dinner.

[doodles]

In conversation, if someone says "I'm going home now" the other person could reply by saying "Bye then." This means that in conclusion of what the first person has said, the second person acknowledges their departure.

[Casiopea]

Doodles, we're looking at a temporal adverb, "by then", not (Good-)bye, then.

[Connectingpeople]

So it's about time....I got it .!!! Thanks

[Casiopea]

You're welcome.

[doodles]

My apologies .. I was having a bad day