negation + and

[Navi]

Can one use:
1-If we don't talk to each other today and tomorrow, then we will talk day after tomorrow.
instead of:
2-If we don't talk to each other today or tomorrow, then we will talk day after tomorrow.

[Mister Micawber]

Yes, in spite of the logic, the listener would understand the synonymity.
_________________
Native English teacher at Mister Micawber's

[Beeesneees]

Hi Navi,

One minor additional point... in both versions you need a definite article:
... then we will talk the day after tomorrow.
_________________
Cheers m' dears!

[Alan]

Hi,

I don't think there is an absolute 'need' for the definite article in this conversational exchange.

Alan
_________________
English as a Second Language
You can read my ESL story Present Simple

[Beeesneees]

No surprises there then.

Navi - I suggest you refer to other sources, where I am confident that you'll find that the adverbial of time is always the day after tomorrow.
_________________
Cheers m' dears!