Is it that we do not apply Liaison with numbers in general or is it only in case of dates.

Bonjour Anish,

If you're asking about this: "you say le onze and NOT l'onze" that's not a liaison, it's elision, and the answer is that is always the case: you cannot ever say l'onze.

If you're actually asking about liaisons (pronouncing the consonant at the end of one word at the beginning of the next), can you please give me an example?

Hi Laura, I meant to ask about elision, not liaison, Merci beacon for the answer.

Not able to edit answers once posted..I meant Merci Beaucoup :-)