我需要給你回推 (延遲) 這些到期日.
In English there are 3 common words have the meaning of "延遲" :
Even though in Chinese they might be the same, but in English they are not interchangeable. For examples:
If something will be pushed back in time by a few hours, it's delayed.
Weather can delay the departure of a plane.
When something is pushed back to a specific date, days or even weeks later, it's postponed.
I-Phone5 might be postponed because one of key technologies cannot be overcome.
On the other hand, something like a product that is supposed to be released can be "delayed" (not postponed) for months.