Good afternoon, I need to express a date range, it's for an advertisement so not a formal affair. My difficulty is the amount of conflicting opinions on how dates should be written. Anyway, the sentence would be: Take advantage of the offers between the 15th and 26th of December!
Is this correct or can it be shortened by not using ordinals? Or, should it be written in another way completely?
I'd mention that it's directed to a mainly British audience.