Postdating rhymes with:
dating, sedating, updating, abating, annotating, awaiting, baiting, berating, crating, creating, dating, debating, deflating, elating, equating, gating, grating, hating, inflating, innovating, mating, misstating, negating, overrating, plaiting, plating, procreating, rating, reinstating, relating, restating, sedating, skating, slating, stating, translating, updating, waiting, weighting
Postdating sounds like:
pakistan's, pakistanis, pastimes, pasting, picketing, pistons, pocketing, poseidon's, positioning, positions, posthumous, posting, postings, pseudomonas, pseudonyms, psychodynamic