Currently, the PVR/Live TV guide will show you the original air date of an episode but not the episode number. However, the On Demand guide does.
Remembering you've watched up to episode #212 is a lot easier than remembering the original air date was 2013/10/03, and a lot easier to pick out when the episodes were recorded out-of-order.
The idea is simple: Include episode numbers along with original air date.
After all, Bell could do it with their satellite 😉
Agreed. In "TV Listings 101" the first lesson is: provide episode numbers. Your message was in 2015 -- it's now 2022 and still nothing.