I've noticed a few posts (and it is only a few—maybe a handful) which are missing the year and time from the timestamp—The year is replaced with
\yy and the time is replaced with
The timestamp shows as expected in the revision log (in the app) and everywhere on the site.
For example: two answers on this Meta Stack Exchange question
- App Version: 188.8.131.52
- Device: iPhone 6s
- OS Version: Version 10.0.1 (Build 14A403)