That said, you've got a couple of things going for you:
* We don't give much of a damn about 12 hour clocks
* We give even less of a damn about CRe's header
* The sane (e.g., strftime) approach requires compiled locales for the target language, and that's a non-starter on Kobo, because they don't compile *any* locales. So it'd effectively always show AM/PM anyways.
I don't recall how well Kindles handle non-English locales on that front.
* AFAIK, there aren't many languages that actually both prefer 12h clocks *and* have a localized variant, and I'm even less sure if we actually support any of those
.