* ReaderFooter:
* Honor the global twelve_hour_clock setting, instead of
duplicating a local one.
(Re #6969)
* os.date is a thin wrapper around strftime, so we might be able to get
away with some not-quite-standard extensions...
These are *definitely* supported on Linux, but are *NOT* the glibc
extension (that'd be e.g., %-I), so, hopefully, they're somewhat
portable...
They are also supported on BSD/macOS.
They are *not* supported by the MS UCRT. That means MinGW-w64, too.
This *appears* to be supported on current Bionic (it might even support
said glibc format altering extensions).
* And of course, Windows is terrible, so, make this terribly ugly to not
break it there...
* Turns out BSD also supports the dash trim format extension, so, leave
the trimming to the libc, and handle the special-casing in a way that
doesn't create stupid locals.
* Random unrelated cleanup ^^.
(https://gitter.im/koreader/koreader?at=5fd24be492aa1c4ef5d11f31)
* Update the testsuite
(Because the default used to be 24h clock).
Changed the default to 24h clock ;p.
* Explain why we don't try to fix it in Lua
32bf53cfdf