Correct sceRtcGetDayOfWeek() for odd years.
Implement rtc date formatting funcs.
Use fixed dates for rtc adjusted and reincarnated.

This may be safer in case a game thinks funny business is going on if the
user changed the clock very recently, which wouldn't be the case on a
real PSP.
Merge pull request #6844 from unknownbrackets/rtc-minor

Implement the sceRtc formatting and reincarnated time funcs