[Doxygen-develop] PATCH: date/time format

[Boaz K. <boa...@ya...>]

Currently, date/time strings in the generated 
documentation are based on local-time, and appear
in a fixed (hard-coded), English-based format.
I'd like to have better control on the format,
and optionally use UTC time.
The attached patch introduces three new 
configuration options:
  DATETIME_FORMAT strftime(3) format for date/time
  DATE_FORMAT     strftime(3) format for date
  UTC_DATETIME    if YES, use UTC time; else use local time

The default values for these options preserve the
current behavior (but see caveat below).

Caveat: The resulting date/time strings might be 
        locale-dependent. To correctly emulate the
        current behavior, one must set the environment
        to use the default (C) locale before running doxygen.

Portability note: The new code should work on all Unix-like
systems, as well as Windows (at least with MS Visual C++).
The existing code uses Qt code that seems to also support 
OS/2 and DOS, which the new code, most likely, does _not_
support. I wasn't sure if doxygen itself is expected to support
these platforms; to be on the safe side, the new code is 
conditioned on not being executed in any of these platforms,
so if doxygen used to work there, it should still work, only
without these new options. If these platforms are not really
supported, some #ifdef's and #ifdef'ed code (all marked with
FIXME comments) can be safely removed.

-- Boaz

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