DateTime::Locale::ja, multiple datetime formats

Hello!

In CLDR version 1.7.1 [1] (on which DateTime::Locale::ja v0.45 is
based) the 'full' and 'long' datetime formats (incorrectly) differed
from the 'medium' and 'short' ones as follows:

full/long: "{1}{0}"
medium/short: "{1} {0}" (space between date and time)

(As of this bugfix[2] included in CLDR v21, all of the formats in
DT:Loc:ja correctly include the space.)

DT:Loc:Base's _make_datetime_format method does not accommodate
different datetime format: it simply uses the result of
$self->datetime_format (which, for DT:Loc:ja, is hardcoded to
"{1}{0}".)


I am not sure if any other locales require multiple datetime styles,
but it is apparent from CLDR's XML that this is supported.

Has anyone else seen a need for multiple datetime style support? Would
it be worthwhile for me to submit a patch for it?

Thanks much,

 -Nate

[1] http://www.unicode.org/repos/cldr/tags/release-1-7-1/common/main/ja.xml
[2] http://unicode.org/cldr/trac/ticket/4220