D-Programming-Language/phobos — pull request #2227 by jmdavis (2014-06-03 07:45:36+00:00)
Title: More ref return fixes in std.datetime now that the compiler allows them.

Compiler bugs previously returning by ref in several of std.datetime's functions. Fortunately, those bugs have been fixed (probably long since), so we can make those functions return by ref now.