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(time_utc_offset): new function. (Init_Time): bind above methods to `time_utc_offset'. * time.c: 64bit time_t support. (time_s_at): use NUM2LONG instead of NUM2INT for tv_sec. (time_arg): initialize tm_isdst correctly. use long to initialize tm_year. (search_time_t): renamed from `make_time_t'. (make_time_t): call `timegm' and `mktime' instead of `search_time_t' if availabe. (time_to_i): use LONG2NUM instead of INT2NUM. (time_localtime): check localtime failure. (time_gmtime): check gmtime failure. (time_year): use LONG2NUM instead of INT2FIX. (time_to_a): use long for tm_year. (time_dump): check tm_year which is not representable with 17bit. (time_load): initialize tm_isdst. * configure.in: check existence of `mktime' and `timegm'. check existence of tm_gmtoff field of struct tm. fix negative time_t for 64bit time_t. * missing/strftime.c: fix overflow by tm_year + 1900. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@1912 b2dd03c8-39d4-4d8f-98ff-823fe69b080e