--- sec
--- min
--- hour
--- mday
--- day         (mday ̾)
--- mon
--- month       (mon ̾)
--- year
--- wday
--- yday
--- isdst
--- dst?        (isdst ̾)
--- zone

    ŪݻƤ tm ¤ΤƤ֤ޤzone 
    ʳ֤ޤzone ϥॾɽʸ֤
    ޤ(localtime(3) [manual page] )

    : C  tm ¤ΤȤϰۤʤꡢmonth  1 
     1 ֤year  1998 ǯФ 1998 ֤ޤޤ
    yday  1 ޤ

