ä¸ã¶æåã®ä»æ¥ãåå¾ããã«ã¯ NSCalendar *calendar = [[NSCalendar currentCalendar]; NSDateComponents *comps = [[[NSDateComponents alloc] init] autorelease]; comps.month = -1; NSDate *date = [calendar dateByAddingComponents:comps toDate:[NSDate date]]; ä»æã®1æ¥ãåå¾ããã«ã¯ NSCalendar *calendar = [[NSCalendar currentCalendar]; unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit; NSDateComponents *comps = [calend
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