系统语言

NSString *udfLanguageCode = [[NSUserDefaults standardUserDefaults] objectForKey:@"AppleLanguages"][0];

NSString *pfLanguageCode = [NSLocale preferredLanguages][0];

NSString *localeLanguageCode = [[NSLocale currentLocale] objectForKey:NSLocaleLanguageCode];

系统时间

　NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"]; // 设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制
    NSDate *datenow = [NSDate date];
    NSString *nowtimeStr = [formatter stringFromDate:datenow];//将nsdate按formatter格式转成nsstring
    NSLog(@"nowtimeStr =  %@",nowtimeStr);