ios 打印当前时间

设置两个点打印时间测试程序性能

    NSDateFormatter *formatter = [[NSDateFormatteralloc]
init];
    [formatter setDateFormat:@"YYYY-MM-dd hh:mm:ss:SSS"];

    NSDate *datenow = [NSDatedate];
    NSString *nowtimeStr = [formatterstringFromDate:datenow];
    NSLog(@"time 2 =  %@",nowtimeStr);

    NSDate *datenow2 = [NSDate
date];
    NSString *nowtimeStr2 = [formatter stringFromDate:datenow2];
    NSLog(@"time 3 =  %@",nowtimeStr2);