取得秒时间

    typedef long time_t;

    time_t t;

    // Get UNIX-style. time and display as number and string

    lr_message ("Time in seconds since 1/1/70: %ld\n", time(&t));

    lr_message ("UNIX-style. time and date: %s", ctime(&t));

Output:
Time in seconds since 1/1/70: 1019382960
UNIX-style. time and date: Sun Apr 21 11:56:00 2002

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要取得毫秒时间，参考以下：

http://blog.csdn.net/jefry_xdz/article/details/8072097

另外一种不太好的方法是，取得秒时间 * 1000，因为 1s = 100ms