哆啦的时光机
使用:1time_t mktime(std::tm *timeptr)然后我们注意到tm这个结构体:1234567891011struct tm { int tm_sec // seconds after the minute 0-61* int tm_min // minutes after the hour 0-59 int tm_hour // hours since midnight 0-23 int tm_mday // day of the month 1-31 int tm_mon // months since January 0-11 int tm_year // years since 1900 int tm_wday // days since Sunday 0-6 int tm_yday // days since January 1 0-365 int tm_isdst // Daylight Saving Time flag};你只要初始化每一个字段就可以得到tm对象,调用mktime方法就可以得到一个time_t对象,于是便可与system_clock中to_time_t方法返回的结果进行比较。