获取当前时间所在当天的本地零点时间

time_point contract::last_zeto_time_point(time_point last_do_time_point) {
   uint64_t days_count = (last_do_time_point.time_since_epoch().count() + (8 * one_hour_msec)) / one_day_msec;
   uint64_t days_msec = days_count * one_day_msec;
   days_msec -= (8 * one_hour_msec);
   return time_point(microseconds(days_msec));
}

获取当前时间所在当天的本地第二天的零点时间

time_point contract::next_zeto_time_point(time_point last_do_time_point) {
   return last_zeto_time_point(last_do_time_point) + microseconds(one_day_msec);
}