新加坡14天计算方法？

如果8/25下午到达新加坡，9/9凌晨的飞机飞美国（估计9/8号晚上就要到机场）。请问这种情况符合14天规定吗？谢谢！

好像是落地算第0天，然后往后加15天是比较保险的算法？因为飞美国可能还要在此基础上多留十几个小时（考虑到时差）。

新航网页上的说明：

For the avoidance of doubt, the calculation of the 14-day period does not include the day of arrival to a third country and the day of arrival into the United States. For example, if a traveller arrived in Singapore on 1 April, he/she is only allowed to seek entry into United States on or after 16 April.