If you promise to meet someone at a certain time, you should be at the appointed place at the appointed hour.

如果你答应和某人在某时会面时，你就应该在约定的时间和地点到达。

youdao

So why should someone who is going to work at the appointed hour think that he or she is fully prepared for the day?

一个准时上班的人怎能认为他已为当天的工作做好了充分准备呢？

youdao

But her supervisor appointed her to the new job at the eleventh hour at the very last minute.

VOA: special.2009.07.26

Many of the city's million residents are believed to have flushed at the appointed hour.

BBC: Synchronised toilet flush held in Zimbabwe's Bulawayo

Christmas Eve at the appointed hour we assembled in the chapel.

NPR: Kate Nolan, WWII Combat Nurse

According to press reports at the time, he spent the appointed hour on a 68-foot houseboat owned by the charity.

FORBES: Charity begins with a commission