'Appointed' in the Bible

if his offering is a burnt offering from the herd, he is to bring a male without any defect. He is to present it at the entrance to the Tent of Meeting. At the appointed time, it is to be presented in the presence of the LORD so that he may be accepted.

"Tell the Israelis that these are my festival times appointed by the LORD that you are to declare as sacred assemblies:

These are the LORD's appointed festivals and sacred assemblies that you are to declare at their appointed time.

"These are the LORD's appointed festivals that you are to proclaim as sacred assemblies. Bring offerings made by fire to the LORD a whole burnt offering, a meal offering, a sacrifice, and drink offerings. Do this every day on its assigned date

This is what Moses spoke about to the Israelis regarding the LORD's appointed festivals.