Sabbath, New Moon, & Feast Days-  Ordinance forever

A Biblical “day” begins and ends at sunset, rather than at midnight. In Genesis 1:5 [KJV], the story of creation, it says,

“And the evening and the morning were the first day.” 

From this, we conclude that a day begins with evening, that is, sunset. Sabbath, New Moon, & Feast Days Begin the evening before the date specified and end at nightfall of the date specified, that is, at the time when it becomes dark outside, about an hour after sunset. Leviticus 23:32b [KJV]

“from even unto even, shall ye celebrate your sabbath.”

2Ch_2:4  Behold, I build an house to the name of the LORD my God, to dedicate it to him, and to burn before him sweet incense, and for the continual shewbread, and for the burnt offerings morning and evening, on the sabbaths, and on the new moons, and on the solemn feasts of the LORD our God. This is an ordinance for ever to Israel