The Eighth Day begins at sundown the night before October 14.
In biblical reckoning, days begin in the evening (Genesis 1:5), when the sun goes down (Joshua 8:29; 2 Chronicles 18:34; Mark 1:32), and are counted “from evening to evening” (Leviticus 23:32). Thus, all God’s festivals begin the sunset just before the dates listed in this table. For example, in 2025 Passover is observed on the evening of April 11, after sundown, and the Feast of Unleavened Bread begins the following evening, April 12. The festivals end at sunset on the dates given.
The Eighth Day teaches us that Jesus Christ will complete His harvest of humans by raising from the dead and extending salvation to all human beings who have died in the past and have never been given a full opportunity for salvation (Ezekiel 37:1-14; Romans 11:25-27; Luke 11:31-32; Revelation 20:11-13). The annual cycle of the celebration of the festivals and Holy Days reminds Christ's disciples that He is working out His plan of extending salvation from sin and death and offering the gift of eternal life in the family of God to all humanity—past, present and future.
To Read more about the Eighth Day click the links below.
http://www.ucg.org/tags/eighth-day