The scriptures do not mention "evening of the seventh day" or "new Sabbaths". You dismiss patterns "evening and morning" being mentionerd for six consecutive days but then you understand YHWH finished his work; evening and morning ended on the sixth day. Then you surmise that evening peceded morning, which would mean , the sixth day ended with a bright light (morning). The seventh day is holy, eternal in nature, a spiritual day no mention of evening and morning. YHWH spoke the world into existence, so as long as evening and morning exists, when evening and morning ended, YHWH ended his work of creation. If a lawyer says "I rest my case" everyone in the courtroom knows he has finished speaking his argument regarding the case; we know Sabbath means rest.