When is the Sabbath?
Biblically, the weekly Sabbath is the seventh day of the week (Exod 20:10). In the New Testament, the “first day of the week” occurs after the Sabbath (Mark 16:1–2), which places the Sabbath the day before Sunday—i.e., Saturday. For more information on How a Biblical Day was determined, Click Here 
When does it start and end?
In Scripture, days are measured from evening to evening: “And there was evening and there was morning…” (Gen 1). For sacred rest days, the command is explicit: “from evening to evening you shall celebrate your sabbath” (Lev 23:32). Practically, this means the weekly Sabbath runs from Friday sundown to Saturday sundown.
- Start: Friday at sunset (“evening”).
- End: Saturday at sunset (close of the seventh day).
- Witness in the Gospels: The Sabbath is the day before the “first day of the week” (Mark 16:1–2; Luke 23:54–56).
This aligns the creation pattern (six days of labor, one day of holy rest) with the weekly rhythm God established.