Biblical days are numbered, not named, except for the Seventh Day (Yom Shibi'i) which is also known as Shabbat or the Sabbath. Each day starts at sunrise and last 24 hours until the following sunrise. Days do not begin and end at midnight as in the Roman system used by the world or at sunset as in the Talmudic Jewish system. Thus, for example, Yom Rishon might begin on a Roman Wednesday morning at sunrise and end on the following Roman Thursday morning at sunrise. Yom Shanee would then begin at sunrise on the Roman Thursday.

Each day of the four biblical 7-day weeks in each month is a recapitulation of one of the 7 annual Messianic Israelite communal festivals of Yahweh and are used by us as families and privately to meditate on the meaning of the moedim. The Sabbath Day thus becomes the culmination of a week's spiritual exercises in which the individual soul celebrates the overcoming in one week's activities and leading to spiritual rest and renewal in Yahweh. Each day is also presided over by one of the seven Ruachs such that (for example) Yom Revee is presided over and blessed by the Ruach haRevee who also presides over and blesses Shavu'ot. Note also that Chag haMatzah and Sukkot are also 7-day recapitulations.

Roman days are numbered 1 to 7 like the biblical ones. However, only occasionally does, for example, the first Biblical Day (Yom Rishon) correspond with the first Roman day (Sunday, though in the European Union the days have been renumbered making Roman Monday the first day of their week). Thus there are two different Roman numbering systems in the world, just to make things more confusing. There is also a strong globalist movement to restructure the Roman Calendar into a more symmetrical one called the World Calendar which may become the favourite of the prophesied end-time World Government.

The concept of the 'weekend' is a relatively modern one - an extra 'free day' (Saturday) was introduced as a '(Sunday) Sabbath Preparation day' as it was felt this extra time was needed to prepare for the 'Lord's Day' in Roman Christianity. There are, however, no biblical 'weekends'. We are commanded to work six days and rest on the seventh. There is, however, a biblical 'month-end', as it were, where a Sabbath day is followed by Rosh Chodesh. At other times there is an extra day inbetween them called a 'Preparation Day' which some observe as an ordinary working day and others as an extra Rosh Chodesh. In the days before the flood there may have been three prophetic days in a row, two at the end of the month and one (Rosh Chodesh) at the beginning of the following month, a kind of 'triple 7' or '777'.

For more information on biblical weeks and months, please see Introduction to the Festivals of Messianic Israel.