Is that Saturday or Sunday?
The Hebrews observed the Sabbath, which is our Saturday. Therefore it would be logical for God to have begun his work on Sunday.
begining at sun down, sun up, or midnight?
Did they remember to account for the 10 days dropped in 1582. (4 October 1582 was followed by 15 October 1582)
To make it more interesting yet, not everyone changed over in 1582, so...
eleven days were dropped from the month of September 1752. An eleven-day adjustment in 1752 was needed because one more day had been lost since the calendar was changed in 1582. The year 1751 began on 25 March and ended on 31 December 1751. The first day of the year was now January 1st and the last day was December 31st—the calendar we use today. Thus, 2 September 1752 was followed by 14 September 1752. In this way, the Julian calendar added one day between 1582 and 1752. ...
... Double Dating Double dating was used in Great Britain, colonial British America, and British possessions to clarify dates occurring between 1 January and 24 March on years between 1582 and 1752. In the ecclesiastical or legal calendar, March 25th was recognized as the first day of the year and was not double dated. Researchers of colonial American ancestors will often see double dating in older records. Double dates were identified with a slash mark (/) representing the Old and New Style calendars, e.g., 1690/1691. Even before 1752 in colonial America, some educated clerks knew of the calendar change in Europe and used double dating to distinguish between the calendars. This was especially true in civil records, but less so in church registers. Researchers will often see this type of double dating in New England town records, court records, church records, and wills, or on colonial gravestones or cemetery transcriptions. The system of double dating ended in 1752 in the American colonies with the adoption of the Gregorian calendar.