Number corresponding to the day of the week for the specified date:
1 - Monday
2 - Tuesday
3 - Wednesday
4 - Thursday
5 - Friday
6 - Saturday
7 - Sunday

Date to use. This date can correspond to:

• a character string in YYYYMMDD format (YYYY corresponds to the year, MM to the month and DD to the day).
• a character string in YYYYMMDDHHmmSSCC format (YYYY corresponds to the year, MM to the month, DD to the day, HH to hours, mm to minutes, SS to seconds and CC to hundredths of a second (use CCC for thousandths of a second)). In this case, only the date is taken into account.
• a Date variable.
• a DateTime variable. In this case, only the date is taken into account.