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Weekend is an optional parameter – a number or a string used to specify the days of the week that are weekend days and are not considered working days. Weekend is a weekend number or string that specifies when weekends occur. Weekend number values indicate the following weekend days:

Number 1 to 7 for two-day weekends and 11 to 17 for one-day weekends.

Number | Weekend
--- | ---
1 or omitted | Saturday and Sunday
2 | Sunday and Monday
3 | Monday and Tuesday
4 | Tuesday and Wednesday
5 | Wednesday and Thursday
6 | Thursday and Friday
7 | Friday and Saturday
11 | Sunday only
12 | Monday only
13 | Tuesday only
14 | Wednesday only
15 | Thursday only
16 | Friday only
17 | Saturday only

Weekend string provides another way to define the weekly non-working days. It must have seven (7) characters – zeros (0) for working day and ones (1) for non-working day. Each character represents a day of the week, starting with Monday. Only 1 and 0 are valid. “1111111” is an invalid string and should not be used. For example, the weekend string “0000011” defines Saturday and Sunday as non-working days.

Holidays is an optional list of dates that must be counted as non-working days. The list can be given in a cell range.