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	Выходные
1 or omitted	Суббота и воскресенье
2	Воскресенье и понедельник
3	Понедельник и вторник
4	Вторник и среда
5	Среда и четверг
6	Четверг и пятница
7	Пятница и суббота
11	Только воскресенье
12	Только понедельник
13	Только вторник
14	Только среда
15	Только четверг
16	Только пятница
17	Только суббота

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.