WEEKDAY()

Returns the day of the week as a Number (1 to 7; 1 is Sunday) if date is recognized, or 0 if not (that is, if the input is invalid).

Sample usage

WEEKDAY("1/1/2019") : 3

INDEX(LIST("Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"), WEEKDAY("1/1/2019")) returns Tue (Text).  See also: INDEX(), LIST()

WEEKDAY(TODAY()) returns today's numeric day of the week. See also: TODAY()

(TODAY() - WEEKDAY(TODAY())) returns date of Saturday last week.

(TODAY() - WEEKDAY(TODAY()) + 6) returns date of Friday this week.

(TODAY() - WEEKDAY(TODAY()) + 7 + 4) returns date of Wednesday next week.

([Weekday] - WEEKDAY(TODAY()))returns offset of this week's [Weekday] (1 = Sunday, ..., 7 = Saturday) from today (for example, 0 = today, -1 = yesterday, 1 = tomorrow).

(TODAY() + ([Weekday] - WEEKDAY(TODAY()))) or (perhaps more intuitively) (TODAY() - WEEKDAY(TODAY()) + [Weekday])returns the date of [Weekday] within the current week.

([Date] + ([Weekday] - WEEKDAY([Date]))) or ([Date] - WEEKDAY([Date]) + [Weekday]) returns the date of [Weekday] within a week containing [Date].

MOD(([Weekday] - WEEKDAY([Date]) + 7), 7) returns the offset of the [Weekday] on or after [Date]. See also: MOD()

MOD(([Weekday] - WEEKDAY([Date]) - 7), 7) returns the offset of the [Weekday] before or on [Date].

([Date] + MOD(([Weekday] - WEEKDAY([Date]) + 7), 7)) returns the date of the first [Weekday] on or after [Date].

([Date] + MOD(([Weekday] - WEEKDAY([Date]) - 7), 7)) returns the date of the first [Weekday] before  or on [Date].

([Date] - DAY([Date]) + 1) or (EOMONTH([Date], -1) + 1) returns the date of the first of the month containing [Date]. See also DAY(), EOMONTH()

(([Date] - DAY([Date]) + 1) + MOD(([Weekday] - WEEKDAY([Date] - DAY([Date]) + 1) + 7), 7)) returns the date of the first [Weekday] of the month containing [Date].

(EOMONTH([Date], 0) + MOD(([Weekday] - WEEKDAY(EOMONTH([Date], 0)) - 7), 7)) returns the date of the last [Weekday] of the month containing [Date].

((([Date] - DAY([Date]) + 1) + MOD(([Weekday] - WEEKDAY([Date] - DAY([Date]) + 1) + 7), 7)) + (([Ordinal] - 1) * 7)) returns the date of the [Ordinal]-th [Weekday] of the month containing [Date].

Syntax

WEEKDAY(when)

• when - A Date or DateTime value.

Note

Some constant values, such as "MM/DD/YYYY", are evaluated as a Date value by AppSheet. Similarly, "000:00:00" is evaluated as a Duration value. This doesn't mean your spreadsheet data must use the same formats: the date and time formats in your spreadsheets are determined by the locale/language setting. Column will always be evaluated as the type of column. Additionally, you can convert data, both columns and string literals, to specific types using functions such as DATE(), TIME(), or DATETIME(). 

See also

Date and time expressions

DAY()

EOWEEK()

EOMONTH()

WEEKNUM()

WORKDAY()