WEEKDAYReturns a number representing the day of the week of the date provided.
date – The date for which to determine the day of the week. Must be a reference to a cell containing a date, a function returning a date type, or a number.
type – [ OPTIONAL – 1 by default ] – A number indicating which numbering system to use to represent weekdays. By default counts starting with Sunday = 1.
If type is 1, days are counted from Sunday and the value of Sunday is 1, therefore the value of Saturday is 7.
If type is 2, days are counted from Monday and the value of Monday is 1, therefore the value of Sunday is 7.
If type is 3, days are counted from Monday and the value of Monday is 0, therefore the value of Sunday is 6.
Ensure that the input to the function is either a reference to a cell containing a date, a function which returns a date object such as DATE, DATEVALUE or TO_DATE, or a date serial number of the type returned by the N function. Google Sheets represents dates internally as numbers for ease of use in calculation, and while this conversion is done automatically when a date in the form of a string is input into a cell, this function does not perform this conversion.
WEEKDAY does not autoconvert number formats in the same way that Google Sheets does upon direct entry into cells. Therefore, WEEKDAY(10/10/2000) is interpreted as WEEKDAY(0.0005), the quotient of 10 divided by 10 divided by 2000.
WEEKDAY returns the day of week in numeric form, not as a letter (e.g. ‘M’ or ‘F’) an abbreviation (e.g. ‘Tue’ or ‘Thu’) nor as a full day name (e.g. ‘Wednesday’). To get the name of the weekday, use the TEXT function or change the number formatting on the cell.
YEAR: Returns the year specified by a given date.
TO_DATE: Converts a provided number to a date.
N: Returns the argument provided as a number.
MONTH: Returns the month of the year a specific date falls in, in numeric format.
DAY: Returns the day of the month that a specific date falls on, in numeric format.
DATEVALUE: Converts a provided date string in a known format to a date value.
DATE: Converts a year, month, and day into a date.
TEXT: Converts a number into text according to a specified format.
Returns the number representing the day of the week for the specified date value.
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