# WEEKDAY

Chandra Bergmann

#### The function WEEEKDAY takes a date or a DateTime and returns a number indicating what day of the week the given date falls on.

This function takes either a single DateTime or a single date as input. It then returns a number indicating what day of the week the given date falls on. Count starts with 1 and Monday (that is, 1 represents Monday, 2 represents Tuesday, 3 represents Wednesday, et cetera).

### Declaration

WEEKDAY(datetime) -> day
WEEKDAY(date) -> day

### Parameters

datetime (type: DateTime)
Any DateTime.
date (type: date)
Any date.

### Return Values

day (type: number)
A number (1-7) indicating what day of the week is described by the given date or DateTime.
Count starts with 1 and Monday (that is, 1 represents Monday, 2 represents Tuesday, 3 represents Wednesday, et cetera).

### Examples

example_date_and_time = { "date": {  "day": 1,  "month": 4,  "year": 2021 }, "time": {  "hour": 16,  "minute": 14,  "second": 38,  "millisecond": 0 }, "timeZone": "UTC"}

The date described in example_date_and_time is April 1st, 2021. This falls on a Thursday, which WEEKDAY indexes as 4. Thus, in the following example, when example_date_and_time is given as input for WEEKDAY, it returns the number 4:

WEEKDAY(example_date_and_time) = 4

The above example demonstrates how the WEEKDAY function behaves when given a DateTime as input. In order to further establish how the WEEKDAY function behaves when given a date as input, assume the last example has access to the following date value:

example_date = { "day": 1, "month": 4, "year": 2021}

Note that the date described in example_date is identical to the date described in example_date_and_time. This is still a Thursday, when example_date is given as input for WEEKDAY, it returns the number 4:

WEEKDAY(example_date) = 4