Date.WeekOfMonth

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The M Code Behind the Power Query M function Date.WeekOfMonth

What is the Date.WeekOfMonth function?

The Date.WeekOfMonth function is a built-in function in Power Query that returns the week number of the month in which the given date falls. The function takes a date value as input and returns a whole number between 1 and 5, representing the week number of the month. If the date falls in the first week of the month, the function returns 1. If the date falls in the second week of the month, it returns 2, and so on, up to 5 for the last week of the month.

Here is an example of how the function works:

`Date.WeekOfMonth(#date(2022, 11, 15))`

This returns `3`, because November 15, 2022 falls in the third week of the month.

The M code behind the Date.WeekOfMonth function

The M code behind the Date.WeekOfMonth function is relatively simple. Here is the code:

let

WeekOfMonth = (dateValue as date) =>

let

FirstDayOfMonth = Date.StartOfMonth(dateValue),

DayOfWeek = Date.DayOfWeek(FirstDayOfMonth),

DaysFromStart = Date.Day(dateValue) – 1,

DaysFromFirstWeekStart = 7 – DayOfWeek,

WeeksFromStart = Number.RoundDown((DaysFromStart + DaysFromFirstWeekStart) / 7),

WeekOfMonth = WeeksFromStart + 1

in

WeekOfMonth

in

WeekOfMonth

The function takes a dateValue as input and returns the week number of the month in which the date falls. Let's break down the code and understand how it works.

1. We first define a function called WeekOfMonth that takes a dateValue as input.

WeekOfMonth = (dateValue as date) =>

2. We then define four variables: FirstDayOfMonth, DayOfWeek, DaysFromStart, and DaysFromFirstWeekStart.

FirstDayOfMonth = Date.StartOfMonth(dateValue),

DayOfWeek = Date.DayOfWeek(FirstDayOfMonth),

DaysFromStart = Date.Day(dateValue) – 1,

DaysFromFirstWeekStart = 7 – DayOfWeek,

3. We then calculate the number of weeks from the start of the month. We do this by subtracting the number of days from the start of the month from the number of days from the first week start, and then dividing the result by 7.

WeeksFromStart = Number.RoundDown((DaysFromStart + DaysFromFirstWeekStart) / 7),

4. Finally, we add 1 to the WeeksFromStart variable to get the week number of the month.

WeekOfMonth = WeeksFromStart + 1

5. We then return the WeekOfMonth variable.

in

WeekOfMonth

Use cases for the Date.WeekOfMonth function

The Date.WeekOfMonth function can be used in a variety of scenarios. Here are some examples:

1. Sales reporting

Suppose you have a sales dataset with a date column. You can use the Date.WeekOfMonth function to group the sales data by week of the month. This can be useful in identifying trends and patterns in sales over the course of a month.

2. Payroll processing

If you are responsible for processing payroll for employees, you can use the Date.WeekOfMonth function to determine the week number of the month in which an employee's paycheck should be issued. This can help ensure that paychecks are issued on time and that employees are paid accurately.

3. Event planning

If you are planning an event that spans multiple weeks, you can use the Date.WeekOfMonth function to determine the week number of each event date. This can help you schedule and coordinate events more efficiently and ensure that events do not overlap.

The Date.WeekOfMonth function is a powerful tool in Power Query that can be used to determine the week number of the month in which a date falls. By understanding the M code behind the function, you can gain a deeper insight into how the function works and how it can be used. Whether you are working with sales data, processing payroll, or planning events, the Date.WeekOfMonth function can help you work more efficiently and effectively with dates and times.

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