DateTime.IsInNextSecond

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The M Code Behind the Power Query M function DateTime.IsInNextSecond

One of the functions available in Power Query M language is the DateTime.IsInNextSecond function. This function checks if a given date/time value falls within the next second. In this article, we will explore the M code behind this function and how it can be useful in data analysis.

Syntax and Arguments

The syntax for the DateTime.IsInNextSecond function is as follows:

DateTime.IsInNextSecond(dateTime as any) as logical

The function takes a single argument, dateTime, which can be any valid date/time value. The function returns a logical value indicating whether the given dateTime falls within the next second.

M Code Explanation

The DateTime.IsInNextSecond function is implemented in M code as follows:

(dateTime as any) as logical =>

let

nextSecond = DateTime.LocalNow() + #duration(0,0,1),

result = dateTime >= DateTime.LocalNow() and dateTime < nextSecond

in

result

The code begins by defining a parameter, dateTime, which represents the input date/time value.

Next, the code creates a variable called nextSecond, which is calculated by adding one second (#duration(0,0,1)) to the current local date/time (DateTime.LocalNow()). This will give us the date/time for the start of the next second.

Finally, the code checks if the input dateTime falls within the current local date/time and the next second. If the input dateTime is greater than or equal to the current local date/time and less than the next second, the function returns true. Otherwise, it returns false.

Usage and Examples

The DateTime.IsInNextSecond function can be useful in various data analysis scenarios. For example, it can be used to identify events or changes that occur within a specific time window.

Here are some examples of how the function can be used:

Example 1: Counting the number of events that occur within the next second

Suppose we have a dataset that contains the timestamp for each event, and we want to count the number of events that occur within the next second. We can use the DateTime.IsInNextSecond function in a calculated column to achieve this:

= IF(DateTime.IsInNextSecond([Timestamp]), 1, 0)

This formula will return 1 if the event occurred within the next second, and 0 if it did not. We can then sum up this column to get the total number of events that occurred within the next second.

Example 2: Filtering data based on events that occur within the next second

Suppose we have a dataset that contains sensor readings, and we want to filter the data to only show readings that occur within the next second. We can use the DateTime.IsInNextSecond function in a filter expression to achieve this:

= Table.SelectRows(Readings, each DateTime.IsInNextSecond([Timestamp]))

This formula will return a new table that only contains rows where the Timestamp column falls within the next second.

The DateTime.IsInNextSecond function is a useful tool for analyzing data that involves date/time values. By understanding the M code behind the function, we can better understand how it works and how it can be used in various data analysis scenarios.

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