Date.StartOfMonth Function in Power Query
The Date.StartOfMonth function returns the start of the month of the given date.
Syntax
Date.StartOfMonth(dateTime as any) as any
Example: Find the start of the month of the given dates.
Power Query M
let Source = Table.FromRecords( { [Year = "20-07-2024"], [Year = "21-07-2024"], [Year = "22-07-2024"], [Year = "23-07-2024"], [Year = "24-07-2024"], [Year = "25-07-2024"], [Year = "26-07-2024"], [Year = "27-07-2024"], [Year = "28-07-2024"], [Year = "29-07-2024"], [Year = "30-07-2024"], [Year = "31-07-2024"], [Year = "01-08-2024"], [Year = "02-08-2024"], [Year = "03-08-2024"], [Year = "04-08-2024"], [Year = "05-08-2024"], [Year = "06-08-2024"] } ), #"Changed Type" = Table.TransformColumnTypes(Source, {{"Year", type date}}), Return = Table.AddColumn(#"Changed Type", "Start Of Month", each Date.StartOfMonth([Year])) in Return
The output of the above code is shown below: