Retrieving the first and last day of previous month to build a query with a range date?

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Just another note that since Elixir 1.17, you can shift a date using Date.shift/2.

So, to get the beginning and end of the previous month, you could do:

beginning_of_previous_month = 
    Date.utc_today() 
    |> Date.beginning_of_month()
    |> Date.shift(months: -1)

end_of_previous_month = Date.end_of_month(beginning_of_previous_month)