I have a column called months in the format yyyy-mm e.g "2010-01" "2010-02" "2010-03". It is in chr but i want to change it to Date format i.e yyyy-mm-dd. How do I add the "dd" to be the first day of every month e.g "2010-01-01" "2010-02-01" "2010-03-01" and convert the column from chr to date format
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