Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE employees (hire_date VARCHAR, first_name VARCHAR)

### Question ###
when is the hire date for those employees whose first name does not containing the letter M?

### Accurate SQL ###

SELECT hire_date FROM employees WHERE NOT first_name LIKE '%M%'