On what date is the interest charged and aculated on the TD line of credit account?

I just started using my line of credit today, to pay off a loan of 11,000 CAD that has a higher interest rate. When will my first interest charge be added on my line of credit account? WIll it be on the last day of the month, or on the day I started using the line of credit (the same way it was working on my loan)?