input: Write a python function to convert a date string in the format "%d %B %Y" to ISO format.
  assert convertToISO('25 December 2024') == '2024-12-25T00:00:00'
  assert convertToISO('1 January 2000') == '2000-01-01T00:00:00'
  assert convertToISO('14 February 2023') == '2023-02-14T00:00:00'
output: def convertToISO(date_str):
      from datetime import datetime
      dt = datetime.strptime(date_str, "%d %B %Y")
      return dt.isoformat()