input: Write a python function to convert a given date string in the format 'YYYY-MM-DD' to a string that represents the day of the week, date, month, year, and time.
  assert get_day_date_time('2023-10-05')=='Thursday, 05 October 2023, 00:00:00'
  assert get_day_date_time('2000-01-01')=='Saturday, 01 January 2000, 00:00:00'
  assert get_day_date_time('1999-12-31')=='Friday, 31 December 1999, 00:00:00'
output: def get_day_date_time(date_string):
      from datetime import datetime
      import calendar
      
      date_obj = datetime.strptime(date_string, '%Y-%m-%d')
      day_of_week = calendar.day_name[date_obj.weekday()]
      formatted_date = date_obj.strftime('%d %B %Y, %H:%M:%S')
      
      return f"{day_of_week}, {formatted_date}"