code: def check_month_year_comma(text):
      
      err = "dates_times.dates"
      msg = u"When specifying a month and year, no comma is needed."
  
      regex = "(?:" + "|".join(calendar.month_name[1:]) + "), \d{3,}"
      return existence_check(text, [regex], err, msg)
docs: Check the text.