def draw_datetime(f, col_or_sym, options={})
      col_name  = get_column_name(col_or_sym)
      f.text_field(col_name,
          value: datetime_fmt(f.object.send(col_name)))
    end
def draw_datetime(f, col_or_sym, options={})
      col_name  = get_column_name(col_or_sym)
      f.text_field(col_name,
          value: datetime_fmt(f.object.send(col_name)))
    end
draw calendar datetime select

 === INPUTS
 f::           Form builder object.
 col_or_sym::  column object returned by rec.class.columns, or symbol
 options::     passed to calendar_date_select