Describes mode for formatting date in header of data legend
Specifies automatic date format that defaults to short string
Specifies date as full string in header row of data legend
Specifies date as long string in header row of data legend
Specifies date as medium string in header row of data legend
Specifies no date in header row of data legend
Specifies date as short string in header row of data legend
Describes mode for formatting date in header of data legend