[ Type code = j ] Convert dates to Julian format (for internal storage). May be used in combination with the D, d, or u codes, although if used by itself it will be treated as the combination Dj. Note that the entry parameter must be a string of at least 6 bytes which will hold the string representation of the Julian date value; it may then be assigned to a 2 or 3 byte binary number for more compact storage if desired.