It is possible to write a NULL Date by DBFWriteNULLAttribute where a subsequent call to DBFIsAttributeNULL returns false due to handling only "0" and "00000000" as valid NULL Date strings. This is fixed by writing NULL Date independently of the field width.
Edit: There are other fixes possible, e.g. for width of 1 and 8 to be more backward-compatible w.r.t. binary content or by considering the field width when reading the Null string.
It is possible to write a NULL Date by
DBFWriteNULLAttributewhere a subsequent call toDBFIsAttributeNULLreturns false due to handling only"0"and"00000000"as valid NULL Date strings. This is fixed by writing NULL Date independently of the field width.Edit: There are other fixes possible, e.g. for width of 1 and 8 to be more backward-compatible w.r.t. binary content or by considering the field width when reading the Null string.