DdEncodeNumericDate() - convert atomic date info to encoded integer

DdEncodeNumericDate() - convert atomic date info to encoded integer DdEncodeNumericDate() - convert atomic date info to encoded integer

   WtInt32 DdEncodeNumericDate(
      /* result is encoded date in days since 1753.01.01 (1-rel) */
      WtInt32 year,       /* [IN] - year in binary (1753-5999) */
      WtInt32 month,      /* [IN] - month in binary (1-12) */
      WtInt32 day,        /* [IN] - day in binary (1-31) */
      WtInt32 *jderr);