GN_Gdt, Convert an ASCII string to an internal binary date

Register parameters

RST 20H, DEFW $0609
     HL = source pointer
          0 = read from stream whose handle is IX
          1 = read from filter whose handle is IX
          2 = not allowed
          > 255 = string pointed to by HL
     DE = destination pointer
          0 = not allowed
          1 = not allowed
          2 = result returned in ABC
          >255 = store result at address pointed to by DE
     A = date format
          A0 = 1, undefined
          A1 = 1, undefined
          A2 = 1, undefined
          A3 = 1, force American format (MM/DD/YY)
          A4 = 1, force European format (DD/MM/YY)
          A5 = 1, force C to be the delimiter
          A6 = 1, undefined
          A7 = 1, undefined

     IX = source handle (if HL = 0,1)
     B = maximum number of characters to be read
     C = optional forced delimiter (default is ".")

OUT, if call successful:
     Fc = 0
     HL, if HL(in) = 0, index to last character read
     HL, if HL(in) > 255, pointer to last/terminating character
     ABC, if DE(in) = 2, date in internal format
     ABC, if DE(in) > 255, ABC(in)
     DE, if DE(in) > 255, DE(in)+3
OUT, if call failed:
     Fc = 1
     A = error code:
          RC_ROOM ($07), insufficient memory to make conversion.
          RC_HAND ($08), handles not available for conversion
          RC_BAD ($04), bad parameters
          RC_SNTX ($0C), Bad syntax

Registers changed after return:
     ......../IXIY same
     AFBCDEHL/.... different 


ASCII string have to use the local date string (dates are fully country localized since OZ 4.5).

Setting A3=0 and A4=0 will mean that the PANEL settings for the date format will be used. A3=A4=1 will use European format. The routine will return a syntax error (RC_SNTX) if A5=1 and the character passed in C(in) is not the terminator of the string to be converted. Please note that returned internal format is in high byte low byte register sequense (A = high byte, C = low byte).

Source in HL can not be in segment 1 used by Date Filter Table. Destination in (DE>255) can be inside segment 1.

Related calls

GN_Dei, convert zoned format date to internal format
GN_Die, convert internal format date to zoned format
GN_Gmd, Get (read) machine date in internal format
GN_Pdt, write internal date as ASCII string
GN_Pmd, put (set) machine date

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