Register parameters
RST 20H, DEFW $1409
IN: ABC = internal format date (as returned by GN_Gmd) (A is most significant byte, C is less significant byte) OUT, if call successful: Fc = 0 A = number of days in month (eg. 28 if date is in Feb 1989) B = month (1 = January, 12 = December) C = C7 to C5: day of the week (1=Monday, 7=Sunday) C4 to C0: day of the month (1 to 31) DE = Signed year number (relative to 0 A.D.). B.C. years are negative numbers. OUT, if call failed: Fc = 1 (no error code) Date out of range (eg. beyond 32767 A.D.) Registers changed after return: ......HL/IXIY same AFBCDE../.... differentÂ
Related calls
GN_Dei, convert zoned external format date to internal format
GN_Gdt, convert an ASCII string to an internal binary date
GN_Gmd, Get (read) machine date in internal format
GN_Pdt, write internal date as ASCII string
GN_Pmd, put (set) machine date