INT 15 - APM SL Enhanced v1.0 - GET CALENDAR EVENT DATE

	AX = 5380h
	BH = 0Ah
Return: CF clear if successful
	    SI = century
	    DI = year
	    CH = month
	    CL = day
	CF set on error
	    AH = error code (see #00483)
Desc:	reads calendar event date from Extended CMOS ram
SeeAlso: AX=5380h/BH=08h,AX=5380h/BH=0Bh,AX=5380h/BH=0Ch,AX=5380h/BH=7Fh