INT 21,2A - Get Date

	AH = 2A


	on return:
	AL = day of the week (0=Sunday)
	CX = year (1980-2099)
	DH = month (1-12)
	DL = day (1-31)


	- retrieves system date based on the DOS maintained clock
	- updates BIOS Data Area current date and date rollover flag
	  at location 40:70