datetime.asm

想学习汇编语言的

TITLE Display the Date and Time     (DateTime.asm)

; This Real-mode program displays the date and time.
; Last update: 12/8/01

Include Irvine16.inc
Write PROTO char:BYTE
.data
str1 BYTE "Date: ",0
str2 BYTE ",  Time: ",0

.code
main PROC
	mov  ax,@data
	mov  ds,ax

; Display the date:
	mov   dx,OFFSET str1
	call  WriteString
	mov   ah,2Ah	; get system date
	int   21h
	movzx eax,dh	; month
	call  WriteDec
	INVOKE Write,'-'
	movzx eax,dl	; day
	call  WriteDec
	INVOKE Write,'-'
	movzx eax,cx	; year
	call  WriteDec

; Display the time:
	mov   dx,OFFSET str2
	call  WriteString
	mov   ah,2Ch	; get system time
	int   21h
	movzx eax,ch	; hours
	call  WritePaddedDec
	INVOKE Write,':'
	movzx eax,cl	; minutes
	call  WritePaddedDec
	INVOKE Write,':'
	movzx eax,dh	; seconds
	call  WritePaddedDec
	call  Crlf

	exit
main ENDP

;---------------------------------------------
Write PROC char:BYTE
; Display a single character.
;---------------------------------------------
	push eax
	push edx
	mov  ah,2
	mov  dl,char
	int  21h
	pop  edx
	pop  eax
	ret
Write ENDP

;---------------------------------------------
WritePaddedDec PROC
; Display unsigned integer in EAX, padding
; to two digit positions with a leading zero.
;---------------------------------------------
	.IF eax < 10
	   push eax
	   push edx
	   mov  ah,2
	   mov  dl,'0'
	   int  21h
	   pop  edx
	   pop  eax
	.ENDIF

	call WriteDec
	ret
WritePaddedDec ENDP

END main