DTJulianMillisecToDwordDateTime

Converts Julian date integer value and total milliseconds to DWORD values containing date and time information. On return EAX contains the date information and EDX the time information.

DTJulianMillisecToDwordDateTime PROTO JulianDate:DWORD, Milliseconds:DWORD

Parameters

JulianDate - A DWORD value containing the Julian date integer to convert to a DWORD date in EAX.
Milliseconds - A DWORD value containting the total milliseconds to convert to hours, minutes, seconds and milliseconds in DWORD time in EDX.

Returns

On return EAX will contain the date information in the following format:

EAX Register Bits:

+------------------------+------------+-----------+
| WORD                   | BYTE       | BYTE      |
+------------------------+------------+-----------+
| Bits 31-16             | Bits 15-8  | Bits 7-0  |
+------------------------+------------+-----------+
| Century Year           | Month      | Day       |
+------------------------+------------+-----------+
| CCCCYY                 | MM         | DD        |
+------------------------+------------+-----------+

On return EDX will contain the time information in the following format:

EDX Register Bits:

+------------+------------+-----------+-----------+
| BYTE       | BYTE       | BYTE      | BYTE      |
+------------+------------+-----------+-----------+
| Bits 31-23 | Bits 23-16 | Bits 15-8 | Bits 7-0  |
+------------+------------+-----------+-----------+
| Hour       | Minute     | Second    | Millisec  |
+------------+------------+-----------+-----------+
| HH         | MM         | SS        | MS        |
+------------+------------+-----------+-----------+

Notes

The registers always return the information in the format shown in the tables above.

Example

.data?
dwDate dd ?
dwTime dd ?
Year dw ?
Month db ?
Day db ?
Hours db ?
Minutes db ?
Seconds db ?
Millisec db ?

.code
Invoke DTJulianMillisecToDwordDateTime, 2299161, 0
mov dwDate, eax ; eax contains the date information
mov dwTime, edx ; edx contains the time information

mov eax, dwDate
shr eax, 16 ; move year into upper word of eax
mov Year,  ax ; year
mov eax, dwDate
mov Month, ah ; month
mov Day, al ; day

mov eax, dwTime
shr eax, 16 ; move hour and minute into upper word of eax
mov Hours, ah ; hours
mov Minutes, al ; minutes
mov eax, dwTime
mov Seconds, ah ; seconds
mov Millisec, al ; millseconds