MASM32编程将TimeStamp/UTC转换为具体日期时间的几个有用函数代码

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　　这两天在编写一个读取系统事件日志的程序，其中结构变量EVENTLOGRECORD中成员TimeGenerated和TimeWritten的值为：

The time at which this entry was submitted. This time is measured in the number of seconds elapsed since 00:00:00 January 1, 1970, Universal Coordinated Time.

即从格林尼治时间1970年1月1日夜里12：00开始的秒数。

Windows系统好像没有直接提供将其转换为对应的年月日、时分秒的API函数。

Google了一下，在
http://www.asmcommunity.net/board/index.php?topic=18369.0
找到了donkey网友提供的方法，整理如下：

BaseTimeLow equ 0D53E8000h
BaseTimeHigh equ 19DB1DEh

StampToLocalDateTime proc dwStamp: dword, lpstLocalTime: dword
    local stUtcFileTime: FILETIME
    local stLocalFileTime: FILETIME

    mov eax, dwStamp
    mov edx,10000000
    mul edx
    add eax, BaseTimeLow
    adc edx, BaseTimeHigh

    mov stUtcFileTime.dwLowDateTime, eax
    mov stUtcFileTime.dwHighDateTime, edx
    invoke FileTimeToLocalFileTime, addr stUtcFileTime, addr stLocalFileTime
    invoke FileTimeToSystemTime, addr stLocalFileTime, lpstLocalTime

    ret
StampToLocalDateTime endp

LOCALE_SYSTEM_DEFAULT equ 0
g_szFmtDate db "yyyy-M-d", 0
printDate proc lpstDate: dword
    local buf[12]: byte
    invoke GetDateFormat, LOCALE_SYSTEM_DEFAULT, NULL,    lpstDate, offset g_szFmtDate, addr buf, sizeof buf
    m_InsTxt addr buf
    ret
printDate endp

;LOCALE_SYSTEM_DEFAULT equ 0
g_szFmtTime db "H:m:ss", 0
printTime proc lpstTime: dword
    local buf[9]: byte
    invoke GetTimeFormat, LOCALE_SYSTEM_DEFAULT, NULL, lpstTime, offset g_szFmtTime, addr buf, sizeof buf
    m_InsTxt addr buf
    ret
printTime endp

g_szFmtDateTime db "%d-%d-%d %d:%d:%d", 0
printDateTime proc lpstDateTime: DWORD
    local buf[30]: byte

    pusha
    mov edi, lpstDateTime
    movzx eax, (SYSTEMTIME ptr [edi]).wYear
    movzx ebx, (SYSTEMTIME ptr [edi]).wMonth
    movzx ecx, (SYSTEMTIME ptr [edi]).wDay
    movzx edx, (SYSTEMTIME ptr [edi]).wHour
    movzx esi, (SYSTEMTIME ptr [edi]).wMinute
    movzx edi, (SYSTEMTIME ptr [edi]).wSecond

    invoke wsprintf, addr buf, addr g_szFmtDateTime, eax, ebx, ecx,edx, esi, edi
    popa

    ret
printDateTime endp