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/*
* Modification History
*
* 2001-November-7 Jason Rohrer
* Created.
*
* 2002-April-11 Jason Rohrer
* Added missing include, and fixed a bug.
*
* 2004-January-29 Jason Rohrer
* Fixed so that 0-point of time is the same as on other platforms.
*
* 2004-October-14 Jason Rohrer
* Fixed bug in second/millisecond callibration.
* Fixed bug in win32 time to ANSI time translation.
* Fixed daylight savings time bug.
*/
#include "minorGems/system/Time.h"
#include <windows.h>
#include <winbase.h>
#include <time.h>
#include <stdio.h>
/**
* Windows implementation of Time.h.
*
* The 0-point should match the ANSI standard.
*/
void Time::getCurrentTime( unsigned long *outSeconds,
unsigned long *outMilliseconds ) {
// convert from win32 broken-down time (which has msec resolution)
// to an ANSI time struct and then convert to an absolute time in
// seconds
// This procedure ensures that the 0-point matches the ANSI standard.
// note:
// we cannot simply call ANSI time() to get the seconds and then rely
// on GetLocalTime to get the milliseconds, since the seconds value
// used by GetLocalTime is (strangely enough) not calibrated to the seconds
// value of time().
// In other words, it is possible for the time() seconds to advance
// at a different clock cycle than the GetLocalTime seconds.
// get time using a win32 call
SYSTEMTIME win32TimeStruct;
GetLocalTime( &win32TimeStruct );
// convert this win32 structure to the ANSI standard structure
struct tm ansiTimeStruct;
ansiTimeStruct.tm_sec = win32TimeStruct.wSecond;
ansiTimeStruct.tm_min = win32TimeStruct.wMinute;
ansiTimeStruct.tm_hour = win32TimeStruct.wHour;
ansiTimeStruct.tm_mday = win32TimeStruct.wDay;
// ANSI time struct has month in range [0..11]
ansiTimeStruct.tm_mon = win32TimeStruct.wMonth - 1;
// ANSI time struct has year that is an offset from 1900
ansiTimeStruct.tm_year = win32TimeStruct.wYear - 1900;
// unknown daylight savings time (dst) status
// if we fail to init this value, we can get inconsistent results
ansiTimeStruct.tm_isdst = -1;
unsigned long secondsSinceEpoch = mktime( &ansiTimeStruct );
*outSeconds = secondsSinceEpoch;
*outMilliseconds = (unsigned long)( win32TimeStruct.wMilliseconds );
}
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