计算GMT偏差时间
#include <WinUser32.mqh>#import "Kernel32.dll"
int GetTimeZoneInformation(int &TIME_ZONE_INFORMATION[]);
void GetSystemTime(int &SYSTEMTIME[]);
#import
//------ Get GMT Offset by GetTimeZoneInformation() - modified from CrapperQuotes source ------//
int GMT_Off_GetTimeZoneInformation()//20
{
int a,offlocmin,n;
n=TimeCurrent()-TimeLocal(); // server time - local time, in seconds
switch(GetTimeZoneInformation(a))
{
case 0: // no daylight saving in local time zone, or unkown
offlocmin=a;
break;
case 1: // local system is operating in standard time (no daylight saving time)
offlocmin=a;
break;
case 2: // local system is operating in daylight saving time
offlocmin=a+a;
break;
}
return(MathRound(n/3600.0-offlocmin/60.0));
}
//------ Get GMT Offset by GetSystemTime() - unknown source ------//
int GMT_Off_GetSystemTime()//10
{
double GMT_Diff;
int SYSTEMTIME;
int nYear,nMonth,nDay,nHour,nMin,nSec,nMilliSec;
string sMonth,sDay,sHour,sMin,sSec;
string sUTC_Time;
GetSystemTime(SYSTEMTIME);//API
nYear = SYSTEMTIME&0x0000FFFF;
nMonth = SYSTEMTIME>>16;
nDay = SYSTEMTIME>>16;
nHour = SYSTEMTIME&0x0000FFFF;
nMin = SYSTEMTIME>>16;
nSec = SYSTEMTIME&0x0000FFFF;
nMilliSec = SYSTEMTIME>>16;
sMonth = 100 + nMonth;
sMonth = StringSubstr(sMonth, 1);
sDay = 100 + nDay;
sDay = StringSubstr(sDay, 1);
sHour= 100 + nHour;
sHour= StringSubstr(sHour, 1);
sMin = 100 + nMin;
sMin = StringSubstr(sMin, 1);
sSec = 100 + nSec;
sSec = StringSubstr(sSec, 1);
sUTC_Time=StringConcatenate(nYear,".",sMonth,".",sDay," ",sHour,":",sMin,":",sSec);
GMT_Diff=TimeCurrent()-StrToTime(sUTC_Time);
return(MathRound(GMT_Diff / 3600.0));
}
// Get GMT Offset in several possible ways
int GetGMT_Offset()
{
bool IsPlausible1=false,IsPlausible2=false,IsIdentical=false;
int GMT_Offset1,GMT_Offset2;
GMT_Offset1 = GMT_Off_GetSystemTime(); //10
GMT_Offset2 = GMT_Off_GetTimeZoneInformation(); //20
if(-12<=GMT_Offset1 && GMT_Offset1<=12)
IsPlausible1=true;
if(-12<=GMT_Offset2 && GMT_Offset2<=12)
IsPlausible2=true;
if(GMT_Offset1==GMT_Offset2)
IsIdentical=true;
if(IsIdentical && IsPlausible1)
{
ERR_GMT_Offset=0;
return(GMT_Offset1);
}
ERR_GMT_Offset++; // if not identical or not plausible, then increase error counter and return most suitable value
if(IsPlausible1 && !IsPlausible2)
return(GMT_Offset1);
else if(!IsPlausible1 && IsPlausible2)
return(GMT_Offset2);
else // leave unchanged
return(GMT_Offset);
}
好帖，来顶下
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