计算GMT偏差时间

1. #include <WinUser32.mqh>
   
2. 
   
3. #import "Kernel32.dll"
   
4. int GetTimeZoneInformation(int &TIME_ZONE_INFORMATION[]);
   
5. void GetSystemTime(int &SYSTEMTIME[]);
   
6. #import
   
7. 
   
8. //------ Get GMT Offset by GetTimeZoneInformation() - modified from CrapperQuotes source ------//
   
9. int GMT_Off_GetTimeZoneInformation()//20
   
10.   {
    
11.    int a[43],offlocmin,n;
    
12. 
    
13.    n=TimeCurrent()-TimeLocal(); // server time - local time, in seconds
    
14. 
    
15.    switch(GetTimeZoneInformation(a))
    
16.      {
    
17.       case 0: // no daylight saving in local time zone, or unkown
    
18.          offlocmin=a[0];
    
19.          break;
    
20.       case 1: // local system is operating in standard time (no daylight saving time)
    
21.          offlocmin=a[0];
    
22.          break;
    
23.       case 2: // local system is operating in daylight saving time
    
24.          offlocmin=a[0]+a[42];
    
25.          break;
    
26.      }
    
27. 
    
28.    return(MathRound(n/3600.0-offlocmin/60.0));
    
29.   }
    
30. //------ Get GMT Offset by GetSystemTime() - unknown source ------//
    
31. int GMT_Off_GetSystemTime()//10
    
32.   {
    
33.    double GMT_Diff;
    
34.    int SYSTEMTIME[4];
    
35.    int nYear,nMonth,nDay,nHour,nMin,nSec,nMilliSec;
    
36.    string sMonth,sDay,sHour,sMin,sSec;
    
37.    string sUTC_Time;
    
38. 
    
39.    GetSystemTime(SYSTEMTIME);//API
    
40.    nYear     = SYSTEMTIME[0]&0x0000FFFF;
    
41.    nMonth    = SYSTEMTIME[0]>>16;
    
42.    nDay      = SYSTEMTIME[1]>>16;
    
43.    nHour     = SYSTEMTIME[2]&0x0000FFFF;
    
44.    nMin      = SYSTEMTIME[2]>>16;
    
45.    nSec      = SYSTEMTIME[3]&0x0000FFFF;
    
46.    nMilliSec = SYSTEMTIME[3]>>16;
    
47. 
    
48.    sMonth = 100 + nMonth;
    
49.    sMonth = StringSubstr(sMonth, 1);
    
50.    sDay   = 100 + nDay;
    
51.    sDay   = StringSubstr(sDay, 1);
    
52.    sHour  = 100 + nHour;
    
53.    sHour  = StringSubstr(sHour, 1);
    
54.    sMin   = 100 + nMin;
    
55.    sMin   = StringSubstr(sMin, 1);
    
56.    sSec   = 100 + nSec;
    
57.    sSec   = StringSubstr(sSec, 1);
    
58. 
    
59.    sUTC_Time=StringConcatenate(nYear,".",sMonth,".",sDay," ",sHour,":",sMin,":",sSec);
    
60. 
    
61.    GMT_Diff=TimeCurrent()-StrToTime(sUTC_Time);
    
62. 
    
63.    return(MathRound(GMT_Diff / 3600.0));
    
64.   }
    
65.   
    
66. // Get GMT Offset in several possible ways
    
67. int GetGMT_Offset()
    
68.   {
    
69.    bool IsPlausible1=false,IsPlausible2=false,IsIdentical=false;
    
70.    int GMT_Offset1,GMT_Offset2;
    
71. 
    
72.    GMT_Offset1 = GMT_Off_GetSystemTime();                        //10
    
73.    GMT_Offset2 = GMT_Off_GetTimeZoneInformation();               //20
    
74. 
    
75.    if(-12<=GMT_Offset1 && GMT_Offset1<=12)
    
76.       IsPlausible1=true;
    
77.    if(-12<=GMT_Offset2 && GMT_Offset2<=12)
    
78.       IsPlausible2=true;
    
79.    if(GMT_Offset1==GMT_Offset2)
    
80.       IsIdentical=true;
    
81. 
    
82.    if(IsIdentical && IsPlausible1)
    
83.      {
    
84.       ERR_GMT_Offset=0;
    
85.       return(GMT_Offset1);
    
86.      }
    
87. 
    
88.    ERR_GMT_Offset++; // if not identical or not plausible, then increase error counter and return most suitable value
    
89. 
    
90.    if(IsPlausible1 && !IsPlausible2)
    
91.       return(GMT_Offset1);
    
92.    else if(!IsPlausible1 && IsPlausible2)
    
93.       return(GMT_Offset2);
    
94.    else // leave unchanged
    
95.    return(GMT_Offset);
    
96.   }

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好帖，来顶下