BrokerDST/BrokerDaylightSchedule.mq5

<EFBFBD><EFBFBD>//+------------------------------------------------------------------+
//|                                       BrokerDaylightSchedule.mq5 |
//|                                        Copyright <EFBFBD> 2018, Amr Ali |
//|                             https://www.mql5.com/en/users/amrali |
//+------------------------------------------------------------------+
#property copyright "Copyright <00> 2018, Amr Ali"
#property link      "https://www.mql5.com/en/users/amrali"
#property version   "1.400"
#property description "Script to determine whether your Broker follows the US, UK or AU daylight saving time (DST) schedule."

//+------------------------------------------------------------------+
//| Time functions                                                   |
//+------------------------------------------------------------------+
int TimeYear(const datetime t) {MqlDateTime st; TimeToStruct(t, st); return(st.year); }
int TimeHour(const datetime t) {MqlDateTime st; TimeToStruct(t, st); return(st.hour); }
//+------------------------------------------------------------------+
//| Return the date for the "Nth" Sunday for the iYear and iMonth.   |
//+------------------------------------------------------------------+
datetime GetNthSunday(int iYear, int iMonth, int Nth)
  {
// datetime dt=StringToTime((string)iYear+"."+(string)iMonth+".01"); // get date of first of month
   MqlDateTime st= {};
   st.year=iYear;
   st.mon=iMonth;
   st.day=1;
   datetime dt=StructToTime(st); // get date of first of month
   if(Nth<1)
      return(0);
   if(Nth>5)
      Nth=5;
   TimeToStruct(dt,st);
   int SundayDOM=(7-st.day_of_week)%7;  // 1st Sunday Day of Month
   dt+=(SundayDOM+7*(Nth-1))*86400;
   TimeToStruct(dt,st);
   if(st.mon!=iMonth)
      dt-=7*86400;
   return(dt);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
#define WEEKSECS (7*24*60*60)  // seconds in a week
//+------------------------------------------------------------------+
//| determine whether broker follows the US, UK or AU DST schedule   |
//+------------------------------------------------------------------+
int BrokerDaylightSchedule(void)
  {
   string symbol = Symbol();
//--- if the chart symbol is not forex or gold, then use EURUSD symbol.
   long CalcMode = SymbolInfoInteger(symbol,SYMBOL_TRADE_CALC_MODE);
   if(!(CalcMode == SYMBOL_CALC_MODE_FOREX || CalcMode == SYMBOL_CALC_MODE_FOREX_NO_LEVERAGE
        || StringSubstr(symbol,0,3) == "XAU" || StringSubstr(symbol,0,4) == "GOLD"))
     {
      symbol = "EURUSD";
      bool is_custom = false;
      if(!SymbolExist(symbol,is_custom))
         for(int i=0; i < SymbolsTotal(0); i++)
            if(StringFind(SymbolName(i,0),symbol) == 0)
              {
               symbol=SymbolName(i,0); // symbol may have suffix
               break;
              }
      SymbolSelect(symbol,true);
     }

   datetime lastbar = iTime(symbol, PERIOD_H1, 0);

   int iYear = TimeYear(lastbar);

   datetime dst_switch_au = GetNthSunday(iYear,4,1);  // the first Sunday of April for the AU switch
   datetime dst_switch_uk = GetNthSunday(iYear,3,5);  // the last Sunday of March for the UK switch
   datetime dst_switch_us = GetNthSunday(iYear,3,2);  // the second Sunday of March for the US switch

   if(lastbar < dst_switch_au + WEEKSECS)
     {
      iYear--;

      dst_switch_au = GetNthSunday(iYear,10,1);  // the first Sunday of October for the AU switch
      dst_switch_uk = GetNthSunday(iYear,10,5);  // the last Sunday of October for the UK switch
      dst_switch_us = GetNthSunday(iYear,11,1);  // the first Sunday of November for the US switch
     }

#define GETBAR(var, time)                                                       \
   var = iTime(symbol,PERIOD_H1, iBarShift(symbol,PERIOD_H1,(time),false));     \
   /* Print("bartime = ", var); */                                              \
   if(var == 0)                                                                 \
     {                                                                          \
      PrintFormat(">> error: history for '%s' is not available.", symbol);      \
      return(-1);                                                               \
     }

   datetime LastBarWk, LastBarPrevWk;

//--- compare bar times at the time of AU switch
   GETBAR(LastBarWk, dst_switch_au + WEEKSECS);
   GETBAR(LastBarPrevWk, dst_switch_au);
   if(TimeHour(LastBarWk) != TimeHour(LastBarPrevWk))  // server time changed at the time of AU switch
     {
      Print("DST_AU : server dst begins on the first Sunday of October (+1) and ends on the first Sunday of April (-1)");
      return(1);
     }
//--- compare bar times at the time of UK switch
   GETBAR(LastBarWk, dst_switch_uk + WEEKSECS);
   GETBAR(LastBarPrevWk, dst_switch_uk);
   if(TimeHour(LastBarWk) != TimeHour(LastBarPrevWk))  // server time changed at the time of UK switch
     {
      Print("DST_UK : server dst begins on the last Sunday of March (+1) and ends on the last Sunday of October (-1)");
      return(2);
     }
//--- compare bar times at the time of US switch
   GETBAR(LastBarWk, dst_switch_us + WEEKSECS);
   GETBAR(LastBarPrevWk, dst_switch_us);
   if(TimeHour(LastBarWk) == TimeHour(LastBarPrevWk))  // server time DID NOT change at the time of US switch
     {
      Print("DST_US : server dst begins on the second Sunday of March (+1) and ends on the first Sunday of November (-1)");
      return(3);
     }
//---
   Print("DST_NONE");
   return(0);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void OnStart()
  {
   Print("Server : ", AccountInfoString(ACCOUNT_SERVER));
   Print("Time   : ", TimeTradeServer());
   PrintFormat("Offset : GMT%+g", (TimeTradeServer() - TimeGMT()) / 3600.0);

   BrokerDaylightSchedule();
  }
//+------------------------------------------------------------------+

// sample output on different fx brokers

/*
 Server : ICMarketsSC-Demo
 Time   : 2024.03.30 02:36:09
 Offset : GMT+3
 DST_US : server dst begins on the second Sunday of March (+1) and ends on the first Sunday of November (-1)

 Server : Exness-MT5Trial
 Time   : 2024.03.29 23:37:05
 Offset : GMT+0
 DST_NONE

 Server : OctaFX-Demo
 Time   : 2024.03.30 01:37:14
 Offset : GMT+2
 DST_UK : server dst begins on the last Sunday of March (+1) and ends on the last Sunday of October (-1)

 Server : AdmiralsSC-Demo
 Time   : 2024.03.30 01:37:52
 Offset : GMT+2
 DST_UK : server dst begins on the last Sunday of March (+1) and ends on the last Sunday of October (-1)

 Server : RannForex-Server
 Time   : 2024.03.30 01:37:32
 Offset : GMT+2
 DST_UK : server dst begins on the last Sunday of March (+1) and ends on the last Sunday of October (-1)

 Server : XMGlobal-MT5 7
 Time   : 2024.03.30 02:48:16
 Offset : GMT+2
 DST_UK : server dst begins on the last Sunday of March (+1) and ends on the last Sunday of October (-1)

 Server : FxPro-MT5
 Time   : 2024.04.12 04:00:12
 Offset : GMT+3
 DST_UK : server dst begins on the last Sunday of March (+1) and ends on the last Sunday of October (-1)

 Server : FXOpen-MT5
 Time   : 2024.04.12 04:01:11
 Offset : GMT+3
 DST_US : server dst begins on the second Sunday of March (+1) and ends on the first Sunday of November (-1)

 Server : Tickmill-Demo
 Time   : 2024.04.12 04:02:13
 Offset : GMT+3
 DST_US : server dst begins on the second Sunday of March (+1) and ends on the first Sunday of November (-1)

 Server : Trading.comMarkets-MT5
 Time   : 2024.04.13 20:58:36
 Offset : GMT-4
 DST_US : server dst begins on the second Sunday of March (+1) and ends on the first Sunday of November (-1)
*/