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MQL4 Reference  Trading functions  OrderOpenTime

 
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datetime OrderOpenTime( )
Returns open time for the currently selected order.
Note: The order must be previously selected by the OrderSelect() function.
Sample:
  if(OrderSelect(10, SELECT_BY_POS)==true)
    Print("open time for the order 10 ",OrderOpenTime());
  else
    Print("OrderSelect returned error of ",GetLastError());