I've piece of code, that isn't working(expert advisor hangs) when period = Period.Monthly:

 Calendar from = Calendar.getInstance();   
        from.setTimeZone(TimeZone.getTimeZone("GMT"));
        from.setTimeInMillis (time);
        if ( period == Period.DAILY )
            from.roll(Calendar.DAY_OF_YEAR, -1);     
        else if ( period == Period.WEEKLY )
            from.roll(Calendar.DAY_OF_YEAR, -7); 
        else if ( period == Period.MONTHLY )
            from.roll(Calendar.DAY_OF_YEAR, -30); 
        Calendar to = Calendar.getInstance();
        to.setTimeZone(TimeZone.getTimeZone("GMT"));
        to.setTimeInMillis (time);               
        
        java.util.List<IOrder> orders = this.context.getHistory().getOrdersHistory(this.instrument, from.getTimeInMillis(), to.getTimeInMillis());

When I'm using the:

else if ( period == Period.MONTHLY )
            from.roll(Calendar.DAY_OF_YEAR, -15); 

The expert adsvisor is works, but I'm really need the orders history for the last month(not half month).

Please consider this report and help me to solve the problem.