Help to set time point
Please help to set time points:
I want to set a time point that's sometime before a given time, for example:
TodayDatetime=2009.07.09 0:00, to calculate a time point that's two weeks earlier:
TwoWeeksDatetime=TodayDatetime - 2*7*24, time unit in hour, the problem is how to make this work?
Thanks,
Jean
TwoWeeksDatetime=TodayDatetime-2*7*24*3600 ; it's simple integer operation
Then display on chart using a VLINE object.
Please help to set time points:
I want to set a time point that's sometime before a given time, for example:
TodayDatetime=2009.07.09 0:00, to calculate a time point that's two weeks earlier:
TwoWeeksDatetime=TodayDatetime - 2*7*24, time unit in hour, the problem is how to make this work?
Thanks,
Jean
TwoWeeksDatetime=TodayDatetime-2*7*24*3600 ; it's simple integer operation
Then display on chart using a VLINE object.
Yes? I doubt that'll work, I just want to set that exact time point in hour. I want to count hourly bar from that point
Yes? I doubt that'll work, I just want to set that exact time point in hour. I want to count hourly bar from that point
Thanks, I'll try 1st to set the time point then the bars.
TwoWeeksDatetime=TodayDatetime-2*7*24*3600 ; it's simple integer operation
Then display on chart using a VLINE object.
No, it dosen't work this way, one is string, the other is numeric, cannot put them in an operation,
Who has the solution? Help please!
No no no, you got it all wrong. A datetime is integer. Even if you define it string-like, it's integer.
For example, if you have this:
int init()
{
datetime test=D'2004.01.01 00:00';
Print(test);
}
Will display an integer value; because the compiler knows that the D'...' notation refers a datetime constant and not a string. If it would be string, it would be
string datetime="2004.01.01 00:00";
And this is a pure string. That's why strings are quote-separated and datetimes are apostrophe-separated.
If you want to pinpoint specific hours in your charts, that's a bit different from what you do. Paste this bunch of functions in your project and use them wisely:
bool Between(double v,double a,double b) { double aa; double bb; bool res; aa=MathMin(a,b); bb=MathMax(a,b); if (v>=a&&v<=b) res=True; else res=False; return(res); } //*************************************************************** // Date & Time functions //*************************************************************** bool LeapYear(int year) { double d,d2; d=(year-1988)/4.0; d2=Round(d)*1.0; if (d==d2) return(true); else return(false); } int MaxDay(int m,int y) { switch(m) { case 1: return(31); case 2: if (LeapYear(y)==True) return(29); else return(28); case 3: return(31); case 4: return(30); case 5: return(31); case 6: return(30); case 7: return(31); case 8: return(31); case 9: return(30); case 10: return(31); case 11: return(30); case 12: return(31); default: return(0); } } bool DateExists(int d,int m,int y) { if (Between(m,1,12)==false) return(false); if (Between(m,1,MaxDay(m,y))==false) return(false); else return(true); } int DayFrom1Jan1970(int d,int m,int y) { int counter=0; int cntyears=0; int cntmths=0; int j; if (y>=1970) //going up { cntyears=y-1970; if (cntyears>0) { for (j=0;j<cntyears;j++) { if (LeapYear(1970+j)==false) counter=counter+365; else counter=counter+366; } } cntmths=m-1; if (cntmths>0) { for (j=0;j<cntmths;j++) counter=counter+MaxDay(j+1,y); } counter=counter+d-1; } else //if (y>=1970) //going down { cntyears=1970-y; if (cntyears>0) { for (j=0;j<cntyears;j++) { if (LeapYear(1970-j)==false) counter=counter-365; else counter=counter-366; } } cntmths=12-m; if (cntmths>0) { for (j=0;j<cntmths;j++) counter=counter-MaxDay(12-j,y); } counter=counter - (MaxDay(m,y)-m+1); } return(counter); } datetime TimeAtNoon(int d,int m,int y) { int p=DayFrom1Jan1970(d,m,y); return( 12*3600 + p*24*3600 ); } int DateDiff(int d1,int m1,int y1,int d2,int m2,int y2) { int p1=DayFrom1Jan1970(d1,m1,y1); int p2=DayFrom1Jan1970(d2,m2,y2); return(p1-p2); } datetime MoveDate(int d1,int m1,int y1,int daystomove,int &d2,int &m2, int &y2) { datetime timeafter=TimeAtNoon(d1,m1,y1)+daystomove*24*3600; d2=TimeDay(timeafter); m2=TimeMonth(timeafter); y2=TimeYear(timeafter); return(timeafter); }
No no no, you got it all wrong. A datetime is integer. Even if you define it string-like, it's integer.
For example, if you have this:
int init()
{
datetime test=D'2004.01.01 00:00';
Print(test);
}
Will display an integer value; because the compiler knows that the D'...' notation refers a datetime constant and not a string. If it would be string, it would be
string datetime="2004.01.01 00:00";
And this is a pure string. That's why strings are quote-separated and datetimes are apostrophe-separated.
If you want to pinpoint specific hours in your charts, that's a bit different from what you do. Paste this bunch of functions in your project and use them wisely:
That's great, thanks a lot, I'll try to understand and follow.
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Please help to set time points:
I want to set a time point that's sometime before a given time, for example:
TodayDatetime=2009.07.09 0:00, to calculate a time point that's two weeks earlier:
TwoWeeksDatetime=TodayDatetime - 2*7*24, time unit in hour, the problem is how to make this work?
Thanks,
Jean