Originally Posted by: mohamedmostfa

How to use in the expert the difference between two dates 
Example I have 4-14-2003 and 3-21-2003

How do I write the dates 3-21-2003 and 4-14-2003 in the expert as an equation?

Hello,

I might need a bit more detail on the intended use, but generally speaking there are date/time functions that can be used to reference dates. These would be:

DayOfWeek()

DayOfMonth()

Month()

Year()

Hour()

Minute()

There are likely a few ways you could calculate a difference, although this would be based on a number of bars between the dates as opposed to a Calendar based day count.

A simple way would be to use the BarsSince() function along with identifying the date. Do this for both dates, then subtract the difference between the two values.

For example:

X1:=Month()=4;
X2:=DayOfMonth()=14;
X3:=Year()=2003;
Y1:=Month()=3;
Y2:=DayOfMonth()=21;
Y3:=Year()=2003;
BarsSince(Y1 AND Y2 AND Y3) - BarsSince(X1 AND X2 AND X3);

Originally Posted by: mohamedmostfa

Thank you 
I need an expert, not an indicator

Hello again,

There are several components to an Expert, but if you are wanting something to display in the Commentary area, then you would need to use the WriteVal() function. For example:

The number of bars between 3/21/2003 and 4/14/2003 is WriteVal(BarsSince(Month()=3 AND DayOfMonth()=21 AND Year()=2003) - BarsSince(Month()=4 AND DayOfMonth()=14 AND Year()=2003))