Help!!! Newbie needs a hand

 
Hi,

My girlfriends and I are trying to code our first EA and we wanted to know about using diiferent time period data; we read on some forums that it's a good thing to do.
We know about the Timeseries access functions but we had a few questions:

1. Why would you do this?
2. Some examples of this being done.

Ciao,

Toni
 
This sounds very interesting. Any comments from the experts out there?

Ms P
 
Does anyone have any example code for this?
Reason: