can you add an option to control the time zone in the site? like in 3.4 (today, yesterday, etc..)

It's automatic, so there is no need for it. 

 

there is, because in some languages there are some problems with the translation if it numbers like 18/04/15 or 18 Feb 2015 -  it makes a diffrent, i don't understand why not give us a chance to change it, i mean- we could do this from 1.0 to 3.4, why all of a sudden change that?

I believe you are talking about locales and languages, not time zones right? 

yes, i think so.