SRG - How to configure daily reports

[tomputer]

Hello
I installed srg on my pfsense. Everything work's fine, but I am looking for solution how to configure daily reports view.
In default configuration sgr reports are showing date range from first to last logging day  eg```
Select a time period to view reports for: 2011Mar24-2011Mar28)

I found some description how to do it on http://www.i-synapse.it/products/opensource/sarg-reports/download/sarg-reports
but when I try to run this shell script there are errors:

: not found
: not found
date: illegal option -- -
usage: date [-jnu] [-d dst] [-r seconds] [-t west] [-v[+|-]val[ymwdHMS]] ...
            [-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]
: not found
: not found

On the fully sarg version for freeBSD it was very simple , But on srg i can find that option.

Thanks for help and sorry for my english.