Re: # Web Analytics Date format must be: YYYY-MM-DD, or 'today' or 'yesterday' or any keyword supported by the strtotime function (see http://php.net/strtotime for more information):

I did a "test installation" in another directory and ir work fine. If I install it in the old directory, using the same database, Will I lost my previous data?

At least, this should be ok as documented at [piwik.org]

Thanks a lot!