After upgrading to Debian 8 to 9 when I try and view a websites data I get the error
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):
The system also thinks it there is no data tracked although I can see data being logged.
Thanks for the pointer but in this case was not the issue. However we were using the Shibboleth Auth plugin which was the issue. Suspect it is not compatible with the latest Matomo or needed extra configuration perhap related to returning a date_registered value. Not a problem for us as I have moved over to the official LDAP plugin.