When trying to get the custom time range for PNP4Nagios graphs, it might result in an error "application/models/data.php [664]:". It can easily resolved by editing "system.php"  in PNP4Nagios controllers folder. To start with first make a backup of the file.

# cp -a /usr/local/pnp4nagios/share/application/controllers/system.php /usr/local/pnp4nagios/share/application/controllers/system.php.bkp
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