impact_probe.cron

0 0 * * * php /your/path/to/ImpactProbe/index.php --uri=gather/index/daily
0 0,12 * * * php /your/path/to/ImpactProbe/index.php --uri=gather/index/twice_daily
0 0 * * 0 php /your/path/to/ImpactProbe/index.php --uri=gather/index/weekly
0 0 * * 0,4 php /your/path/to/ImpactProbe/index.php --uri=gather/index/twice_weekly
0 * 1 * * php /your/path/to/ImpactProbe/index.php --uri=gather/index/monthly
0 * 1,15 * * php /your/path/to/ImpactProbe/index.php --uri=gather/index/twice_monthly