[squid-users] oot: about sarg

i use crontab
*/30 * * * * /usr/bin/sarg -f /etc/squid/sarg.conf

but the sarg always display 2 lines
16Jan2009-16Jan2009 Fri Jan 16 07:30:01 EST 2009 7 82.28M 11.75M
15Jan2009-16Jan2009 Fri Jan 16 06:30:12 EST 2009 98 3.44G 35.13M
15Jan2009-15Jan2009 Fri Jan 16 00:00:12 EST 2009 98 3.44G 35.12M

how to fix it ?
the point 15Jan2009-16Jan2009 is similar with 15Jan2009-15Jan2009

i want to set my report
everyday with update every 30 min...

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