Problem with nginx-0.7.67 logs

[Xin Liu]

Hi all,

My server is Debian. And I installed nginx (0.7.67-1) to host my webpage.
The problem is that, everyday on 06:25PM (New York time), nginx will
generate a new log file and rename the old log file nginx.log.1.
I've checked server, there is no schedule job. And nobody restart nginx or
force nginx to generate a new log.
Anyone can help?
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