原因：修改系统时间后，未重启rsyslog
service rsyslog restart
service crond restart
#檢查
Mar 19 23:31:18 mysql-import crond[32047]: (CRON) INFO (Shutting down)
Mar 19 23:31:18 mysql-import crond[32114]: (CRON) INFO (Syslog will be used instead of sendmail.)
Mar 19 23:31:18 mysql-import crond[32114]: (CRON) INFO (RANDOM_DELAY will be scaled with factor 32% if used.)
Mar 19 23:31:18 mysql-import crond[32114]: (CRON) INFO (running with inotify support)
Mar 19 23:31:18 mysql-import crond[32114]: (CRON) INFO (@reboot jobs will be run at computer's startup.)
Mar 20 11:31:34 mysql-import crond[32114]: (CRON) INFO (Shutting down)
Mar 20 11:31:34 mysql-import crond[32154]: (CRON) INFO (Syslog will be used instead of sendmail.)
Mar 20 11:31:34 mysql-import crond[32154]: (CRON) INFO (RANDOM_DELAY will be scaled with factor 74% if used.)
Mar 20 11:31:34 mysql-import crond[32154]: (CRON) INFO (running with inotify support)
Mar 20 11:31:34 mysql-import crond[32154]: (CRON) INFO (@reboot jobs will be run at computer's startup.)