Your jail's date/time is set by the host environment. It sounds like you may just need to set the correct time zone within your jail -- use
tzsetup for that.
While you're at it, you may want to comment out the following line in /etc/crontab within the jail:
Code:
#1,31 0-5 * * * root adjkerntz -a
Otherwise you'll just get lots of warning emails about it within the jail.