Filter Cel results in certain intervals

Filter Cel results in certain intervals

Hi guys, I'm working on a project, I'm measuring two values, and I need to print them at 8am, 4pm and 12 o'clock every day.
How can I set up the filter for this task? :confused:
Urgent! :)

This is a migrated post! Originally posted on 28.03.2011 by user bojan. Please be aware that information can be outdated.