I'm currently working on a plugin which enables the display of business hours on the Cacti/RRD Charts.
I also opened a feature request for it, though it may end up being a plugin, as it should support all existing Cacti 1.x versions (prettty simple code)
https://github.com/Cacti/cacti/issues/4874
I've attached some demo graphs from my early development version.
- BusinesHours_demo_plugin_2.png (83.8 KiB) Viewed 5875 times
- BusinesHours_demo_plugin_1.png (80.2 KiB) Viewed 5875 times