Shading specific time periods on a graph is possible using NetMRG. Typically this is used for highlighting the workday or SLA distinctions based on time of day. The following steps will walk you through the setup of workday highlighting on a graph.
Add a new Graph Item.
Select Show Advanced.
Leave the title of the item blank if you want it to be omitted on the legend, otherwise enter a label such as "Business Hours."
Set the Item Type to Area.
Select a color for the highlighting.
Select Fixed Value in the Monitor drop-down.
Type in "INF" as the fixed value. This allows the graph item to take on an infinite height, which is rendered by filling the background.
Unselect all checkboxes under Legend.
Enter start and stop times in their respective text boxes. Times should be prefixed with a plus sign ('+') and be consistent with GNU Date Input Formats. An example would be +9am for a start time and +5pm for an end time, to highlight the "typical" business day.
Click Save Changes and observe the colored rectangle cover a lot of the data on your graph.
Click Move Up beside your new graph item until it reaches the top of the list. You now have a graph with workday highlighting!