For Trending graphs, if you set the resolution to 1-day, it will cause inconsistencies in the shading for certain time zones (of the same business hours).
It seems that this is "working as expected" rather than a defect (Case: 21796294), so I would like to post a enchancement request to make shading more consitent and useful for 1-day resolutions (or higher).
Some solutions are to have the shading disabled for such graphs, make it a less detailed shading, or have some third color for areas where there are both business and off hours.
Below is an image showing the difference for KL and the other US sites.
