[Feature Request] Allow use of a keyboard shortcut (like arrow keys) to change dates

[FatOrangutan]

I think it would be easier to be able to use something like the left and right arrow keys to move to the previous and next dates, respectively.

[MrOtherGuy]

Cool idea, thanks! It's easy enough to do. I've landed a patch 70d1d62 that should enable this feature.