Can you toggle the night vision IR on and off? Can you set the camera for "day" recording only?

You can change the night/day/auto setting in the app or as implied, let the camera determine when it needs to switch. D-Link Cameras with SD card storage can accomplish what you're proposing. But because this device doesn't have IFTTT the automation is very limited with only what comes in the box. There are D-Link motion sensors and other devices that do integrate with IFTTT and will give you more options. With the app your only options are to take a picture of the current frame, toggle auto/day/night, after setting up the device as a wifi one for remote viewing, you can view the local settings allowing you to modify the motion and sounds detection settings, notification settings and whether to automate.