The original, downloaded version of Google Earth shows the month (and has already had a historical imagery feature for the long time). Get "Google Earth Pro" (i

The original, downloaded version of Google Earth shows the month (and has already had a historical imagery feature for the long time). Get "Google Earth Pro" (it's still free, that's just what they call it now), go to View->Historical Imagery, and you can scrub left and right on the slider.