Snapshots of planned day - plan vs reality

No matter how detail oriented you are, all planning eventually meets reality and something needs to change in the schedule. What would be awesome is if I could take a snapshot when I have the plan ready, and then maybe do that throughout the day/week as changes need to take place.

With these snapshots it would be cool to see what changes I had to make, so that I might be able to identify some patterns like these type of tasks usually take longer, or around this time I behave like this and so on.