You can sent the timer to lets say 4-7am for it to kick in.
Oh I get it. You want to start charging at 4am and stop by 7am so that you are more likley to pull it off the charger when it's full.
I assume this is to start using the phone before it enters the float charging mode.
I like the idea of a delayed beginning, but I see no need to stop charging at 7am. Either way, assuming the battery gets full at exactly 7am, turning the charger off, and leaving it on will have the same effect. The phone will start using the battery. However, if you leave the outlet on, you have a chance to top the battery back off during the float period...you would lose this if the timer turned the outlet off.
Another point to consider is that it may not take 3 hours to charge. What if it's full after 2 hours? You will be in the float zone for an hour. And if the charger is off, it can't fill back up.
My last comment regarding this:
In standby mode with WiFi on, I only use 1% per hour of my battery. So it seems to me that going into floating power mode for an hour would only use 1% of my battery. Furthermore, it would take 10 hours of charging all in float mode to experience the types of battery drops that people are talking about. How concrete is the evidence that floating charge is responsible for a 15% drop within the first few minutes of use?