Indoor LightingTimer

Anyone know of a timer that you can program to automatically increase the day length?
Can't find one anywhere. There must be such a thing, cause it could be so useful. You could induce blooming without a lot of effort and sync your seedlings to the day length outdoors easily.

I know I could reset it every week, but I don't want to have to do that. It doesn't seem like it would be that hard for someone to design an "increase by xxx minutes a week or day" feature into a timer.

Maybe the Intermatic DT27C would do what you want. It has an Astronomic Feature