Best Solution for Save Game complex State?

I have a game that I want to save some data which have this conditions.

think you have character and he works in a field corps to plant Corn. planting have a function which contains a field (GameObject) And the code for Planting Corn and Plant Name (exam "Corn")so after some time my game should plant a corn in Field corps by the character.if I want to save this state before the end time of planting function what should I do? I want to do function "A" by Character "B" on field "C" after time T. my save system should save all of this variables.