Emulating onChange function signature of other material-ui components

[rphumulock]

It would be nice if the onChangeHandler had the the same function definition as other material-ui components ie onChange(evt){
console.log(evt.target.value) // date
}

[dmtrKovalenko]

Picker is a bit complex’s control. onChange can be fired from a lot of pickers parts. Thus we cannot provide an event of changing date.