Symfony form.vars.data vs form.vars.value

Question

A FormView object in Symfony contains several variables, that can be accessed via twig using the public vars property.

Two of those variables are

Answer 1

Take for example a DateType field.

Here, value would be something like the string 2016-06-10. data on the other hand would be a corresponding DateTime-Object.

When using Text fields, you will not see any difference because in both cases there will be just a string.