Date/Time structures to php DateTime

[stefanak-michal]

Is your feature request related to a problem? Please describe.
For Date/Time structures add method which will return php DateTime class instance.

Describe the solution you'd like
For specific bolt structures I want to consider adding this specific method, something like toDateTime().

Describe alternatives you've considered
You can do it by yourself by accessing structure class properties, or casting as string and parsing as you need, but this can be nice feature.