Financer - Date and time internationalization

Need to implement a way to work with date and time in a way internationalized way.

There are two modes, input and output.
The output mode is to show date on user interface and the output mode to store in the database.

The output mode to store in the database is based on ISO 8601: YYYY-MM-DD

For the input mode there are predefined supported formats based by region/country:

• MM/DD/YYYY: Used on United States.
• DD/MM/YYYY: Used on Brazil.

Other formats for output will be added.