PIM-3531: allow DateFilters and DateValueSetter to handle \Datetime

| Q                    | A
| -------------------- | ---
| Bug fix?             | kinda
| New feature?         | N
| BC breaks?           | N
| CI currently passes? | N
| Tests pass?          | Y
| Scenarios pass?      | running
| Checkstyle issues?*  | -
| PMD issues?**        | -
| Changelog updated?   | -
| Fixed tickets        | -
| DB schema updated?   | -
| Migration script?    | -
| Doc PR               | -
@solivier plz rename to formatData(