FormatDate process plugin

Problem/Motivation

If you import from CSV, XML, JSON (non-Drupal sources), it is fairly common to have dates formatted in lots of different ways. Let's provide a mechanism to format them to the required formats provided by Drupal.

Proposed resolution

Solution:

1. Ability to migrate a source in various date formats to a date field
2. Ability to migrate a source in various date formats to a date range field
3. Documentation on how to do these migrations on https://www.drupal.org/docs/8/api/migrate-api/migrate-process/migrate-pr... →

Remaining tasks

Reviews

User interface changes

API changes

Data model changes