Automatically closed - issue fixed for 2 weeks with no activity.
Configuration page for field of type Date doesn't preview options defined by Date module.
admin/config/content/diff/fields/datetime
As I can see, there is some typo in patch https://www.drupal.org/node/1350604 →
Variable $options_form should be changed into $form
Fixed
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Automatically closed - issue fixed for 2 weeks with no activity.