The examples provided in the description of widget settings to limit the minimum and maximum date/time are incorrect.
In drupal.single_datetime.js: formatDate property is hardcoded to 'd.m.Y' and according to the documentation, the minDate and maxDate should be provided in the same format.
Assuming a standard Drupal installation, having this module installed (of course) and a field to store a date is attached to an entity. For example, a datetime having machine name field_date is attached to the page node type:
/admin/structure/types/manage/page/form-display.field_date field.+1970/01/02 as the value for the limit to set the minimum (or maximum) allowed date./node/add/page.+02.01.1970 as the value to limit the minimum (or maximum) allowed date./node/add/page.Change the description of the minimum and maximum date/time widget setting elements to: "Examples: '0' for now, '+02.01.1970' for tomorrow, '12:00' for time, '13:45:34',formatTime:'H:i:s'. More info".
The examples provided in the description of widget settings correctly explain how to configure the minimum and maximum date/time limits properly.
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Needs review
2.0
Code
I've opened a merge request with the proposed changes. Although a simple change, hopefully, it can save people some time figuring out why the provided original examples are not working as expected.