This release has a number of bug fixes and enhancements.
Limited field validation is now enforced.
1) If the field is marked as required, then you will get a validation error if there are no items with any values
#1536344: The required option doesn't work
2) Minimum component mix has been added. This allows you to select what components are required to make a partial date valid. For example, you can specify that the From and To years are required. During validation, a field that is not empty is then checked against these.
#1536348: Allow individual date parts to be required
An approximate component has been added
This adds a checkbox (if enabled) that allows users to mark the date as approximate.
A corresponding formatter option has been added that only shows if the date is flagged as approximate. This is applied to both from and to dates in the case of ranged date fields.
Inline ranged theming is now optional
This required overriding the core theme_form_element() [only for this widget], and rendering the date components in this. This is a configurable setting in the instance settings.
#1353400: Provide inline option for date widgets
Remove checkbox is now optional