We have some date fields in our metabox and just realised it is possible to enter and save random numbers in the field. Is there some built-in way to enable validation and disallow the entry of dates in the wrong format?
Here's how we are defining one of the affected date fields.
'id' => 'availability_start',
'type' => 'date',
'name' => 'Available From',
'desc' => 'Will be available starting on this date.',