Special Price From Date not working with Magento 1.9.2.4

[bjoern-quast]

Creating a rule that uses the Special Price From Date attribute doesn't work.
Ultimately, a UNIX-timestamp is compared to a string-representation of the date and thus returns a negative match.
Could this be a compatibility issue?
Is there a way around it?
I have a product that has the attribute "Special Price From Date" set to specific date (2016-05-30) and the rule like:
"attribute": "special_from_date", "operator": "==", "value": "2016-05-30"
or
"attribute": "special_from_date", "operator": "==", "value": "1464559200"
Am I doing it wrong?