calendar.app

Calendar is not able to read some dates correctly.
I have attached a screendump showing the Contacts entry for a birthday on 18 January, a correct date display in BusyCal and Calendar showing the incorrect date.
I believe its a bug.

Further to my post, I believe this is a bug, but since I'm not a developer, I can't post it to Apple. Can I ask the forum moderator, or perhaps a developer, to review my data and if they agree that the fault is neither user nor hardware, escalate the matter to a bug and submit it to Apple. Thanks