Steps to reproduce

• Add a field "Date" (ezdate) to the Blog Post Content Type
• Create a new Content Item using Blog Post
• Select a date (d) in this new field using the datepicker
• Publish the object
• In the content view, the date displayed is d-1
• If you edit the Content Item, the date field shows d-1

Important note:

it seems that this issue affects only the ezdate and not ezdatetime fieldtype.