The ‘date’ value of ‘oderby’ parameter does not sort your posts by the date specified into the metabox. It will sort the posts in context with the date when the post has been published.
If you need to sort by your date from a metabox (for custom fields) you can then use the Custom Field Parameters (http://codex.wordpress.org/Class_Reference/WP_Query#Custom_Field_Parameters)
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