Calendar date picker, a simple WordPress plugin that does one thing. It adds the jQuery UI Datepicker plugin to the edit screen.
When you click the published edit button in the Publish metabox a new drop down will appear. By default you will see a select field and a few input fields for the month, date, year etc.

Calendar Date Picker adds a new input field above these other fields and when clicked on will show an overlay calendar with a Timepicker extension. When the values are changed each field is updated accordingly!
Alternatively you can directly click on each field and a modified overlay calendar will appear.
I hope you never have incorrect future publish dates again.
Thanks to Aaron Hockley for the idea.
WordPress folks: recommendation for a calendar date-picker to be used for post scheduling? Plugin?
— Aaron Hockley (@ahockley) November 18, 2012
Screenshots

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