For me it turned out that the plugin Contact Form 7 – PayPal Add-on Version 1.3.4 was breaking the Datepicker functionality.

Disabling this plugin made Datepicker Version 2.6.0 with Contact Form 7 version 4.7 work as expected on WordPress 4.5.

Read more here: Datepicker is not working in contact form 7


Solution:

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