Cannot create Customer with Date of Birth in Magento 2.1 (en_GB locale)

[JacobDrummond]

Environment

1. Apache 2.4.17
2. MySQL 5.0.11-dev
3. PHP 5.6.15
4. Magento 2.1.0

Steps to reproduce

1. In System > All Users > User > [You], set the interface locale to English (United Kingdom):
   
2. Create a new customer. Make sure to fill in Date of Birth field:
   
3. Save Customer

Expected result

1. Customer saves without error

Actual result

1. "Invalid date" exception thrown:
   
2. Trying to save the new customer again results in a JS validation error:
   

Cause

• The culprit is Date::inputFilter()
• In my case, Date::inputFilter() accepts 08/24/2016 and returns 0,8/2,4/2,016
• 0,8/2,4/2,016 is not a real date in any locale, causing an exception to be thrown.

General locale issues in Magento 2.1

• Changing admin locale from en_US to en_GB causes PHP date formats to change, but not JS date formats.
• In the above example, the JS datepicker populated the field with 08/24/2016, despite the entire UI being in en_GB.

[sevos1984]

Internal ticket created MAGETWO-57835, thanks for reportng

[slavvka]

The issue has been fixed and delivered to develop.