KDE Plasma Date & Time Format

[Jimmy Johnson <field.engineer@gmail.com>]

In KDE4 I use the long date with the short day: "Mon, September 19, 2017".
Is there an easy way to do this in Plasma5?  Even better would be long 
date with short day and short month: "Mon, Sep 19, 2017"  Is there a 
config file I can edit?  I have spent my day looking at locals, etc 
until I have a headache and have made no headway with this at all.

Thanks,
--
Jimmy Johnson

Debian Stretch - KDE Plasma 5.8.6 - AMD A8-7600 - EXT4 at sda6
Registered Linux User #380263