Hiya Frank, (plus those other enthusiasts of DD/MM/YYYY format...)
I wondered if you still use this same method for achieving your desired DD/MM/YYYY format... now we are here in 2019 with PM 3.6.x.
That helpful document and package that was done by John Ahern, was way back in 2012, so presumably shouldn't be used simply 'as is' now but maybe it's quite ok to simply retrofit the same changes to the current versions of the properties and javascript files involved...?
Or there is a totally new approach you use for this now...! ?
All Best!
Dan.