JC is:
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=33881&start=0

@test
This does not work for me. I have set in the profile the timezone to NY and entered date of 04-07-1991 in admin backend. It shows in front indeed 03-07-1991
After patching this with the proposed solution i changed in admin backend date to 06-07-1991 and in frontend it still shows one day behind i.e.05-07-1991

Leo

There is not really support for filter="none". You either have to use filter="server_utc" or filter="user_utc". The user one is the default.
The thing is that Joomla always stores the date and times as UTC in the database. And calculates it back to the requested timezone when showing the data, giving localised date/time to the user.
In case of a birthdate this of course doesn't make much sense. There you should use the "server_utc" filter which means it's stored and shown based on the server timezone as set in the global configuration. Not changing depending on user settings.

However the problem in this case isn't the filter. It's the fact that the date is stored as date only without the time. When Joomla changes it to UTC it changes the time part according to timezone. But that part is thrown away by the plugin when it saves the date. This isn't a problem as long as you are in Europe, but it is a problem in America due to the nature of the timezones

Thus filter="none" may work in the backend as kind of an unsupported hack, but it fails again in each other instance where the date will be shown. Because there Joomla still applies the timezone.
We better fix it by saving the whole datetime instead of only the date.

I understand what you write but I am not capable to make the changes as you know probably. I do test so as soon this is patched I will test again..... (back in my cage ;-) )

The comment was more targeted at @ron4mac

Can the PR be updated with the proposed change, so we can test it? Thanks.

I have created a new PR (#3910) that handles the storing of datetime of the DOB and set the filter to server_utc.

@test Roland I have set to NY server time, birthdate 2nd July and in editing it shows 1 july for birthday..... I have changed the 2 files with the patch and I still have the 1 July

Closing as #3910 works fine