Please describe the problem:
Hi, I can't seem to create the correct birthdate for any contact born before 1969.

Steps to reproduce:
1. Create a contact
2. Attempt to insert a birthday before 1969 in the "Personal Information" tab of the contact editor


Actual results:
The date will revert to 20** instead of 19** for example: 1967 will convert itself to 2067 (not a sane birthday, unless you are a very good family planner!)

Expected results:
A birthday _before_ 1969 should be possible.

Does this happen every time?
Yes

Other information:
It has been suggested on the Dropline forum that this is connected with the unix epoch (ref. http://forums.droplinegnome.org/viewtopic.php?p=33844#33844 )