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If i import contacts from Thunderbird, birthday date is not imported corectly.
After import i open the contact, is see only the birthday year. month and day are only see, if type the left cursor in this feld.
I use Zdesktop with german language.
Also is the date format not correct. Date format is shown as year-month-day and not as day.month.year.
Bugzilla
Wiki
Source
Thunderbird import contact with birthday 
Linear Mode
