Code
Note! This update is only needed if you had problems with "invalid argument to date encode" error.
What's new in 4.2.21.2 since 4.2.21.1:
[*] If there were an invalid birthday date stored in the address book, The Bat! did only report error "invalid argument to date encode", without further clarification for the user what might have caused the error. Now more detailed information is given.