AST4ADT

Hello, I just download files tzdata*.tar.gaz from you FTP server and to my surprise there is no AST4ADT file after compiling? I have a server in Montreal(Canada) so I can use the EST5EDT file, but also need to update one in Halifax (Canada), and I cannot see any AST4ADT file. Am I missing something here or is there an omission in the tzdata file? Thanks René Guitar Statistics Canada