Imported year is always 1970

Hello, I'm trying to import nodes from CSV with a year in a CCK field date with custom input 'Y' and I'm always getting 1970.
I have choose the custom input 'Y' in CCK field and at the import.
I'm using Pressflow 6.20 and the last version of Date(6.x-2.7) and Node Import(6.x-1.0).