WoltLab/WCF — pull request #1323 by fragsalat (2013-05-31 12:58:39+00:00)
Title: Fixed ZipWriter getDosDatetime on NaN value

Fixes the Zip creation when the timestamp, passed through addFile, is not a number.
Otherwise getDosDatetime will add 11 Bytes instead of a double word which makes the whole file corrupt.