this is my log output
INFO main digestemails - process inbox INFO main digestemails - checking for emails in c:\\development\\DCMail\\email\\KN-Source INFO m
Use %d in your PatternLayout.
%d
Also %d can take a format pattern as in %d{dd MMM yyyy HH:mm:ss,SSS} you can pick and choose the elements that you want. When the format pattern is omitted the date will be in ISO8601 format.
%d{dd MMM yyyy HH:mm:ss,SSS}