Fix timestamp pattern for consistency
Fix timestamp pattern for consistency

Signed-off-by: Keith W. Campbell <95f8b4a83822d17dd9d3a4fe1dcf2f0c5c806590@ca.ibm.com>
karianna/openjdk-build,AdoptOpenJDK/openjdk-build,karianna/openjdk-build,AdoptOpenJDK/openjdk-build