Description of problem:
In OSE 3.2.0 + RHEL 7.2, the EFK templates do not set the timezone of fluentd to the timezone of the host, leading the year detection filter to fail and filling the logs with:
"no implicit conversion of nil into String "

Full logs:
2016-06-14 06:48:52 -0400 [info]: reading config file path="/etc/fluent/fluent.conf"
2016-06-14 06:49:00 -0400 [warn]: failed to expand `%Q[#{ Time.at(time) > Time.now ? (temp_time = Time.parse(Time.at(time).to_s.gsub(Time.at(time).year.to_s, (tag_parts[3].nil? ? Time.at(time).year.to_s : tag_parts[3][9,4]) )).to_datetime.to_s; Time.parse(temp_time) > Time.now ? Time.parse(temp_time.gsub(Time.parse(temp_time).year.to_s, (Time.parse(temp_time).year - 1).to_s )).to_datetime.to_s : Time.parse(temp_time).to_datetime.to_s ) : Time.at(time).to_datetime.to_s }]` error_class=TypeError error="no implicit conversion of nil into String"

The solution is to update the deployment config to use the same timezone in the fluentd container as in the node:
# oc edit dc logging-fluentd
## add under volumeMounts:
            - name: localtime
              mountPath: /etc/localtime
              readOnly: true
## add under volumes:
          - name: localtime
            hostPath:
              path: /etc/localtime

Upstream fix: ff4526ad354a5d58ef6b12171e23e0b2c41b2c35
KCS: https://access.redhat.com/solutions/2377771