EM.log entries has different date formats.

Document ID : KB000072867
Last Modified Date : 15/03/2018
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Introduction:
   The EM.log is just a redirection of standard out & standard error when the EM is started with EM_HOME/bin/EMCtrl.sh.
    Its size is not controlled by any of the log4j properties in the EM properties file so the em.log will grow unlimited
Question:

  Why are the Date and Time format different as shown below?

2/16/18 09:21:41.266 AM EST [INFO] [main] [Manager.AppMap] Subscribed consumer of type TTProcessor to all registered generators of the event type TransactionTraceEvent.

Feb 16, 2018 9:21:41 AM org.springframework.web.context.ContextLoader initWebApplicationContext
INFO: Root WebApplicationContext: initialization completed in 2476 ms
Environment:
  CA APM 10.5.2
Answer:

  This is by design.

  The 2/16/18 line is the Normal Introscope log Message.
  The Feb 16 message is a service message .
  The service message entries will be logged on EM.log, not Introscope log