If you change the time zone on a system running Enterprise System Manager (ESM), the timestamp of ESM events might not match the time that the events actually occurred.
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When ESM services are started, ESM reads the timezone configured in the operating system. If the system’s time zone is then changed, you must restart the ESM services (ESMImporter, ESMWebservice, ESMDatarolloff, and ESMSendemail) to implement the change in ESM, or restart the system.
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ESM-Event-Timestamp-Incorrect-After-Time-Zone-Change.pdf