The recording time zone can be unknown or carried by the recording (JZR and JFR).
When not available, it is possible to define it through the Jeyzer Web Analyzer interface or through the analysis profile configuration. It is interesting to define it as soon as you plan to display the analysis in another time zone, known as display time zone.
If the recording time zone is not available (meaning unknown), the analyzer local time zone is taken.
Note : the JFR recordings are always UTC time based.