Timezones are not automatically handled by lnav at the moment, which isn't great. Timestamps are parsed and treated as UTC internally, which usually works out fine. You can manually adjust all of the timestamps for a file using the ":adjust-log-time" command:
https://docs.lnav.org/en/latest/commands.html#adjust-log-tim...
That can be useful for doing minor alignments if clocks are slightly out of sync or doing timezone adjustments.
You can also adjust the time programmatically by updating the "time_offset" column in the "lnav_file" table:
https://docs.lnav.org/en/latest/sqltab.html#lnav-file
Sorry I don't have any examples written up to illustrate this at the moment...