Update Migration from Cloud to Server documentation to include Timezone details

Problem Definition

Jira Cloud system time is in UTC. Migration from Jira Cloud to Jira Server means a potential different system time. Users may encounter incorrect times displayed in Jira after the migration.

Suggested Solution

Update the migration documentation

• https://confluence.atlassian.com/adminjiraserver/migrating-from-jira-cloud-to-server-applications-938846963.html

To include a workaround for applying JVM parameter -Duser.timezone=UTC on Step 4 before importing the Cloud data to Jira Server. Once restored, they may remove the JVM parameter.

Why this is important

Users will be seeing wrong display time in all date format values

Notes

The workaround does not work if the JIRA Sever DB is MySQL. In case you use MySQL you need to:

1. Export from the source JIRA Server using MySQL
2. Import into a staging JIRA Server with PostgreSQL (configured to have the same timezone as the source JIRA)
3. Stop JIRA
4. Change the JVM timezone to UTC
5. Start JIRA and export the backup