When users on your Jira instance are from different time zones, you might start wondering which of the time zones is used to display the worklogs data.
Currently, Worklogs allow you to choose one of the 3 options of the time zone handling. They are available in the Options menu.
Users timezone (default, displays logged hours using the time zone of the user that logged the time)
My timezone (displays all logged hours in your own timeozne)
Jira timezone (displays all logged hours in your Jira isntance timezone)