A Date field in Vault does not reflect the time zone that is configured in the affected user's profile in reports.
Entry Actions configured in a Lifecycle are executed using the Vault Time Zone.
When a document is created in Vault, the Created Date field reflects the time zone of the user who creates the document. A Date field that corresponds to the execution of a Lifecycle entry action reflects the Vault Time Zone since the entry action is executed by the System User.
Vault Admin Documentation: Vault Time Zone