There are two examples in the action below,
UTC to PST (28800 seconds difference)
UTC to PDT (25200 seconds difference)
You can copy/paste the below code into your story board.
{"standardLibVersion":"20","actionRuntimeVersion":"4","agents":[{"disabled":false,"name":"Timezone","description":null,"options":"{\"mode\":\"message_only\",\"PST\":\"<<DATE(\\\"now\\\", \\\"%s\\\") |> MINUS(%, 28800) |> DATE(%, \\\"%Y-%m-%dT%H:%M:%S\\\")>>\",\"PDT\":\"<<DATE(\\\"now\\\", \\\"%s\\\") |> MINUS(%, 25200) |> DATE(%, \\\"%Y-%m-%dT%H:%M:%S\\\")>>\"}","position":{"x":705,"y":780},"type":"eventTransformation","timeSavedUnit":"minutes","timeSavedValue":0,"monitorAllEvents":false,"monitorFailures":false,"monitorNoEventsEmitted":null,"spotlightTemplate":null,"spotlightWriters":[],"form":null,"cardIconName":null,"cardIconColor":null,"createdFromTemplateGuid":null,"createdFromTemplateVersion":null}],"links":[],"diagramNotes":[]}