title: Grafana field type Transformation outputs incorrect timestamp
body: <p><strong>Task</strong>: I want to transform a bigint data column [which i send from aws athena to grafana] (see picture 1.) to a timestamp which generates my timeseriesdata inside grafana.</p>
  <p><strong>Problem</strong>: My problem is, that after i transform that bigint column (see picture 2.) it shows completly unuseable timeformats like the year 2610.</p>
  <p><strong>How can i solve this problem so i have a correct timestamp format inside my Grafana Instance.</strong></p>
  <p><a href="https://i.stack.imgur.com/Q1qol.png" rel="nofollow noreferrer">1. Dataformat before</a></p>
  <p><a href="https://i.stack.imgur.com/1q3mC.png" rel="nofollow noreferrer">2. Dataformat after Transformation</a></p>