The time used in the charts is your local time.
If you want to change the time zone, please follow these steps:
1. Go to any asset's page and click on 'Chart':
2. At the top right hand corner of the chart, you will see two arrows: Click on them to expand the chart and bring up the chart settings.
3. Click on the settings wheel. In the drop down menu, click Change Timezone.
4. Choose the time zone you wish to use.