To change Time Zone settings on your SharePoint Site (including OneDrive), follow the following steps:
- Log-in to your Office365 account.
- Click on the OneDrive tab
- Click on the Gear icon on the top right corner and click Site Settings
- In your Site Settings page, under Site Administration, click on Regional settings
- Click on the Time Zone drop down list and click on (UTC-8:00) Pacific Time (US and Canada)
- Click on OK on the bottom of the page (scroll down if you don't see it).