Premium users can now sync their personal schedule with their Google calendar.
From the web:
Go to your Preference settings (Dashboard > Settings > Preferences).
Click the toggle next to Google calendar synchronization to turn it on.
A Google modal will appear and ask you to sign in to the account you want to use.
You'll also be asked to allow Sling to access your Google account and manage your calendars so be sure to choose Allow.
After that, just click on Save within your Sling settings and your shifts will be synced with your personal Google calendar.
From the app:
Tap the More icon, then choose Settings from the list.
Tap the toggle next to Google calendar integration.
Your web browser will pop up so you can choose the account you want to use and verify your password.
The next screen will verify that you want to allow Sling to access and edit your calendar.
Once you click Allow, you'll be redirected back to the Sling app. Make sure you tap Save at the top right of the screen, and you're all set.
Currently, Sling is only syncing shifts scheduled within the last 7 days and next 14 days. New shifts and changes usually appear after few minutes.