Synchronizing your computer time is important because some exchanges won't accept API calls if your clock is incorrect. Below is a guide to sync your computer time on macOS.

Step 1: Click the "Apple" menu icon in the top left corner of your screen. 

Step 2: Click "System Preferences" > "Date & Time". 

Step 3: Check the box that says "Set Date & Time Automatically" 

Note: You may have to click the bottom left "Lock" icon in order to make changes on this screen.