This article will be on adding your Zimbra calendar into the native Mac calendar app on MacOS.
Instructions
Adding Zimbra Account as CalDAV:
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Open the Calendar app and click on Calendar at the top left of the screen and click Add Account:

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Click Other CalDAV Account:

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From the dropdown select “Manual” and add in the below information and Sign In:
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User Name: Your Email Account
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Password: Your Email Password
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Server Address: https://mail.ossds.net

 
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After clicking sign in you will be able to toggle both calendar and reminders which will use your Zimbra calendar and reminders and port them over to your Mac.