
Apple Watch is the perfect device for quickly glancing at the things you need to do today or to fill you in on your plans for the weekend. It is also a useful device for quickly setting up a reminder without needing to pull out an iPhone.

While much of the setup for Calendars is done on iPhone, you can use Apple Watch to respond to invites, add a quick event, and get alerts to remind you when to leave for your next appointment.
Using the Calendar App
The Calendar App on Apple Watch is tied to Apple's native Calendar app on iOS, which is also compatible with OS X. I sync my Calendar app with Google Calendar, but it is compatible with a number of services, like Exchange, Facebook, Yahoo, and remote servers via CalDAV. In order to use the Calendar app on Apple Watch, you must be using it in some form on iPhone.
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Article Link: How to Add Reminders and View Your Daily Schedule on Apple Watch