At the moment, Calendar is not available for direct download on a computer. However, you can use emulators to run it on PC. The downside is that using Calendar with an emulator might slow down your computer's performance.
Learn how to use Calendar on your computer in these 5 simple steps:
Keep track of your schedule and share it with others using Calendar. Create separate calendars for home, school, work and more. See all your calendars in a single window or view just the calendars you want. Calendar works with iCloud, Yahoo, Google and other accounts. So every change you make on one device automatically appears across all your devices. Features • View all your calendar accounts in a single app and see all your events in List, Day, Week or Month view (as well as Year view on iPad). • Touch and hold a blank space in your day to quickly create a new event. Or drag an appointment to change your schedule. • Add the address of your event to receive Time to Leave notifications based on how long it will take to reach your destination. • Send and receive meeting invitations with iCloud, Exchange and CalDAV servers. • Add a special calendar for the birthdays of people in your Contacts list. • Subscribe to calendars for holidays, your favourite sports teams and more.