Do you find yourself constantly forgetting Mother's Day each year? Are you always confusing Labor Day with Memorial Day? Or perhaps you're afraid you might miss out on some local Cinco de Mayo parties?

Apple provides a great feature in its iPhone Calendar that lets you subscribe to any public Internet Calendar. To make things easier, Apple also provides its own Internet Calendar containing all of the U.S. holidays each year.

Here, we show you how to add Apple's calendar of U.S. holidays to your iPhone:

1. Tap the Settings icon
2. Tap Mail, Contacts, Calendars
3. Scroll down and tap Add Account...
4. Tap Other
5. Tap Add Subscribed Calendar
6. In the server field, input: ical.mac.com/ical/US32Holidays.ics - then tap Next
7. On the next screen, change the name of the calendar under "Description" if you choose - then tap Save

That's it!

You'll now find each and every U.S. holiday within the iPhone Calendar app, and they'll appear just like any other appointment.

This procedure can also be used to add any other public Internet Calendar to your iPhone calendar. You can find a list of Apple's here, and there are many more available on various sites around the Web.