Calendar will not show all previous dates. Is there an update or fix to access prior years events?

How about after iOS 1.0 was released 15 years ago calendar activity after one year is not searchable? The built in calendar has always only searched back one year. You can go to previous years, assuming you have the calendar set to keep all entries, but you can’t search. You need a 3rd party calendar app such as Fantastical or Week Calendar for a more robust search capability.

If I google “alien abductions” I will get a half million hits, so I consider Google useless for analyzing technical issues.

I’m on 15.2. My primary calendars (22 of them) are all iCloud, and I can view all of them back to before I first imported them from my Palm, back to 1999.

In the Calendar app tap on Calendars at the bottom of the screen. Are all calendars checked?

If you log in to https://icloud.com and click on Calendar do you see older entries?

Also see this support article→Use iCloud.com to restore and recover iCloud information - Apple Support

No, I can choose a date in, say, 2016 and view its events. What is the source for the calendar: iCloud, Google, Microsoft, etc? Can you check other devices that can view the calendar?

How are you scrolling back? I just scrolled back to 2014, and I could have gone further. What view are you in? In the Day view tap on the month name at the top left. You should then be able to scroll back to previous years, month by month. Or tap the Year from the month view and you can scroll by years.

You should be able to go back to any year, as long as you have not set the calendar to not sync content older than a year. That option is in Settings/Calendar.

Go to your calendar source and see if the events are visible there.

I just checked on mine; I can go back to 1999. (That’s because I transferred my calendar from my Palm Treo).