Iphone 5s calendar not accept entries after ios 7.1 update

Question

after ios 7.1 update the iphone 5s calendar not accept entries but will accept entries from sync with outlook connection via my MS desktop outlook

Answer 1

So, sometimes you discover a "fix" totally by accident. I tried the following and it's worked for me 100% of the time so far. Any entries I make using this have appearded on my iPhone and on any device where I view my calendar. Hope this helps others: 
Open your calendar and then view it in the "month view";
Tap the hybrid view icon which is at the top to the left of the search icon at the top right of the screen; you'l see a list of the days activities at the the bottom of the screen.
Now, tap the "+" icon at the top to the right of the search icon. This will allow you to type in the event, time, date, etc that you want to enter.
Click "done" at the top right when finished. Now, you should see the event that you just entered at the bottom of the screen under the days activities. That should "stick" even if you close the calendar, or whatever. When I checked, it also showed up as it should on other devices. You can edit events, delete them, etc--it's worked for me.
I'm not sure why this worked--or what it's the only way to be able to enter an event since the move to iOS 7.1--but it's working for me--so why ask why??