Calendar Icon on my phone no longer works?

[Windows Central Question]

I have a Nokia Lumia 520 mobile phone. It asked me to update to the latest version, of which I accepted. But since then I am no longer able to use my Calendar? I have reset my phone but still to no avail?

 

[RumoredNow]

Make sure your accounts sync.

Settings > email + accounts

Tap each account name to enter it's settings and see what is enabled, including calendar. Hold down on each account name and select "sync" from the popup menu.