All my calendar events in my iPhone have disappeared?

Today I was checking my calendar and noticed the whole thing is cleared. All my events are gone with no rhyme or reason. (I have the iPhone 5 btw) I tried a hard reset, that didn't fix it, and I'm not sure If I saved all my calendar info to iCloud. I also went to sync and set the events 1 month back, nothing. Is there any way to fix this?

Hmm when was your latest
iCloud backup? And if you've backed up before the erasing. Just restore your phone and choose the backup before the erasing. Only if you're sure you've backed it up and it automatically backed up before the erasing

Open your calendar and go to the bottom and click "calendars" and click "show all".