it looks like the calendar now has the right date.

Samsung calendar,? Stock launcher or 3rd party wasn't working?

I think OP is referring to the Calendar app icon showing the correct date on the homescreen. I recall an issue recently where the icon stopped showing the correct date.
 
I think OP is referring to the Calendar app icon showing the correct date on the homescreen. I recall an issue recently where the icon stopped showing the correct date.
Yeah that's why I was asking was it 3rd party with Samsung calendar