My Glow app is showing the wrong day.

Hi there 
​I've used Glow before and fallen pregnant using it. Unfortunately, we experienced a miscarriage though and are using Glow again to try again. 
​I've downloaded the app again and all seems to be fine except that it's telling me today is New Year's Day when it's not, it's NYE day. I'm located in the UK. Any help is much appreciated :)