Is not a valid time or is not a valid date

If You get the error message "Is not a valid Time" or "Is not a valid date then this is usually to do with regional settings.

The quickest solution is to set regional settings to UK to default the time and date formats correctly and then adjust the courrency to the country of use:

 

 

Set Region to UK

(Type region in your Cortana or Search box)

Then in Advanced set currency to correct currency for your region.