Sort:  

Thanks for reporting. I don't have this problem.
Could you give me more details? What is your operating system and the version of your browser?

I access the Site with Safari on my iPhone running the latest iOS version. The correct time is shown for several seconds and then changes to NaN.

I think it is corrected now :)

The correct time is shown for several seconds and then changes to NaN

This information was fundamental. Thanks.