An amazing piece of research has been posted on Reddit today. I won't spoil the surprise, but you can read the details there, and make sure you have your phone! Yes, anyone with a phone can now prove that the ARC Day demo was either fake or the ARC device (which includes the tablet, per head of ARC division) is malfunctioning horribly. The malfunctioning possibility is bad, because Nanox claims to have 1) submitted this device for FDA clearance in September and 2) used it in human trials. While the author does not spell it out, any submission of this device for clearance or approval to the FDA or any other regulatory agency should be presumed fraudulent - either the device is fake or it is malfunctioning, and Nanox obviously knows it.
I won't address all the "objections" I saw in that thread and elsewhere, but the issue clearly has no relation to time differences or date formats among countries. Personally, I used an Android phone and the first free QR reader app I could find. Here is a frame grab from the ARC Day video that worked for me.