during the development of my App „My Business“, whih includes a lot of important data, I allways have trouble with the Date and Time format. As it is not very „german“
Suddenly a few weeks ago all my Start and End cols changed randomly from 2019 to 2139 or 1899. Therefore all my timebased invoicing etc. didn’t worked anymore. To fix this I’ve pasted from a backup Excel all these times.
But now … Some worked an some not (as you can see on the screenshot)
Could you give me a hint what may be the difference between this times?? Or is there a more international Date&Time Version under develpment?