Hello,

Thank you for reaching out to us!

Is the file you sent the same as the file from the screenshot? I just tried to reproduce the problem by

1. Changed my local timezone to match yours (CET)
2. Created a date based study
3. Change look and feel settings to include z (from the screenshot)
4. Create a dataset using that xls file
5. Data uploaded successfully

Let me know what you think, and please check if its the same.

Thanks,
Chet