extracted files having a creation/modification date of 30.12.1899

Bug description

In Superset 6.1.0, exporting multiple reports as a ZIP archive results in extracted files having a creation/modification date of 30.12.1899 in Windows Explorer. The issue affects both CSV and XLSX exports and only occurs when files are bundled into a ZIP archive. Single-file downloads preserve correct timestamps.

if i extract the zip-file with 7-Zip, the last modified field is empty.

Screenshots/recordings

see comment section

Superset version

6.1.0

Python version

I don't know

Node version

I don't know

Browser

Firefox

Additional context

No response

Checklist

• I have searched Superset docs and Slack and didn't find a solution to my problem.
• I have searched the GitHub issue tracker and didn't find a similar bug report.
• I have checked Superset's logs for errors and if I found a relevant Python stacktrace, I included it here as text in the "additional context" section.