Failed to Export Data - Invalid Argument Error When Exporting Data

[zakropotch]

Good day, I was trying to export my Calibre data from my current library, and I get the following message a short while into the process:

calibre, version 5.43.0
ERROR: Failed: Failed to export data. Click "Show details" for more information.
Traceback (most recent call last):
File "calibre\gui2\dialogs\exim.py", line 138, in run_action
File "calibre\utils\exim.py", line 194, in export
File "calibre\db\cache.py", line 74, in call_func_with_lock
File "calibre\db\cache.py", line 2438, in export_library
File "calibre\db\cache.py", line 647, in format_metadata
File "calibre\db\backend.py", line 1397, in format_metadata
File "calibre\utils\date.py", line 250, in utcfromtimestamp
OSError: [Errno 22] Invalid argument

I don't know how to fix this? Any help would be appreciated, thanks.

[kovidgoyal]

This is caused by one of the files in the calibre library having a negative timestamp. I will add a workaround for it in the next calibre release. https://github.com/kovidgoyal/calibr...14804808f73976

[zakropotch]

Thank you for the workaround. After updating Calibre to the latest release, I am still having an issue. I uploaded 2 screenshots shown side-by-side of both the Source and Destination folder for you to see what I'm getting. After exporting all the original Calibre library data from a folder called, "Calibre Library" to a new folder called, "Calibre", the destination folder shows the imported data as just data files. Is this how it's supposed to work? I was under the impression the entire folder would be copied over exactly.

[kovidgoyal]

yes its just data files. https://manual.calibre-ebook.com/faq...ter-to-another

[theducks]

Originally Posted by zakropotch

Thank you for the workaround. After updating Calibre to the latest release, I am still having an issue. I uploaded 2 screenshots shown side-by-side of both the Source and Destination folder for you to see what I'm getting. After exporting all the original Calibre library data from a folder called, "Calibre Library" to a new folder called, "Calibre", the destination folder shows the imported data as just data files. Is this how it's supposed to work? I was under the impression the entire folder would be copied over exactly.

When you started the Export, there was ALSO a menu Import. That is the other half of the process.
Export 'packages' everything for transit (or backup). The size of the pieces is done for cross compatibility reasons. (It works across OS).
Import allows the restoration (If you have multiple Libraries, you can choose to not do ALL of them.)

[zakropotch]

Great! Thank you for that information.

[theducks]

Originally Posted by zakropotch

Great! Thank you for that information.

Launching Import works pretty much like a 'spanned-zip'. You just need to select any member of the archive (they all, do need to be in the same place).
It will locate the master file.