[Other] Overflow error while exporting documents before UNIX epoch

[Yann21]

I tried to run the document_exporter and received the following error:
OverflowError: mktime argument out of range

It turns out that I had input a document as dating from 1900 and any date before UNIX epoch (1970) will return the previous overflow error. For future reference, changing the date solved my problem and I was able to export my documents.