ValueError when using level 0 interval in Django field

[jmiguelv]

EDTF is throwing a ValueError exception when saving an EDTF field in Django when using a level 0 interval date, for example 1792-04-20/1802-03-27:

File "/usr/local/lib/python3.7/site-packages/edtf/fields.py" in pre_save
100. edtf = text_to_edtf(natural_text)

File "/usr/local/lib/python3.7/site-packages/edtf/natlang/en.py" in text_to_edtf
37. result = text_to_edtf_date(t)

File "/usr/local/lib/python3.7/site-packages/edtf/natlang/en.py" in text_to_edtf_date
209. date1 = dt1.isoformat()[:10]

Exception Type: ValueError at /admin/utils/date/3794/change/
Exception Value: offset must be a timedelta strictly between -timedelta(hours=24) and timedelta(hours=24).

Has anyone seen this issue before?