edtf-validate

Valid EDTF provides validity testing against levels 0-2 of the official EDTF Specification released February 2019. You might find it most useful for tasks involving date validation and comparison. Typical usage often looks like this:

>>> from edtf_validate.valid_edtf import is_valid, isLevel2
>>> is_valid('2015-03-05')
True
>>> is_valid('Jan 12, 1990')
False
>>> isLevel2('1998?-12-23')
True
>>> conformsLevel1('-1980-11-01/1989-11-30')
True

Or just straight from the command line...

$ edtf-validate 2015
2015	True

NOTE

Please take special care to note the name difference between command line usage and the other usage cases:

When importing into python, use an underscore separator, e.g. import edtf_validate.
When using the command line (or when talking about the package name), use a dash separator, e.g. $ edtf-validate.

What exactly does edtf-validate do?

This program will:

Determine if a string is valid EDTF according to the specifications provided by the Library of Congress.
Allow the user to test if a date is a feature of each level of EDTF using isLevel* functions. i.e. '1964/2008' is a feature introduced in Level 0 rules, and '1964~/2008~' is a feature introduced in Level1.
Allow the user to test if a date is valid for each level of EDTF using conformsLevel* functions. i.e. '2014' is a feature introduced in Level 0 and valid for it, but also valid in Level 1 and Level 2 as all EDTF levels validate dates of itself and levels below it. Another example, '2001-25' is a feature introduced in Level 2 hence valid for Level 2, but it is not a valid date in Level 0 and Level 1.

If you're confused what exactly the different levels of EDTF validation implicate, you can read about it in exhaustive detail here.