Two of the enhancements to Gramps’ Date type phrases for 5.2 were in open-ended date spans: ‘From’ and ‘To’ dates.
Errors when importing From and To dates were SIX of of the Date Validation issues.
Now that Gramps supports those Date Span Type formats, perhaps we could have a Developer discussion thread that describes how to add support for such an expansion in Gramps? (Or perhaps that came for free when the Date Handler was improved??? Both import and export of open-ended date spans worked with the 5.2.1 version.)
Used as an example, people might be willing to tackle enhancing the GEDCOM 5.5.1 import one-tag-at-a-time. And possibly adding some common GEDCOM dialect custom tags too.
Likewise, the tests 31-34 (e.g., #33 “INT 3 MAR 1914 (Phrase)”) tag just means the phrase is known as an internal date format for the exporting software. I think the expectation may be wrong for these tests. To pass the test, all Gramps would have to do is attempt to parse the phrase and convert it to a date instead of text. (Which is easy to do with a 3-line SuperTool script as a post-import process.) But I wonder if the GEDCOM intent wasn’t to have a Date Display Format override for a valid date?