v0.4

• Undate is now Calendar aware / Calendar explicit; default is Gregorian
  • New BaseCalendarConverter class, with additional methods required for calendar converters
  • HebrewDateConverter: Parsing and calendar conversion for Hebrew/Anno Mundi
  • IslamicDateConverter: Parsing and calendar conversion for Islamic/Hijri
  • GregorianDateConverter: basic Gregorian calendar logic
  • undate.Calendar class to track Undate object calendar, and match with calendar converters
• BaseDateConverter class now includes nested/descendant subclasses when looking
  for available converters
• Undate.to_undate method to convert supported date objects to Undate (datetime.date, datetime.datetime, and internal undate.date.Date class)
• UndateInterval improvements
  • Can be initialized with Undate objects or any type supported by Undate.to_undate
  • New method for contains (in), to determine if another interval or date is contained by an interval
  • New method intersection to determine the overlap between two UndateInterval objects
• EDTF parser : fixed day parsing for some unsupported cases
• Dropped support for Python 3.9
• Reorganized examples folder to avoid unnecessary nesting
  • ISMI data has been updated from older JSON data to examples in RDF (turtle)

What's Changed

(auto-generated list of changes)

• Citation file by @rlskoeser in #70
• Reorganize and improve documentation by @rlskoeser in #81
• Add example usage to the readme #75 by @rlskoeser in #82
• Check notebooks in CI check workflow #76 by @rlskoeser in #83
• Configure mypy pre-commit check by @rlskoeser in #91
• Consolidate setup.cfg and pyproject.toml; drop tox; revamp sphinx docs by @rlskoeser in #88
• Update contributor documentation with branching guidelines by @rlskoeser in #94
• Revise optional dependency groups so dev implies test by @rlskoeser in #96
• Test against python 3.13 by @rlskoeser in #97
• Use numpy datetime64 instead of datetime.date #77 by @rlskoeser in #84
• Make EDTF parser available as undate formatter; handle 5+ digit years by @rlskoeser in #89
• preliminary str parse and format methods by @rlskoeser in #90
• Rename formatters submodule and classes to converters by @rlskoeser in #101
• EDTF demo/validation notebook by @rlskoeser in #98
• Release v0.3 by @rlskoeser in #103
• updated ismi sample data for development branch by @robcast in #104
• Add converter for hebrew calendar based on hijri calendar by @rlskoeser in #108
• Add support for converting from Hijri calendar to undate and undate interval by @rlskoeser in #107
• Document that duration calculation is inclusive / closed interval by @rlskoeser in #111
• Move interval object and tests into separate files by @rlskoeser in #115
• Find all converter subclasses / descendants by @rlskoeser in #110
• Interval logic improvements: type/range validation, intersection method, contains/in functionality by @rlskoeser in #114
• Try using uv for unit test workflow by @rlskoeser in #113
• Support conversion from internal Date class to Undate #119 by @rlskoeser in #122
• Use islamic for Islamic/Hijri calendar classes #120 by @rlskoeser in #123
• Reorganize examples and update readme / contents #121 by @rlskoeser in #124

Full Changelog: 0.3...0.4