Add PlanetaryTime.time and .date convenience properties

PROJECT.md

@@ -76,14 +76,14 @@ Moon and dwarf planets (Pluto, Ceres, Eris) may be added later.
 - Project scaffolded (Poetry, src layout, tests directory)
 - No implementation yet
 
-## TODO
+## Pending work
 
-- Define `Body` enum with rotation periods
-- Define `Epoch` enum and epoch registry
-- Implement core `PlanetaryTime` class
-- Implement conversion from Earth `datetime`
-- Implement `__str__` / `__repr__`
-- Write tests for conversion accuracy
-- Write tests for epoch switching
-- Populate README with usage examples
-- Implement `scripts/refresh_data.py` — fetches rotation periods, orbital periods and discovery dates from Wikidata SPARQL endpoint and regenerates hardcoded data in `body.py`, `moon.py` and `epoch.py`; script is not part of the distributed package
+- TODO: Define `Body` enum with rotation periods
+- TODO: Define `Epoch` enum and epoch registry
+- TODO: Implement core `PlanetaryTime` class
+- TODO: Implement conversion from Earth `datetime`
+- TODO: Implement `__str__` / `__repr__`
+- TODO: Write tests for conversion accuracy
+- TODO: Write tests for epoch switching
+- TODO: Populate README with usage examples
+- TODO: Implement `scripts/refresh_data.py` — fetches rotation periods, orbital periods and discovery dates from Wikidata SPARQL endpoint and regenerates hardcoded data in `body.py`, `moon.py` and `epoch.py`; script is not part of the distributed package