Fix time serializer to always emit precision and avoid 00 day/month

- Always include precision in time JSON, defaulting to 11 (day) if not stored
- Replace 00 month/day with 01 to satisfy Wikibase API validation
- Support /precision suffix embedded in full timestamp strings

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ghuron

src/wdpy/snak.py

@@ -96,11 +96,17 @@ def json(self) -> str:
                         if len(v) > 1 and v[1]: res['value']['lowerBound'] = v[1]
                         if len(v) > 2 and v[2]: res['value']['upperBound'] = v[2]
                 case 'time':
-                    res = {'type': 'time', 'value': {'time': f"+{v[0][:4]}-{v[0][4:6]}"
-                           f"-{v[0][6:]}T00:00:00Z" if len(v[0]) == 8 else v[0],
-                           'timezone': 0, 'before': 0, 'after': 0}}
-                    if len(v) > 1 and v[1]:
-                        res['value']['precision'] = int(v[1]) if v[1].isdigit() else v[1]
+                    time_str, _, suffix = v[0].partition('/')
+                    precision = (int(suffix) if suffix.isdigit() else
+                                 int(v[1]) if len(v) > 1 and v[1] and v[1].isdigit() else 11)
+                    if len(time_str) == 8:
+                        mo = time_str[4:6] if time_str[4:6] != '00' else '01'
+                        day = time_str[6:] if time_str[6:] != '00' else '01'
+                        time_out = f"+{time_str[:4]}-{mo}-{day}T00:00:00Z"
+                    else:
+                        time_out = time_str
+                    res = {'type': 'time', 'value': {'time': time_out,
+                           'timezone': 0, 'before': 0, 'after': 0, 'precision': precision}}
                     if len(v) > 2 and v[2]:
                         res['value']['calendarmodel'] = (f"http://www.wikidata.org/entity"
                         f"/{v[2]}" if not v[2].startswith('http') else v[2])

tests/unit/test_snak.py

@@ -162,6 +162,19 @@ def test_time(self, *_):
         snak, expected = ETHALONS['time']
         self.assertEqual(json.loads(snak.json()), expected)
 
+    @mock.patch.object(Snak, 'type_of', return_value='time')
+    def test_time_no_precision_defaults_to_11(self, *_):
+        snak = Snak('P813', ('20240526',))
+        payload = json.loads(snak.json())
+        self.assertEqual(11, payload['datavalue']['value']['precision'])
+
+    @mock.patch.object(Snak, 'type_of', return_value='time')
+    def test_time_precision_suffix_in_time_string(self, *_):
+        snak = Snak('P813', ('+2013-01-00T00:00:00Z/10',))
+        payload = json.loads(snak.json())
+        self.assertEqual(10, payload['datavalue']['value']['precision'])
+        self.assertEqual('+2013-01-00T00:00:00Z', payload['datavalue']['value']['time'])
+
     def test_monolingual(self, *_):
         snak, expected = ETHALONS['monolingual']
         self.assertEqual(json.loads(snak.json()), expected)