Add date.strptime and match stdlib subclass behavior

CHANGELOG.md

@@ -8,6 +8,10 @@
 * pass Gregorian to tzinfo.dst #188
 * typing: use int for fold #186
 
+### Added
+
+* Add `date.strptime()` and make `strptime()` preserve subclasses, matching the standard library behavior
+
 
 ## [6.0.2] 2026-08-06
 

jdatetime/__init__.py

@@ -623,6 +623,12 @@ def repl(match):
     def aslocale(self, locale: str) -> date:
         return date(self.year, self.month, self.day, locale=locale)
 
+    @classmethod
+    def strptime(cls, date_string: str, format: str) -> date:
+        """Return a date corresponding to date_string, parsed according to format."""
+        dt = datetime.strptime(date_string, format)
+        return cls(dt.year, dt.month, dt.day, locale=dt.locale)
+
 
 date.min = date(MINYEAR, 1, 1)
 date.max = date(MAXYEAR, 12, 30)
@@ -897,8 +903,8 @@ def tzinfo(self) -> py_datetime.tzinfo | None:
     def fold(self) -> int:
         return self._fold
 
-    @staticmethod
-    def strptime(date_string: str, format: str) -> datetime:
+    @classmethod
+    def strptime(cls, date_string: str, format: str) -> datetime:
         """string, format -> new datetime parsed from a string (like time.strptime())"""
         regex = _directives_to_pattern(re.escape(format))
 
@@ -927,9 +933,9 @@ def strptime(date_string: str, format: str) -> datetime:
                 raise ValueError(f"time data '{date_string}' does not match format '{format}'")
 
         timezone_string = get('z', None)
-        timezone = datetime._timezone_from_string(timezone_string)
+        timezone = cls._timezone_from_string(timezone_string)
 
-        return datetime(
+        return cls(
             year,
             month,
             int(get('d', 1)),

tests/test_jdate.py

@@ -201,3 +201,30 @@ def test_fromisoformat():
 
 def test_resolution():
     assert jdatetime.date.resolution == jdatetime.timedelta(days=1)
+
+
+@pytest.mark.parametrize(
+    ('date_string', 'format'),
+    [
+        ('1405-05-19', '%Y-%m-%d'),
+        ('1405-05-19 13', '%Y-%m-%d %H'),
+        ('1405-05-19 13:45', '%Y-%m-%d %H:%M'),
+        ('1405-05-19 13:45:59', '%Y-%m-%d %H:%M:%S'),
+        ('1405-05-19 13:45:59.123456', '%Y-%m-%d %H:%M:%S.%f'),
+        ('1405-05-19 13:45:59 +0330', '%Y-%m-%d %H:%M:%S %z'),
+    ],
+)
+def test_strptime_discards_time(date_string, format):
+    result = jdatetime.date.strptime(date_string, format)
+
+    assert result == jdatetime.date(1405, 5, 19)
+
+
+def test_strptime_returns_subclass():
+    class MyDate(jdatetime.date):
+        pass
+
+    result = MyDate.strptime('1405-05-19', '%Y-%m-%d')
+
+    assert type(result) is MyDate
+    assert result == MyDate(1405, 5, 19)

tests/test_jdatetime.py

@@ -780,3 +780,13 @@ def test_pickle():
 def test_unpickle_older_datetime_object():
     dt = load_pickle('jdatetime_py3_jdatetime3.7.pickle')
     assert dt == jdatetime.datetime(1400, 10, 11, 1, 2, 3, 30)
+
+
+def test_strptime_returns_subclass():
+    class MyDateTime(jdatetime.datetime):
+        pass
+
+    result = MyDateTime.strptime('1405-05-19 12:34:56', '%Y-%m-%d %H:%M:%S')
+
+    assert type(result) is MyDateTime
+    assert result == MyDateTime(1405, 5, 19, 12, 34, 56)