feat: add temporal operations

src/safeds/data/tabular/containers/_lazy_temporal_cell.py

@@ -31,6 +31,24 @@ def __sizeof__(self) -> int:
     # Temporal operations
     # ------------------------------------------------------------------------------------------------------------------
 
+    def century(self) -> Cell[int]:
+        return _LazyCell(self._expression.dt.century())
+
+    def weekday(self) -> Cell[int]:
+        return _LazyCell(self._expression.dt.weekday())
+
+    def week(self) -> Cell[int]:
+        return _LazyCell(self._expression.dt.week())
+
+    def year(self) -> Cell[int]:
+        return _LazyCell(self._expression.dt.year())
+
+    def month(self) -> Cell[int]:
+        return _LazyCell(self._expression.dt.month())
+
+    def day(self) -> Cell[int]:
+        return _LazyCell(self._expression.dt.day())
+
     def datetime_to_string(self, format_string: str = "%Y/%m/%d %H:%M:%S") -> Cell[str]:
         if not _check_format_string(format_string):
             raise ValueError("Invalid format string")

src/safeds/data/tabular/containers/_temporal_cell.py

@@ -9,12 +9,9 @@
 
 class TemporalCell(ABC):
     """
-    A class that contains temporal methods for a column.
+    Namespace for operations on temporal data.
 
-    Parameters
-    ----------
-    column:
-        The column to be operated on.
+    This class cannot be instantiated directly. It can only be accessed using the `dt` attribute of a cell.
 
     Examples
     --------
@@ -31,6 +28,150 @@ class TemporalCell(ABC):
     +------------+
     """
 
+    @abstractmethod
+    def century(self) -> Cell[int]:
+        """
+        Get the weekday of the underlying date(time) data.
+
+        Returns
+        -------
+            A cell containing the weekday as integer.
+
+        Examples
+        --------
+        >>> from safeds.data.tabular.containers import Column
+        >>> import datetime
+        >>> column = Column("example", [datetime.date(2022, 1, 1)])
+        >>> column.transform(lambda cell: cell.dt.century())
+        +---------+
+        | example |
+        |     --- |
+        |     i32 |
+        +=========+
+        |      21 |
+        +---------+
+        """
+
+    @abstractmethod
+    def weekday(self) -> Cell[int]:
+        """
+        Get the weekday of the underlying date(time) data.
+
+        Returns
+        -------
+            A cell containing the weekday as integer.
+
+        Examples
+        --------
+        >>> from safeds.data.tabular.containers import Column
+        >>> import datetime
+        >>> column = Column("example", [datetime.date(2022, 1, 1)])
+        >>> column.transform(lambda cell: cell.dt.weekday())
+        +---------+
+        | example |
+        |     --- |
+        |      i8 |
+        +=========+
+        |       6 |
+        +---------+
+        """
+
+    @abstractmethod
+    def week(self) -> Cell[int]:
+        """
+        Get the week of the underlying date(time) data.
+
+        Returns
+        -------
+            A cell containing the week as integer.
+
+        Examples
+        --------
+        >>> from safeds.data.tabular.containers import Column
+        >>> import datetime
+        >>> column = Column("example", [datetime.date(2022, 1, 1)])
+        >>> column.transform(lambda cell: cell.dt.week())
+        +---------+
+        | example |
+        |     --- |
+        |      i8 |
+        +=========+
+        |      52 |
+        +---------+
+        """
+
+    @abstractmethod
+    def year(self) -> Cell[int]:
+        """
+        Get the year of the underlying date(time) data.
+
+        Returns
+        -------
+            A cell containing the year as integer.
+
+        Examples
+        --------
+        >>> from safeds.data.tabular.containers import Column
+        >>> import datetime
+        >>> column = Column("example", [datetime.date(2022, 1, 9)])
+        >>> column.transform(lambda cell: cell.dt.year())
+        +---------+
+        | example |
+        |     --- |
+        |     i32 |
+        +=========+
+        |    2022 |
+        +---------+
+        """
+
+    @abstractmethod
+    def month(self) -> Cell[int]:
+        """
+        Get the month of the underlying date(time) data.
+
+        Returns
+        -------
+            A cell containing the month as integer.
+
+        Examples
+        --------
+        >>> from safeds.data.tabular.containers import Column
+        >>> import datetime
+        >>> column = Column("example", [datetime.date(2022, 1, 9)])
+        >>> column.transform(lambda cell: cell.dt.month())
+        +---------+
+        | example |
+        |     --- |
+        |      i8 |
+        +=========+
+        |       1 |
+        +---------+
+        """
+
+    @abstractmethod
+    def day(self) -> Cell[int]:
+        """
+        Get the day of the underlying date(time) data.
+
+        Returns
+        -------
+            A cell containing the day as integer.
+
+        Examples
+        --------
+        >>> from safeds.data.tabular.containers import Column
+        >>> import datetime
+        >>> column = Column("example", [datetime.date(2022, 1, 9)])
+        >>> column.transform(lambda cell: cell.dt.day())
+        +---------+
+        | example |
+        |     --- |
+        |      i8 |
+        +=========+
+        |       9 |
+        +---------+
+        """
+
     @abstractmethod
     def datetime_to_string(self, format_string: str = "%Y/%m/%d %H:%M:%S") -> Cell[str]:
         """

tests/safeds/data/tabular/containers/_temporal_cell/test_century.py

@@ -0,0 +1,20 @@
+import datetime
+
+import pytest
+
+from tests.helpers import assert_cell_operation_works
+
+
+@pytest.mark.parametrize(
+    ("expected", "input_date"),
+    [
+        (18, datetime.datetime(1800, 1, 9, 23, 29, 1, tzinfo=datetime.UTC)),
+        (21, datetime.date(2022, 1, 1)),
+    ],
+    ids=[
+        "ISO datetime",
+        "ISO date",
+    ],
+)
+def test_get_day(input_date: datetime.date, expected: bool) -> None:
+    assert_cell_operation_works(input_date, lambda cell: cell.dt.century(), expected)

tests/safeds/data/tabular/containers/_temporal_cell/test_day.py

@@ -0,0 +1,20 @@
+import datetime
+
+import pytest
+
+from tests.helpers import assert_cell_operation_works
+
+
+@pytest.mark.parametrize(
+    ("expected", "input_date"),
+    [
+        (9, datetime.datetime(2022, 1, 9, 23, 29, 1, tzinfo=datetime.UTC)),
+        (1, datetime.date(2022, 1, 1)),
+    ],
+    ids=[
+        "ISO datetime",
+        "ISO date",
+    ],
+)
+def test_get_day(input_date: datetime.date, expected: bool) -> None:
+    assert_cell_operation_works(input_date, lambda cell: cell.dt.day(), expected)

tests/safeds/data/tabular/containers/_temporal_cell/test_month.py

@@ -0,0 +1,20 @@
+import datetime
+
+import pytest
+
+from tests.helpers import assert_cell_operation_works
+
+
+@pytest.mark.parametrize(
+    ("expected", "input_date"),
+    [
+        (3, datetime.datetime(2022, 3, 9, 23, 29, 1, tzinfo=datetime.UTC)),
+        (1, datetime.date(2022, 1, 1)),
+    ],
+    ids=[
+        "ISO datetime",
+        "ISO date",
+    ],
+)
+def test_get_month(input_date: datetime.date, expected: bool) -> None:
+    assert_cell_operation_works(input_date, lambda cell: cell.dt.month(), expected)

tests/safeds/data/tabular/containers/_temporal_cell/test_week.py

@@ -0,0 +1,20 @@
+import datetime
+
+import pytest
+
+from tests.helpers import assert_cell_operation_works
+
+
+@pytest.mark.parametrize(
+    ("expected", "input_date"),
+    [
+        (10, datetime.datetime(2023, 3, 9, 23, 29, 1, tzinfo=datetime.UTC)),
+        (52, datetime.date(2022, 1, 1)),
+    ],
+    ids=[
+        "ISO datetime",
+        "ISO date",
+    ],
+)
+def test_get_week(input_date: datetime.date, expected: bool) -> None:
+    assert_cell_operation_works(input_date, lambda cell: cell.dt.week(), expected)

tests/safeds/data/tabular/containers/_temporal_cell/test_weekday.py

@@ -0,0 +1,20 @@
+import datetime
+
+import pytest
+
+from tests.helpers import assert_cell_operation_works
+
+
+@pytest.mark.parametrize(
+    ("expected", "input_date"),
+    [
+        (4, datetime.datetime(2023, 3, 9, 23, 29, 1, tzinfo=datetime.UTC)),
+        (6, datetime.date(2022, 1, 1)),
+    ],
+    ids=[
+        "ISO datetime",
+        "ISO date",
+    ],
+)
+def test_get_weekday(input_date: datetime.date, expected: bool) -> None:
+    assert_cell_operation_works(input_date, lambda cell: cell.dt.weekday(), expected)

tests/safeds/data/tabular/containers/_temporal_cell/test_year.py

@@ -0,0 +1,20 @@
+import datetime
+
+import pytest
+
+from tests.helpers import assert_cell_operation_works
+
+
+@pytest.mark.parametrize(
+    ("expected", "input_date"),
+    [
+        (2023, datetime.datetime(2023, 3, 9, 23, 29, 1, tzinfo=datetime.UTC)),
+        (2022, datetime.date(2022, 1, 1)),
+    ],
+    ids=[
+        "ISO datetime",
+        "ISO date",
+    ],
+)
+def test_get_year(input_date: datetime.date, expected: bool) -> None:
+    assert_cell_operation_works(input_date, lambda cell: cell.dt.year(), expected)