diff --git a/CHANGELOG.md b/CHANGELOG.md
index 05e7e5c98..99a085b4c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,14 @@
 # Changelog
 
-### 41.4.7 [#1212](https://github.com/openfisca/openfisca-core/pull/1212)
+## 41.5.0 [#1212](https://github.com/openfisca/openfisca-core/pull/1212)
+
+#### New features
+
+- Introduce `VectorialAsofDateParameterNodeAtInstant`
+  - It is a parameter node of the legislation at a given instant which has been vectorized along some date.
+   - Vectorized parameters allow requests such as parameters.housing_benefit[date], where date is a `numpy.datetime64` vector
+
+### 41.4.7 [#1211](https://github.com/openfisca/openfisca-core/pull/1211)
 
 #### Technical changes
 
diff --git a/openfisca_core/parameters/__init__.py b/openfisca_core/parameters/__init__.py
index a5ac18044..33a1f06c6 100644
--- a/openfisca_core/parameters/__init__.py
+++ b/openfisca_core/parameters/__init__.py
@@ -41,6 +41,7 @@
 from .parameter_scale_bracket import ParameterScaleBracket
 from .parameter_scale_bracket import ParameterScaleBracket as Bracket
 from .values_history import ValuesHistory
+from .vectorial_asof_date_parameter_node_at_instant import VectorialAsofDateParameterNodeAtInstant
 from .vectorial_parameter_node_at_instant import VectorialParameterNodeAtInstant
 
 __all__ = [
@@ -63,5 +64,6 @@
     "ParameterScaleBracket",
     "Bracket",
     "ValuesHistory",
+    "VectorialAsofDateParameterNodeAtInstant",
     "VectorialParameterNodeAtInstant",
 ]
diff --git a/openfisca_core/parameters/parameter_node_at_instant.py b/openfisca_core/parameters/parameter_node_at_instant.py
index 9dc0abee8..40317f584 100644
--- a/openfisca_core/parameters/parameter_node_at_instant.py
+++ b/openfisca_core/parameters/parameter_node_at_instant.py
@@ -41,6 +41,10 @@ def __getattr__(self, key):
     def __getitem__(self, key):
         # If fancy indexing is used, cast to a vectorial node
         if isinstance(key, numpy.ndarray):
+            # If fancy indexing is used wit a datetime64, cast to a vectorial node supporting datetime64
+            if numpy.issubdtype(key.dtype, numpy.datetime64):
+                return parameters.VectorialAsofDateParameterNodeAtInstant.build_from_node(self)[key]
+
             return parameters.VectorialParameterNodeAtInstant.build_from_node(self)[key]
         return self._children[key]
 
diff --git a/openfisca_core/parameters/vectorial_asof_date_parameter_node_at_instant.py b/openfisca_core/parameters/vectorial_asof_date_parameter_node_at_instant.py
new file mode 100644
index 000000000..8b7dd0fdd
--- /dev/null
+++ b/openfisca_core/parameters/vectorial_asof_date_parameter_node_at_instant.py
@@ -0,0 +1,66 @@
+import numpy
+
+from openfisca_core.parameters.parameter_node_at_instant import ParameterNodeAtInstant
+from openfisca_core.parameters.vectorial_parameter_node_at_instant import VectorialParameterNodeAtInstant
+
+
+class VectorialAsofDateParameterNodeAtInstant(VectorialParameterNodeAtInstant):
+    """
+    Parameter node of the legislation at a given instant which has been vectorized along some date.
+    Vectorized parameters allow requests such as parameters.housing_benefit[date], where date is a np.datetime64 type vector
+    """
+
+    @staticmethod
+    def build_from_node(node):
+        VectorialParameterNodeAtInstant.check_node_vectorisable(node)
+        subnodes_name = node._children.keys()
+        # Recursively vectorize the children of the node
+        vectorial_subnodes = tuple([
+            VectorialAsofDateParameterNodeAtInstant.build_from_node(node[subnode_name]).vector
+            if isinstance(node[subnode_name], ParameterNodeAtInstant)
+            else node[subnode_name]
+            for subnode_name in subnodes_name
+        ])
+        # A vectorial node is a wrapper around a numpy recarray
+        # We first build the recarray
+        recarray = numpy.array(
+            [vectorial_subnodes],
+            dtype=[
+                (subnode_name, subnode.dtype if isinstance(subnode, numpy.recarray) else 'float')
+                for (subnode_name, subnode) in zip(subnodes_name, vectorial_subnodes)
+            ]
+        )
+        return VectorialAsofDateParameterNodeAtInstant(node._name, recarray.view(numpy.recarray), node._instant_str)
+
+    def __getitem__(self, key):
+        # If the key is a string, just get the subnode
+        if isinstance(key, str):
+            key = numpy.array([key], dtype='datetime64[D]')
+            return self.__getattr__(key)
+        # If the key is a vector, e.g. ['1990-11-25', '1983-04-17', '1969-09-09']
+        elif isinstance(key, numpy.ndarray):
+            assert numpy.issubdtype(key.dtype, numpy.datetime64)
+            names = list(self.dtype.names)  # Get all the names of the subnodes, e.g. ['before_X', 'after_X', 'after_Y']
+            values = numpy.asarray([value for value in self.vector[0]])
+            names = [
+                name
+                for name in names
+                if not name.startswith("before")
+            ]
+            names = [
+                numpy.datetime64(
+                    "-".join(name[len("after_"):].split("_"))
+                )
+                for name in names
+            ]
+            conditions = sum([
+                name <= key
+                for name in names
+            ])
+            result = values[conditions]
+
+            # If the result is not a leaf, wrap the result in a vectorial node.
+            if numpy.issubdtype(result.dtype, numpy.record) or numpy.issubdtype(result.dtype, numpy.void):
+                return VectorialAsofDateParameterNodeAtInstant(self._name, result.view(numpy.recarray), self._instant_str)
+
+            return result
diff --git a/setup.py b/setup.py
index 8135f9d88..ceb862e0d 100644
--- a/setup.py
+++ b/setup.py
@@ -66,7 +66,7 @@
 
 setup(
     name="OpenFisca-Core",
-    version="41.4.7",
+    version="41.5.0",
     author="OpenFisca Team",
     author_email="contact@openfisca.org",
     classifiers=[
diff --git a/tests/core/parameters_date_indexing/__init__.py b/tests/core/parameters_date_indexing/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/core/parameters_date_indexing/full_rate_age.yaml b/tests/core/parameters_date_indexing/full_rate_age.yaml
new file mode 100644
index 000000000..fa9377fec
--- /dev/null
+++ b/tests/core/parameters_date_indexing/full_rate_age.yaml
@@ -0,0 +1,121 @@
+description: Full rate age
+full_rate_age_by_birthdate:
+  description: Full rate age by birthdate
+  before_1951_07_01:
+    description: Born before 01/07/1951
+    year:
+      description: Year
+      values:
+        1983-04-01:
+          value: 65.0
+    month:
+      description: Month
+      values:
+        1983-04-01:
+          value: 0.0
+  after_1951_07_01:
+    description: Born after 01/07/1951
+    year:
+      description: Year
+      values:
+        2011-07-01:
+          value: 65.0
+        1983-04-01:
+          value: null
+    month:
+      description: Month
+      values:
+        2011-07-01:
+          value: 4.0
+        1983-04-01:
+          value: null
+  after_1952_01_01:
+    description: Born after 01/01/1952
+    year:
+      description: Year
+      values:
+        2011-07-01:
+          value: 65.0
+        1983-04-01:
+          value: null
+    month:
+      description: Month
+      values:
+        2012-01-01:
+          value: 9.0
+        2011-07-01:
+          value: 8.0
+        1983-04-01:
+          value: null
+  after_1953_01_01:
+    description: Born after 01/01/1953
+    year:
+      description: Year
+      values:
+        2011-07-01:
+          value: 66.0
+        1983-04-01:
+          value: null
+    month:
+      description: Month
+      values:
+        2012-01-01:
+          value: 2.0
+        2011-07-01:
+          value: 0.0
+        1983-04-01:
+          value: null
+  after_1954_01_01:
+    description: Born after 01/01/1954
+    year:
+      description: Year
+      values:
+        2011-07-01:
+          value: 66.0
+        1983-04-01:
+          value: null
+    month:
+      description: Month
+      values:
+        2012-01-01:
+          value: 7.0
+        2011-07-01:
+          value: 4.0
+        1983-04-01:
+          value: null
+  after_1955_01_01:
+    description: Born after 01/01/1955
+    year:
+      description: Year
+      values:
+        2012-01-01:
+          value: 67.0
+        2011-07-01:
+          value: 66.0
+        1983-04-01:
+          value: null
+    month:
+      description: Month
+      values:
+        2012-01-01:
+          value: 0.0
+        2011-07-01:
+          value: 8.0
+        1983-04-01:
+          value: null
+  after_1956_01_01:
+    description: Born after 01/01/1956
+    year:
+      description: Year
+      values:
+        2011-07-01:
+          value: 67.0
+        1983-04-01:
+          value: null
+    month:
+      description: Month
+      values:
+        2011-07-01:
+          value: 0.0
+        1983-04-01:
+          value: null
diff --git a/tests/core/parameters_date_indexing/full_rate_required_duration.yml b/tests/core/parameters_date_indexing/full_rate_required_duration.yml
new file mode 100644
index 000000000..af394ec56
--- /dev/null
+++ b/tests/core/parameters_date_indexing/full_rate_required_duration.yml
@@ -0,0 +1,162 @@
+description: Required contribution duration for full rate
+contribution_quarters_required_by_birthdate:
+  description: Contribution quarters required by birthdate
+  before_1934_01_01:
+    description: before 1934
+    values:
+      1983-01-01:
+        value: 150.0
+  after_1934_01_01:
+    description: '1934-01-01'
+    values:
+      1994-01-01:
+        value: 151.0
+      1983-01-01:
+        value: null
+  after_1935_01_01:
+    description: '1935-01-01'
+    values:
+      1994-01-01:
+        value: 152.0
+      1983-01-01:
+        value: null
+  after_1936_01_01:
+    description: '1936-01-01'
+    values:
+      1994-01-01:
+        value: 153.0
+      1983-01-01:
+        value: null
+  after_1937_01_01:
+    description: '1937-01-01'
+    values:
+      1994-01-01:
+        value: 154.0
+      1983-01-01:
+        value: null
+  after_1938_01_01:
+    description: '1938-01-01'
+    values:
+      1994-01-01:
+        value: 155.0
+      1983-01-01:
+        value: null
+  after_1939_01_01:
+    description: '1939-01-01'
+    values:
+      1994-01-01:
+        value: 156.0
+      1983-01-01:
+        value: null
+  after_1940_01_01:
+    description: '1940-01-01'
+    values:
+      1994-01-01:
+        value: 157.0
+      1983-01-01:
+        value: null
+  after_1941_01_01:
+    description: '1941-01-01'
+    values:
+      1994-01-01:
+        value: 158.0
+      1983-01-01:
+        value: null
+  after_1942_01_01:
+    description: '1942-01-01'
+    values:
+      1994-01-01:
+        value: 159.0
+      1983-01-01:
+        value: null
+  after_1943_01_01:
+    description: '1943-01-01'
+    values:
+      1994-01-01:
+        value: 160.0
+      1983-01-01:
+        value: null
+  after_1949_01_01:
+    description: '1949-01-01'
+    values:
+      2009-01-01:
+        value: 161.0
+      1983-01-01:
+        value: null
+  after_1950_01_01:
+    description: '1950-01-01'
+    values:
+      2009-01-01:
+        value: 162.0
+      1983-01-01:
+        value: null
+  after_1951_01_01:
+    description: '1951-01-01'
+    values:
+      2009-01-01:
+        value: 163.0
+      1983-01-01:
+        value: null
+  after_1952_01_01:
+    description: '1952-01-01'
+    values:
+      2009-01-01:
+        value: 164.0
+      1983-01-01:
+        value: null
+  after_1953_01_01:
+    description: '1953-01-01'
+    values:
+      2012-01-01:
+        value: 165.0
+      1983-01-01:
+        value: null
+  after_1955_01_01:
+    description: '1955-01-01'
+    values:
+      2013-01-01:
+        value: 166.0
+      1983-01-01:
+        value: null
+  after_1958_01_01:
+    description: '1958-01-01'
+    values:
+      2015-01-01:
+        value: 167.0
+      1983-01-01:
+        value: null
+  after_1961_01_01:
+    description: '1961-01-01'
+    values:
+      2015-01-01:
+        value: 168.0
+      1983-01-01:
+        value: null
+  after_1964_01_01:
+    description: '1964-01-01'
+    values:
+      2015-01-01:
+        value: 169.0
+      1983-01-01:
+        value: null
+  after_1967_01_01:
+    description: '1967-01-01'
+    values:
+      2015-01-01:
+        value: 170.0
+      1983-01-01:
+        value: null
+  after_1970_01_01:
+    description: '1970-01-01'
+    values:
+      2015-01-01:
+        value: 171.0
+      1983-01-01:
+        value: null
+  after_1973_01_01:
+    description: '1973-01-01'
+    values:
+      2015-01-01:
+        value: 172.0
+      1983-01-01:
+        value: null
diff --git a/tests/core/parameters_date_indexing/test_date_indexing.py b/tests/core/parameters_date_indexing/test_date_indexing.py
new file mode 100644
index 000000000..1b19c72ba
--- /dev/null
+++ b/tests/core/parameters_date_indexing/test_date_indexing.py
@@ -0,0 +1,38 @@
+import numpy
+import os
+
+
+from openfisca_core.tools import assert_near
+from openfisca_core.parameters import ParameterNode
+from openfisca_core.model_api import *  # noqa
+
+LOCAL_DIR = os.path.dirname(os.path.abspath(__file__))
+
+parameters = ParameterNode(directory_path=LOCAL_DIR)
+
+
+def get_message(error):
+    return error.args[0]
+
+
+def test_on_leaf():
+    parameter_at_instant = parameters.full_rate_required_duration('1995-01-01')
+    birthdate = numpy.array(['1930-01-01', '1935-01-01', '1940-01-01', '1945-01-01'], dtype='datetime64[D]')
+    assert_near(parameter_at_instant.contribution_quarters_required_by_birthdate[birthdate], [150, 152, 157, 160])
+
+
+def test_on_node():
+    birthdate = numpy.array(['1950-01-01', '1953-01-01', '1956-01-01', '1959-01-01'], dtype='datetime64[D]')
+    parameter_at_instant = parameters.full_rate_age('2012-03-01')
+    node = parameter_at_instant.full_rate_age_by_birthdate[birthdate]
+    assert_near(node.year, [65, 66, 67, 67])
+    assert_near(node.month, [0, 2, 0, 0])
+
+
+# def test_inhomogenous():
+#     birthdate = numpy.array(['1930-01-01', '1935-01-01', '1940-01-01', '1945-01-01'], dtype = 'datetime64[D]')
+#     parameter_at_instant = parameters..full_rate_age('2011-01-01')
+#     parameter_at_instant.full_rate_age_by_birthdate[birthdate]
+#     with pytest.raises(ValueError) as error:
+#         parameter_at_instant.full_rate_age_by_birthdate[birthdate]
+#     assert "Cannot use fancy indexing on parameter node '.full_rate_age.full_rate_age_by_birthdate'" in get_message(error.value)
diff --git a/tests/core/parameters_fancy_indexing/coefficient_de_minoration.yaml b/tests/core/parameters_fancy_indexing/coefficient_de_minoration.yaml
new file mode 100644
index 000000000..9894ae64a
--- /dev/null
+++ b/tests/core/parameters_fancy_indexing/coefficient_de_minoration.yaml
@@ -0,0 +1,135 @@
+description: Coefficient de minoration ARRCO
+coefficient_minoration_en_fonction_distance_age_annulation_decote_en_annee:
+  description: Coefficient de minoration à l'Arrco en fonction de la distance à l'âge d'annulation de la décote (en année)
+  '-10':
+    description: '-10'
+    values:
+      1965-01-01:
+        value: 0.43
+      1957-05-15:
+        value: null
+  '-9':
+    description: '-9'
+    values:
+      1965-01-01:
+        value: 0.5
+      1957-05-15:
+        value: null
+  '-8':
+    description: '-8'
+    values:
+      1965-01-01:
+        value: 0.57
+      1957-05-15:
+        value: null
+  '-7':
+    description: '-7'
+    values:
+      1965-01-01:
+        value: 0.64
+      1957-05-15:
+        value: null
+  '-6':
+    description: '-6'
+    values:
+      1965-01-01:
+        value: 0.71
+      1957-05-15:
+        value: null
+  '-5':
+    description: '-5'
+    values:
+      1965-01-01:
+        value: 0.78
+      1957-05-15:
+        value: 0.75
+  '-4':
+    description: '-4'
+    values:
+      1965-01-01:
+        value: 0.83
+      1957-05-15:
+        value: 0.8
+  '-3':
+    description: '-3'
+    values:
+      1965-01-01:
+        value: 0.88
+      1957-05-15:
+        value: 0.85
+  '-2':
+    description: '-2'
+    values:
+      1965-01-01:
+        value: 0.92
+      1957-05-15:
+        value: 0.9
+  '-1':
+    description: '-1'
+    values:
+      1965-01-01:
+        value: 0.96
+      1957-05-15:
+        value: 0.95
+  '0':
+    description: '0'
+    values:
+      1965-01-01:
+        value: 1.0
+      1957-05-15:
+        value: 1.05
+  '1':
+    description: '1'
+    values:
+      1965-01-01:
+        value: null
+      1957-05-15:
+        value: 1.1
+  '2':
+    description: '2'
+    values:
+      1965-01-01:
+        value: null
+      1957-05-15:
+        value: 1.15
+  '3':
+    description: '3'
+    values:
+      1965-01-01:
+        value: null
+      1957-05-15:
+        value: 1.2
+  '4':
+    description: '4'
+    values:
+      1965-01-01:
+        value: null
+      1957-05-15:
+        value: 1.25
+  metadata:
+    order:
+    - '-10'
+    - '-9'
+    - '-8'
+    - '-7'
+    - '-6'
+    - '-5'
+    - '-4'
+    - '-3'
+    - '-2'
+    - '-1'
+    - '0'
+    - '1'
+    - '2'
+    - '3'
+    - '4'
+metadata:
+  order:
+  - coefficient_minoration_en_fonction_distance_age_annulation_decote_en_annee
+  reference:
+    1965-01-01: Article 18 de l'annexe A de l'Accord national interprofessionnel de retraite complémentaire du 8 décembre 1961
+    1957-05-15: Accord du 15/05/1957 pour la création de l'UNIRS
+  description_en: Penalty for early retirement ARRCO
+documentation: |
+  Note: Le coefficient d'abattement (ou de majoration avant 1965) constitue une multiplication des droits de pension à l'arrco par le coefficient en question. Par exemple, un individu partant en retraite à 60 ans en 1960 touchait 75% de sa pension. A partir de 1983, une double condition d'âge et de durée d'assurance est instaurée: un individu ayant validé une durée égale à la durée d'assurance cible(voir onglet Trim_tx_plein_RG) partira sans abbattement, même s'il n'a pas atteint l'âge d'annulation de la décôte dans le régime général (voir onglet Age_ann_dec_RG).
+  Note : le coefficient de minoration est linéaire en nombre de trimestres, e.g. il est de 0,43 à AAD - 10 ans, de 0,4475 à AAD - 9 ans et 3 trimestres, de 0,465 à AAD - 9 ans et 2 trimestres, etc.