Added datetime scalar

graphene/new_types/datetime.py

@@ -0,0 +1,39 @@
+from __future__ import absolute_import
+
+import datetime
+
+from graphql.language import ast
+
+from .scalars import Scalar
+
+try:
+    import iso8601
+except:
+    raise ImportError(
+        "iso8601 package is required for DateTime Scalar.\n"
+        "You can install it using: pip install iso8601."
+    )
+
+
+class DateTime(Scalar):
+    '''
+    The `DateTime` scalar type represents a DateTime
+    value as specified by
+    [iso8601](https://en.wikipedia.org/wiki/ISO_8601).
+    '''
+
+    @staticmethod
+    def serialize(dt):
+        assert isinstance(dt, (datetime.datetime, datetime.date)), (
+            'Received not compatible datetime "{}"'.format(repr(dt))
+        )
+        return dt.isoformat()
+
+    @staticmethod
+    def parse_literal(node):
+        if isinstance(node, ast.StringValue):
+            return iso8601.parse_date(node.value)
+
+    @staticmethod
+    def parse_value(value):
+        return datetime.datetime.strptime(value, "%Y-%m-%dT%H:%M:%S.%f")