Added DateTime scalar

graphene/types/datetime.py

@@ -0,0 +1,27 @@
+from __future__ import absolute_import
+
+import datetime
+try:
+    import iso8601
+except:
+    raise ImportError("iso8601 package is required for DateTime Scalar.\nYou can install it using: pip install iso8601.")
+from graphql.language import ast
+
+from .scalars import Scalar
+
+
+class DateTime(Scalar):
+
+    @staticmethod
+    def serialize(dt):
+        assert isinstance(dt, datetime.datetime)
+        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")