diff --git a/app/schema_validation/__init__.py b/app/schema_validation/__init__.py
index b530a17b0..2dff49519 100644
--- a/app/schema_validation/__init__.py
+++ b/app/schema_validation/__init__.py
@@ -1,5 +1,5 @@
 import json
-from datetime import datetime
+from datetime import datetime, timedelta
 
 from jsonschema import (Draft4Validator, ValidationError, FormatChecker)
 from notifications_utils.recipients import (validate_phone_number, validate_email_address, InvalidPhoneError,
@@ -25,7 +25,11 @@ def validate(json_to_validate, schema):
     def validate_schema_date_with_hour(instance):
         if isinstance(instance, str):
             try:
-                datetime.strptime(instance, "%Y-%m-%d %H:%M")
+                dt = datetime.strptime(instance, "%Y-%m-%d %H:%M")
+                if dt < datetime.utcnow():
+                    raise ValidationError("datetime can not be in the past")
+                if dt > datetime.utcnow() + timedelta(hours=24):
+                    raise ValidationError("datetime can only be 24 hours in the future")
             except ValueError as e:
                 raise ValidationError("datetime format is invalid. Use the format: "
                                       "YYYY-MM-DD HH:MI, for example 2017-05-30 13:15")
diff --git a/tests/app/v2/notifications/test_notification_schemas.py b/tests/app/v2/notifications/test_notification_schemas.py
index 90139c7c2..bbccd81d5 100644
--- a/tests/app/v2/notifications/test_notification_schemas.py
+++ b/tests/app/v2/notifications/test_notification_schemas.py
@@ -2,6 +2,7 @@ import uuid
 
 import pytest
 from flask import json
+from freezegun import freeze_time
 from jsonschema import ValidationError
 
 from app.v2.notifications.notification_schemas import (
@@ -357,6 +358,7 @@ def test_get_notifications_response_with_email_and_phone_number():
 
 @pytest.mark.parametrize("schema",
                          [post_email_request_schema, post_sms_request_schema])
+@freeze_time("2017-05-12 13:00:00")
 def test_post_schema_valid_scheduled_for(schema):
     j = {"template_id": str(uuid.uuid4()),
          "email_address": "joe@gmail.com",
@@ -386,3 +388,29 @@ def test_post_email_schema_invalid_scheduled_for(invalid_datetime, schema):
     assert error['errors'] == [{'error': 'ValidationError',
                                 'message': "scheduled_for datetime format is invalid. Use the format: "
                                            "YYYY-MM-DD HH:MI, for example 2017-05-30 13:15"}]
+
+
+@freeze_time("2017-05-12 13:00:00")
+def test_scheduled_for_raises_validation_error_when_in_the_past():
+    j = {"phone_number": "07515111111",
+         "template_id": str(uuid.uuid4()),
+         "scheduled_for": "2017-05-12 10:00"}
+    with pytest.raises(ValidationError) as e:
+        validate(j, post_sms_request_schema)
+    error = json.loads(str(e.value))
+    assert error['status_code'] == 400
+    assert error['errors'] == [{'error': 'ValidationError',
+                                'message': "scheduled_for datetime can not be in the past"}]
+
+
+@freeze_time("2017-05-12 13:00:00")
+def test_scheduled_for_raises_validation_error_when_more_than_24_hours_in_the_future():
+    j = {"phone_number": "07515111111",
+         "template_id": str(uuid.uuid4()),
+         "scheduled_for": "2017-05-13 14:00"}
+    with pytest.raises(ValidationError) as e:
+        validate(j, post_sms_request_schema)
+    error = json.loads(str(e.value))
+    assert error['status_code'] == 400
+    assert error['errors'] == [{'error': 'ValidationError',
+                                'message': "scheduled_for datetime can only be 24 hours in the future"}]
diff --git a/tests/app/v2/notifications/test_post_notifications.py b/tests/app/v2/notifications/test_post_notifications.py
index 114e2e8aa..305d224b8 100644
--- a/tests/app/v2/notifications/test_post_notifications.py
+++ b/tests/app/v2/notifications/test_post_notifications.py
@@ -2,6 +2,7 @@ import uuid
 
 import pytest
 from flask import json
+from freezegun import freeze_time
 
 from app.models import Notification, ScheduledNotification
 from app.v2.errors import RateLimitError
@@ -353,6 +354,7 @@ def test_post_sms_should_persist_supplied_sms_number(client, sample_template_wit
 @pytest.mark.parametrize("notification_type, key_send_to, send_to",
                          [("sms", "phone_number", "07700 900 855"),
                           ("email", "email_address", "sample@email.com")])
+@freeze_time("2017-05-14 14:00:00")
 def test_post_notification_with_scheduled_for(client, sample_template, sample_email_template,
                                               notification_type, key_send_to, send_to):
     data = {