diff --git a/ironic_inspector/db.py b/ironic_inspector/db.py
index 2dcea12fc..d489e6f90 100644
--- a/ironic_inspector/db.py
+++ b/ironic_inspector/db.py
@@ -22,7 +22,7 @@ from oslo_db import options as db_opts
 from oslo_db.sqlalchemy import models
 from oslo_db.sqlalchemy import session as db_session
 from oslo_db.sqlalchemy import types as db_types
-from sqlalchemy import (Boolean, Column, DateTime, Enum, Float, ForeignKey,
+from sqlalchemy import (Boolean, Column, DateTime, Enum, ForeignKey,
                         Integer, String, Text)
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy import orm
@@ -56,8 +56,8 @@ class Node(Base):
     state = Column(Enum(*istate.States.all()), nullable=False,
                    default=istate.States.finished,
                    server_default=istate.States.finished)
-    started_at = Column(Float, nullable=True)
-    finished_at = Column(Float, nullable=True)
+    started_at = Column(DateTime, nullable=True)
+    finished_at = Column(DateTime, nullable=True)
     error = Column(Text, nullable=True)
 
     # version_id is being tracked in the NodeInfo object
diff --git a/ironic_inspector/main.py b/ironic_inspector/main.py
index fe3906458..b3dae5327 100644
--- a/ironic_inspector/main.py
+++ b/ironic_inspector/main.py
@@ -140,11 +140,14 @@ def generate_introspection_status(node):
     :param node: a NodeInfo instance
     :return: dictionary
     """
+    started_at = node.started_at.isoformat()
+    finished_at = node.finished_at.isoformat() if node.finished_at else None
+
     status = {}
     status['uuid'] = node.uuid
     status['finished'] = bool(node.finished_at)
-    status['started_at'] = utils.iso_timestamp(node.started_at)
-    status['finished_at'] = utils.iso_timestamp(node.finished_at)
+    status['started_at'] = started_at
+    status['finished_at'] = finished_at
     status['error'] = node.error
     status['links'] = create_link_object(
         ["v%s/introspection/%s" % (CURRENT_API_VERSION[0], node.uuid)])
diff --git a/ironic_inspector/migrations/versions/d00d6e3f38c4_change_created_finished_at_type.py b/ironic_inspector/migrations/versions/d00d6e3f38c4_change_created_finished_at_type.py
new file mode 100644
index 000000000..faa28376c
--- /dev/null
+++ b/ironic_inspector/migrations/versions/d00d6e3f38c4_change_created_finished_at_type.py
@@ -0,0 +1,68 @@
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+"""Change created|finished_at type to DateTime
+
+Revision ID: d00d6e3f38c4
+Revises: d2e48801c8ef
+Create Date: 2016-12-15 17:18:10.728695
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'd00d6e3f38c4'
+down_revision = 'd2e48801c8ef'
+branch_labels = None
+depends_on = None
+
+import datetime
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    started_at = sa.Column('started_at', sa.types.Float, nullable=True)
+    finished_at = sa.Column('finished_at', sa.types.Float, nullable=True)
+    temp_started_at = sa.Column("temp_started_at", sa.types.DateTime,
+                                nullable=True)
+    temp_finished_at = sa.Column("temp_finished_at", sa.types.DateTime,
+                                 nullable=True)
+
+    op.add_column("nodes", temp_started_at)
+    op.add_column("nodes", temp_finished_at)
+
+    t = sa.table('nodes', started_at, finished_at,
+                 temp_started_at, temp_finished_at)
+
+    conn = op.get_bind()
+    rows = conn.execute(sa.select([t.c.started_at, t.c.finished_at]))
+    for row in rows:
+        temp_started = datetime.datetime.utcfromtimestamp(row['started_at'])
+        temp_finished = row['finished_at']
+        # Note(milan) this is just a precaution; sa.null shouldn't happen here
+        if temp_finished is not None:
+            temp_finished = datetime.datetime.utcfromtimestamp(temp_finished)
+        conn.execute(t.update().values(
+            temp_started_at=temp_started, temp_finished_at=temp_finished))
+
+    with op.batch_alter_table('nodes') as batch_op:
+        batch_op.drop_column('started_at')
+        batch_op.drop_column('finished_at')
+        batch_op.alter_column('temp_started_at',
+                              existing_type=sa.types.DateTime,
+                              nullable=True,
+                              new_column_name='started_at')
+        batch_op.alter_column('temp_finished_at',
+                              existing_type=sa.types.DateTime,
+                              nullable=True,
+                              new_column_name='finished_at')
diff --git a/ironic_inspector/node_cache.py b/ironic_inspector/node_cache.py
index c5991df9b..10a29a114 100644
--- a/ironic_inspector/node_cache.py
+++ b/ironic_inspector/node_cache.py
@@ -15,9 +15,9 @@
 
 import contextlib
 import copy
+import datetime
 import json
 import six
-import time
 
 from automaton import exceptions as automaton_errors
 from ironicclient import exceptions
@@ -26,6 +26,7 @@ from oslo_config import cfg
 from oslo_db import exception as db_exc
 from oslo_db.sqlalchemy import utils as db_utils
 from oslo_utils import excutils
+from oslo_utils import timeutils
 from oslo_utils import uuidutils
 from sqlalchemy.orm import exc as orm_errors
 from sqlalchemy import text
@@ -278,7 +279,7 @@ class NodeInfo(object):
         """
         self.release_lock()
 
-        self.finished_at = time.time()
+        self.finished_at = timeutils.utcnow()
         self.error = error
 
         with db.ensure_transaction() as session:
@@ -670,7 +671,7 @@ def add_node(uuid, state, **attributes):
                        also ironic client instance may be passed under 'ironic'
     :returns: NodeInfo
     """
-    started_at = time.time()
+    started_at = timeutils.utcnow()
     with db.ensure_transaction() as session:
         _delete_node(uuid)
         db.Node(uuid=uuid, state=state, started_at=started_at).save(session)
@@ -840,8 +841,8 @@ def clean_up():
 
     :return: list of timed out node UUID's
     """
-    status_keep_threshold = (time.time() -
-                             CONF.node_status_keep_time)
+    status_keep_threshold = (timeutils.utcnow() - datetime.timedelta(
+                             seconds=CONF.node_status_keep_time))
 
     with db.ensure_transaction() as session:
         db.model_query(db.Node, session=session).filter(
@@ -851,7 +852,7 @@ def clean_up():
         timeout = CONF.timeout
         if timeout <= 0:
             return []
-        threshold = time.time() - timeout
+        threshold = timeutils.utcnow() - datetime.timedelta(seconds=timeout)
         uuids = [row.uuid for row in
                  db.model_query(db.Node.uuid, session=session).filter(
                      db.Node.started_at < threshold,
diff --git a/ironic_inspector/test/base.py b/ironic_inspector/test/base.py
index a83cc69fb..11dabdd35 100644
--- a/ironic_inspector/test/base.py
+++ b/ironic_inspector/test/base.py
@@ -11,6 +11,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import datetime
 
 import futurist
 import mock
@@ -159,8 +160,10 @@ class NodeTest(InventoryTest):
         self.node.to_dict = mock_to_dict
 
         self.ports = []
-        self.node_info = node_cache.NodeInfo(uuid=self.uuid, started_at=0,
-                                             node=self.node, ports=self.ports)
+        self.node_info = node_cache.NodeInfo(
+            uuid=self.uuid,
+            started_at=datetime.datetime(1, 1, 1),
+            node=self.node, ports=self.ports)
         self.node_info.node = mock.Mock(return_value=self.node)
 
 
diff --git a/ironic_inspector/test/unit/test_main.py b/ironic_inspector/test/unit/test_main.py
index 21df05b67..1b176a136 100644
--- a/ironic_inspector/test/unit/test_main.py
+++ b/ironic_inspector/test/unit/test_main.py
@@ -11,6 +11,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import datetime
 import json
 import ssl
 import sys
@@ -179,10 +180,11 @@ class GetStatusAPIBaseTest(BaseAPITest):
     def setUp(self):
         super(GetStatusAPIBaseTest, self).setUp()
         self.uuid2 = uuidutils.generate_uuid()
-        self.finished_node = node_cache.NodeInfo(uuid=self.uuid,
-                                                 started_at=42.0,
-                                                 finished_at=100.1,
-                                                 error='boom')
+        self.finished_node = node_cache.NodeInfo(
+            uuid=self.uuid,
+            started_at=datetime.datetime(1, 1, 1),
+            finished_at=datetime.datetime(1, 1, 2),
+            error='boom')
         self.finished_node.links = [
             {u'href': u'http://localhost/v1/introspection/%s' %
              self.finished_node.uuid,
@@ -190,25 +192,27 @@ class GetStatusAPIBaseTest(BaseAPITest):
         ]
         self.finished_node.status = {
             'finished': True,
-            'started_at': utils.iso_timestamp(self.finished_node.started_at),
-            'finished_at': utils.iso_timestamp(self.finished_node.finished_at),
+            'started_at': self.finished_node.started_at.isoformat(),
+            'finished_at': self.finished_node.finished_at.isoformat(),
             'error': self.finished_node.error,
             'uuid': self.finished_node.uuid,
             'links': self.finished_node.links
         }
 
-        self.unfinished_node = node_cache.NodeInfo(uuid=self.uuid2,
-                                                   started_at=42.0)
+        self.unfinished_node = node_cache.NodeInfo(
+            uuid=self.uuid2,
+            started_at=datetime.datetime(1, 1, 1))
         self.unfinished_node.links = [
             {u'href': u'http://localhost/v1/introspection/%s' %
              self.unfinished_node.uuid,
              u'rel': u'self'}
         ]
+        finished_at = (self.unfinished_node.finished_at.isoformat()
+                       if self.unfinished_node.finished_at else None)
         self.unfinished_node.status = {
             'finished': False,
-            'started_at': utils.iso_timestamp(self.unfinished_node.started_at),
-            'finished_at': utils.iso_timestamp(
-                self.unfinished_node.finished_at),
+            'started_at': self.unfinished_node.started_at.isoformat(),
+            'finished_at': finished_at,
             'error': None,
             'uuid': self.unfinished_node.uuid,
             'links': self.unfinished_node.links
diff --git a/ironic_inspector/test/unit/test_migrations.py b/ironic_inspector/test/unit/test_migrations.py
index e251075ec..88a18ec9c 100644
--- a/ironic_inspector/test/unit/test_migrations.py
+++ b/ironic_inspector/test/unit/test_migrations.py
@@ -24,6 +24,8 @@ The test will then use that db and u/p combo to run the tests.
 
 
 import contextlib
+import datetime
+import time
 
 import alembic
 from alembic import script
@@ -364,6 +366,35 @@ class MigrationCheckersMixin(object):
         err_node = nodes.select(nodes.c.uuid == err_node_id).execute().first()
         self.assertEqual(istate.States.error, err_node['state'])
 
+    def _pre_upgrade_d00d6e3f38c4(self, engine):
+        nodes = db_utils.get_table(engine, 'nodes')
+        for finished_at in (None, time.time()):
+            data = {'uuid': uuidutils.generate_uuid(),
+                    'started_at': time.time(),
+                    'finished_at': finished_at,
+                    'error': None}
+            nodes.insert().values(data).execute()
+        return data
+
+    def _check_d00d6e3f38c4(self, engine, data):
+        nodes = db_utils.get_table(engine, 'nodes')
+        col_names = [column.name for column in nodes.c]
+
+        self.assertIn('started_at', col_names)
+        self.assertIn('finished_at', col_names)
+        self.assertIsInstance(nodes.c.started_at.type,
+                              sqlalchemy.types.DateTime)
+        self.assertIsInstance(nodes.c.finished_at.type,
+                              sqlalchemy.types.DateTime)
+
+        node = nodes.select(nodes.c.uuid == data['uuid']).execute().first()
+        self.assertEqual(
+            datetime.datetime.utcfromtimestamp(data['started_at']),
+            node['started_at'])
+        self.assertEqual(
+            datetime.datetime.utcfromtimestamp(data['finished_at']),
+            node['finished_at'])
+
     def test_upgrade_and_version(self):
         with patch_with_engine(self.engine):
             self.migration_ext.upgrade('head')
diff --git a/ironic_inspector/test/unit/test_node_cache.py b/ironic_inspector/test/unit/test_node_cache.py
index 3ef8d1c48..605d372f3 100644
--- a/ironic_inspector/test/unit/test_node_cache.py
+++ b/ironic_inspector/test/unit/test_node_cache.py
@@ -12,15 +12,16 @@
 # limitations under the License.
 
 import copy
+import datetime
 import json
 import six
-import time
 import unittest
 
 import automaton
 import mock
 from oslo_config import cfg
 import oslo_db
+from oslo_utils import timeutils
 from oslo_utils import uuidutils
 
 from ironic_inspector.common import ironic as ir_utils
@@ -52,7 +53,10 @@ class TestNodeCache(test_base.NodeTest):
                                    mac=self.macs, bmc_address='1.2.3.4',
                                    foo=None)
         self.assertEqual(self.uuid, node.uuid)
-        self.assertTrue(time.time() - 60 < node.started_at < time.time() + 60)
+        self.assertTrue(
+            (datetime.datetime.utcnow() - datetime.timedelta(seconds=60)
+                < node.started_at <
+             datetime.datetime.utcnow() + datetime.timedelta(seconds=60)))
         self.assertFalse(node._locked)
 
         res = set(db.model_query(db.Node.uuid,
@@ -205,13 +209,19 @@ class TestNodeCacheFind(test_base.NodeTest):
     def test_bmc(self):
         res = node_cache.find_node(bmc_address='1.2.3.4')
         self.assertEqual(self.uuid, res.uuid)
-        self.assertTrue(time.time() - 60 < res.started_at < time.time() + 1)
+        self.assertTrue(
+            datetime.datetime.utcnow() - datetime.timedelta(seconds=60)
+            < res.started_at <
+            datetime.datetime.utcnow() + datetime.timedelta(seconds=1))
         self.assertTrue(res._locked)
 
     def test_macs(self):
         res = node_cache.find_node(mac=['11:22:33:33:33:33', self.macs[1]])
         self.assertEqual(self.uuid, res.uuid)
-        self.assertTrue(time.time() - 60 < res.started_at < time.time() + 1)
+        self.assertTrue(
+            datetime.datetime.utcnow() - datetime.timedelta(seconds=60)
+            < res.started_at <
+            datetime.datetime.utcnow() + datetime.timedelta(seconds=1))
         self.assertTrue(res._locked)
 
     def test_macs_not_found(self):
@@ -230,7 +240,10 @@ class TestNodeCacheFind(test_base.NodeTest):
         res = node_cache.find_node(bmc_address='1.2.3.4',
                                    mac=self.macs)
         self.assertEqual(self.uuid, res.uuid)
-        self.assertTrue(time.time() - 60 < res.started_at < time.time() + 1)
+        self.assertTrue(
+            datetime.datetime.utcnow() - datetime.timedelta(seconds=60)
+            < res.started_at <
+            datetime.datetime.utcnow() + datetime.timedelta(seconds=1))
         self.assertTrue(res._locked)
 
     def test_inconsistency(self):
@@ -245,7 +258,7 @@ class TestNodeCacheFind(test_base.NodeTest):
         session = db.get_session()
         with session.begin():
             (db.model_query(db.Node).filter_by(uuid=self.uuid).
-                update({'finished_at': 42.0}))
+                update({'finished_at': datetime.datetime.utcnow()}))
         self.assertRaises(utils.Error, node_cache.find_node,
                           bmc_address='1.2.3.4')
 
@@ -253,7 +266,7 @@ class TestNodeCacheFind(test_base.NodeTest):
 class TestNodeCacheCleanUp(test_base.NodeTest):
     def setUp(self):
         super(TestNodeCacheCleanUp, self).setUp()
-        self.started_at = 100.0
+        self.started_at = datetime.datetime.utcnow()
         session = db.get_session()
         with session.begin():
             db.Node(uuid=self.uuid,
@@ -280,9 +293,9 @@ class TestNodeCacheCleanUp(test_base.NodeTest):
         self.assertEqual(1, db.model_query(db.Option).count())
 
     @mock.patch.object(node_cache, '_get_lock', autospec=True)
-    @mock.patch.object(time, 'time')
+    @mock.patch.object(timeutils, 'utcnow')
     def test_ok(self, time_mock, get_lock_mock):
-        time_mock.return_value = 1000
+        time_mock.return_value = datetime.datetime.utcnow()
 
         self.assertFalse(node_cache.clean_up())
 
@@ -295,29 +308,31 @@ class TestNodeCacheCleanUp(test_base.NodeTest):
         self.assertFalse(get_lock_mock.called)
 
     @mock.patch.object(node_cache, '_get_lock', autospec=True)
-    @mock.patch.object(time, 'time')
+    @mock.patch.object(timeutils, 'utcnow')
     def test_timeout(self, time_mock, get_lock_mock):
         # Add a finished node to confirm we don't try to timeout it
         time_mock.return_value = self.started_at
         session = db.get_session()
+        finished_at = self.started_at + datetime.timedelta(seconds=60)
         with session.begin():
-            db.Node(uuid=self.uuid + '1',
+            db.Node(uuid=self.uuid + '1', started_at=self.started_at,
                     state=istate.States.waiting,
-                    started_at=self.started_at,
-                    finished_at=self.started_at + 60).save(session)
+                    finished_at=finished_at).save(session)
         CONF.set_override('timeout', 99)
-        time_mock.return_value = (self.started_at + 100)
+        time_mock.return_value = (self.started_at +
+                                  datetime.timedelta(seconds=100))
 
         self.assertEqual([self.uuid], node_cache.clean_up())
 
         res = [(row.state, row.finished_at, row.error) for row in
                db.model_query(db.Node).all()]
-        self.assertEqual([(istate.States.error,
-                           self.started_at + 100,
-                           'Introspection timeout'),
-                          (istate.States.waiting,
-                           self.started_at + 60, None)],
-                         res)
+        self.assertEqual(
+            [(istate.States.error,
+              self.started_at + datetime.timedelta(seconds=100),
+              'Introspection timeout'),
+             (istate.States.waiting,
+              self.started_at + datetime.timedelta(seconds=60), None)],
+            res)
         self.assertEqual([], db.model_query(db.Attribute).all())
         self.assertEqual([], db.model_query(db.Option).all())
         get_lock_mock.assert_called_once_with(self.uuid)
@@ -328,7 +343,8 @@ class TestNodeCacheCleanUp(test_base.NodeTest):
         session = db.get_session()
         with session.begin():
             db.model_query(db.Node).update(
-                {'finished_at': time.time() - 100})
+                {'finished_at': (datetime.datetime.utcnow() -
+                                 datetime.timedelta(seconds=100))})
 
         self.assertEqual([], node_cache.clean_up())
 
@@ -337,7 +353,8 @@ class TestNodeCacheCleanUp(test_base.NodeTest):
 
 class TestNodeCacheGetNode(test_base.NodeTest):
     def test_ok(self):
-        started_at = time.time() - 42
+        started_at = (datetime.datetime.utcnow() -
+                      datetime.timedelta(seconds=42))
         session = db.get_session()
         with session.begin():
             db.Node(uuid=self.uuid,
@@ -352,7 +369,8 @@ class TestNodeCacheGetNode(test_base.NodeTest):
         self.assertFalse(info._locked)
 
     def test_locked(self):
-        started_at = time.time() - 42
+        started_at = (datetime.datetime.utcnow() -
+                      datetime.timedelta(seconds=42))
         session = db.get_session()
         with session.begin():
             db.Node(uuid=self.uuid,
@@ -371,7 +389,8 @@ class TestNodeCacheGetNode(test_base.NodeTest):
                           uuidutils.generate_uuid())
 
     def test_with_name(self):
-        started_at = time.time() - 42
+        started_at = (datetime.datetime.utcnow() -
+                      datetime.timedelta(seconds=42))
         session = db.get_session()
         with session.begin():
             db.Node(uuid=self.uuid,
@@ -390,7 +409,7 @@ class TestNodeCacheGetNode(test_base.NodeTest):
         ironic.node.get.assert_called_once_with('name')
 
 
-@mock.patch.object(time, 'time', lambda: 42.0)
+@mock.patch.object(timeutils, 'utcnow', lambda: datetime.datetime(1, 1, 1))
 class TestNodeInfoFinished(test_base.NodeTest):
     def setUp(self):
         super(TestNodeInfoFinished, self).setUp()
@@ -398,7 +417,8 @@ class TestNodeInfoFinished(test_base.NodeTest):
                             istate.States.processing,
                             bmc_address='1.2.3.4',
                             mac=self.macs)
-        self.node_info = node_cache.NodeInfo(uuid=self.uuid, started_at=3.14)
+        self.node_info = node_cache.NodeInfo(
+            uuid=self.uuid, started_at=datetime.datetime(3, 1, 4))
         session = db.get_session()
         with session.begin():
             db.Option(uuid=self.uuid, name='foo', value='bar').save(
@@ -409,7 +429,7 @@ class TestNodeInfoFinished(test_base.NodeTest):
 
         session = db.get_session()
         with session.begin():
-            self.assertEqual((42.0, None),
+            self.assertEqual((datetime.datetime(1, 1, 1), None),
                              tuple(db.model_query(
                                    db.Node.finished_at,
                                    db.Node.error).first()))
@@ -421,7 +441,7 @@ class TestNodeInfoFinished(test_base.NodeTest):
     def test_error(self):
         self.node_info.finished(error='boom')
 
-        self.assertEqual((42.0, 'boom'),
+        self.assertEqual((datetime.datetime(1, 1, 1), 'boom'),
                          tuple(db.model_query(db.Node.finished_at,
                                db.Node.error).first()))
         self.assertEqual([], db.model_query(db.Attribute).all())
@@ -772,9 +792,10 @@ class TestNodeCacheListNode(test_base.NodeTest):
         self.uuid2 = uuidutils.generate_uuid()
         session = db.get_session()
         with session.begin():
-            db.Node(uuid=self.uuid, started_at=42.42).save(session)
-            db.Node(uuid=self.uuid2, started_at=42.24,
-                    finished_at=100.0).save(session)
+            db.Node(uuid=self.uuid,
+                    started_at=datetime.datetime(1, 1, 2)).save(session)
+            db.Node(uuid=self.uuid2, started_at=datetime.datetime(1, 1, 1),
+                    finished_at=datetime.datetime(1, 1, 3)).save(session)
 
     # mind please node(self.uuid).started_at > node(self.uuid2).started_at
     # and the result ordering is strict in node_cache.get_node_list newer first
@@ -848,7 +869,7 @@ class TestNodeInfoState(test_base.NodeStateTest):
                               self.node_info._set_state, 'foo')
 
     def test_commit(self):
-        current_time = time.time()
+        current_time = timeutils.utcnow()
         self.node_info.started_at = self.node_info.finished_at = current_time
         self.node_info.error = "Boo!"
         self.node_info.commit()
diff --git a/ironic_inspector/test/unit/test_process.py b/ironic_inspector/test/unit/test_process.py
index 1a17353d6..ff2bf2936 100644
--- a/ironic_inspector/test/unit/test_process.py
+++ b/ironic_inspector/test/unit/test_process.py
@@ -17,7 +17,6 @@ import json
 import os
 import shutil
 import tempfile
-import time
 
 import eventlet
 import fixtures
@@ -25,6 +24,7 @@ from ironicclient import exceptions
 import mock
 from oslo_config import cfg
 from oslo_serialization import base64
+from oslo_utils import timeutils
 from oslo_utils import uuidutils
 
 from ironic_inspector.common import ironic as ir_utils
@@ -44,7 +44,7 @@ CONF = cfg.CONF
 class BaseTest(test_base.NodeTest):
     def setUp(self):
         super(BaseTest, self).setUp()
-        self.started_at = time.time()
+        self.started_at = timeutils.utcnow()
         self.all_ports = [mock.Mock(uuid=uuidutils.generate_uuid(),
                                     address=mac) for mac in self.macs]
         self.ports = [self.all_ports[1]]
@@ -120,7 +120,7 @@ class TestProcess(BaseProcessTest):
         self.node_info.finished.assert_called_once_with(error=mock.ANY)
 
     def test_already_finished(self):
-        self.node_info.finished_at = time.time()
+        self.node_info.finished_at = timeutils.utcnow()
         self.assertRaisesRegex(utils.Error, 'already finished',
                                process.process, self.data)
         self.assertFalse(self.process_mock.called)
diff --git a/releasenotes/notes/change_started_finished_at_type_to_datetime-c5617e598350970c.yaml b/releasenotes/notes/change_started_finished_at_type_to_datetime-c5617e598350970c.yaml
new file mode 100644
index 000000000..99f4fb64d
--- /dev/null
+++ b/releasenotes/notes/change_started_finished_at_type_to_datetime-c5617e598350970c.yaml
@@ -0,0 +1,11 @@
+---
+fixes:
+  - |
+    DB's columns started_at and finished_at are defined as float type,
+    as result timestamp doesn't fit into default Float size. This change
+    migrates columns type to DateTime.
+upgrade:
+  - |
+    New migration from Float to DateTime consists data migration,
+    which could take some time, based on the number of introspection
+    statuses in DB.