diff --git a/apiserver/bll/workers/stats.py b/apiserver/bll/workers/stats.py
index eab81a2..c6bd8d9 100644
--- a/apiserver/bll/workers/stats.py
+++ b/apiserver/bll/workers/stats.py
@@ -215,6 +215,10 @@ class WorkerStats:
                     "date_histogram": {
                         "field": "timestamp",
                         "fixed_interval": f"{interval}s",
+                        "extended_bounds": {
+                          "min": int(from_date) * 1000,
+                          "max": int(to_date) * 1000,
+                        }
                     },
                     "aggs": {"workers_count": {"cardinality": {"field": "worker"}}},
                 }
diff --git a/apiserver/tests/automated/test_workers.py b/apiserver/tests/automated/test_workers.py
index 9f35857..93f41e8 100644
--- a/apiserver/tests/automated/test_workers.py
+++ b/apiserver/tests/automated/test_workers.py
@@ -1,10 +1,9 @@
 import time
 from uuid import uuid4
-from datetime import timedelta
 from typing import Sequence
 
 from apiserver.apierrors.errors import bad_request
-from apiserver.tests.automated import TestService, utc_now_tz_aware
+from apiserver.tests.automated import TestService
 from apiserver.config_repo import config
 
 log = config.logger(__file__)
@@ -84,7 +83,7 @@ class TestWorkersService(TestService):
         self._check_exists(test_worker, False, tags=["test"])
         self._check_exists(test_worker, False, tags=["-application"])
 
-    def _simulate_workers(self) -> Sequence[str]:
+    def _simulate_workers(self, start: int) -> Sequence[str]:
         """
         Two workers writing the same metrics. One for 4 seconds. Another one for 2
         The first worker reports a task
@@ -106,7 +105,7 @@ class TestWorkersService(TestService):
             (workers[0],),
             (workers[0],),
         ]
-        timestamp = int(utc_now_tz_aware().timestamp() * 1000)
+        timestamp = start * 1000
         for ws, stats in zip(workers_activity, workers_stats):
             for w, s in zip(ws, stats):
                 data = dict(
@@ -130,7 +129,7 @@ class TestWorkersService(TestService):
         return task_id
 
     def test_get_keys(self):
-        workers = self._simulate_workers()
+        workers = self._simulate_workers(int(time.time()))
         time.sleep(5)  # give to es time to refresh
         res = self.api.workers.get_metric_keys(worker_ids=workers)
         assert {"cpu", "memory"} == set(c.name for c in res["categories"])
@@ -147,12 +146,12 @@ class TestWorkersService(TestService):
             self.api.workers.get_metric_keys(worker_ids=["Non existing worker id"])
 
     def test_get_stats(self):
-        workers = self._simulate_workers()
-
-        to_date = utc_now_tz_aware() + timedelta(seconds=10)
-        from_date = to_date - timedelta(days=1)
+        start = int(time.time())
+        workers = self._simulate_workers(start)
 
         time.sleep(5)  # give to ES time to refresh
+        from_date = start
+        to_date = start + 10
         # no variants
         res = self.api.workers.get_stats(
             items=[
@@ -161,8 +160,8 @@ class TestWorkersService(TestService):
                 dict(key="memory_used", aggregation="max"),
                 dict(key="memory_used", aggregation="min"),
             ],
-            from_date=from_date.timestamp(),
-            to_date=to_date.timestamp(),
+            from_date=from_date,
+            to_date=to_date,
             # split_by_variant=True,
             interval=1,
             worker_ids=workers,
@@ -186,8 +185,8 @@ class TestWorkersService(TestService):
         # split by variants
         res = self.api.workers.get_stats(
             items=[dict(key="cpu_usage", aggregation="avg")],
-            from_date=from_date.timestamp(),
-            to_date=to_date.timestamp(),
+            from_date=from_date,
+            to_date=to_date,
             split_by_variant=True,
             interval=1,
             worker_ids=workers,
@@ -204,8 +203,8 @@ class TestWorkersService(TestService):
 
         res = self.api.workers.get_stats(
             items=[dict(key="cpu_usage", aggregation="avg")],
-            from_date=from_date.timestamp(),
-            to_date=to_date.timestamp(),
+            from_date=from_date,
+            to_date=to_date,
             interval=1,
             worker_ids=["Non existing worker id"],
         )
@@ -223,29 +222,19 @@ class TestWorkersService(TestService):
         #     to_timestamp=to_timestamp.timestamp(),
         #     interval=20,
         # )
-
-        self._simulate_workers()
-
-        to_date = utc_now_tz_aware() + timedelta(seconds=10)
-        from_date = to_date - timedelta(minutes=1)
+        start = int(time.time())
+        self._simulate_workers(int(time.time()))
 
         time.sleep(5)  # give to es time to refresh
         # no variants
         res = self.api.workers.get_activity_report(
-            from_date=from_date.timestamp(), to_date=to_date.timestamp(), interval=20
+            from_date=start, to_date=start + 10, interval=2
         )
-        self.assertWorkerSeries(res["total"], 2)
-        self.assertWorkerSeries(res["active"], 1)
-        self.assertTotalSeriesGreaterThenActive(res["total"], res["active"])
+        self.assertWorkerSeries(res["total"], 2, 5)
+        self.assertWorkerSeries(res["active"], 1, 5)
 
-    @staticmethod
-    def assertTotalSeriesGreaterThenActive(total_data: dict, active_data: dict):
-        assert total_data["dates"][-1] == active_data["dates"][-1]
-        assert total_data["counts"][-1] > active_data["counts"][-1]
-
-    @staticmethod
-    def assertWorkerSeries(series_data: dict, min_count: int):
-        assert len(series_data["dates"]) == len(series_data["counts"])
-        # check the last 20s aggregation
-        # there may be more workers that we created since we are not filtering by test workers here
-        assert series_data["counts"][-1] >= min_count
+    def assertWorkerSeries(self, series_data: dict, count: int, size: int):
+        self.assertEqual(len(series_data["dates"]), size)
+        self.assertEqual(len(series_data["counts"]), size)
+        self.assertTrue(any(c == count for c in series_data["counts"]))
+        self.assertTrue(all(c <= count for c in series_data["counts"]))