diff --git a/test/common/config/BUILD b/test/common/config/BUILD
index 9b1756a2e9386..d97c5b3daf92b 100644
--- a/test/common/config/BUILD
+++ b/test/common/config/BUILD
@@ -52,6 +52,7 @@ envoy_cc_test(
         "//test/mocks/local_info:local_info_mocks",
         "//test/mocks/runtime:runtime_mocks",
         "//test/test_common:logging_lib",
+        "//test/test_common:simulated_time_system_lib",
         "//test/test_common:utility_lib",
         "@envoy_api//envoy/api/v2:discovery_cc",
         "@envoy_api//envoy/api/v2:eds_cc",
diff --git a/test/common/config/grpc_mux_impl_test.cc b/test/common/config/grpc_mux_impl_test.cc
index 030e7dbe26ec2..fb1abfb5c34fc 100644
--- a/test/common/config/grpc_mux_impl_test.cc
+++ b/test/common/config/grpc_mux_impl_test.cc
@@ -14,6 +14,7 @@
 #include "test/mocks/local_info/mocks.h"
 #include "test/mocks/runtime/mocks.h"
 #include "test/test_common/logging.h"
+#include "test/test_common/simulated_time_system.h"
 #include "test/test_common/utility.h"
 
 #include "gmock/gmock.h"
@@ -36,7 +37,7 @@ namespace {
 class GrpcMuxImplTest : public testing::Test {
 public:
   GrpcMuxImplTest() : async_client_(new Grpc::MockAsyncClient()) {
-    dispatcher_.setTimeSystem(mock_time_system_);
+    dispatcher_.setTimeSystem(time_system_);
   }
 
   void setup() {
@@ -76,7 +77,7 @@ class GrpcMuxImplTest : public testing::Test {
   Grpc::MockAsyncStream async_stream_;
   std::unique_ptr<GrpcMuxImpl> grpc_mux_;
   NiceMock<MockGrpcMuxCallbacks> callbacks_;
-  NiceMock<MockTimeSystem> mock_time_system_;
+  Event::SimulatedTimeSystem time_system_;
   NiceMock<LocalInfo::MockLocalInfo> local_info_;
   Stats::IsolatedStoreImpl stats_;
 };
@@ -310,8 +311,17 @@ TEST_F(GrpcMuxImplTest, WatchDemux) {
   expectSendMessage(type_url, {}, "2");
 }
 
+// Exactly one test requires a mock time system to provoke behavior that cannot
+// easily be achieved with a SimulatedTimeSystem.
+class GrpcMuxImplTestWithMockTimeSystem : public GrpcMuxImplTest {
+protected:
+  GrpcMuxImplTestWithMockTimeSystem() { dispatcher_.setTimeSystem(mock_time_system_); }
+
+  MockTimeSystem mock_time_system_;
+};
+
 //  Verifies that warning messages get logged when Envoy detects too many requests.
-TEST_F(GrpcMuxImplTest, TooManyRequests) {
+TEST_F(GrpcMuxImplTestWithMockTimeSystem, TooManyRequests) {
   setup();
 
   EXPECT_CALL(async_stream_, sendMessage(_, false)).Times(AtLeast(100));
diff --git a/test/common/http/BUILD b/test/common/http/BUILD
index 93fa583a5c478..b9f6104ed30e5 100644
--- a/test/common/http/BUILD
+++ b/test/common/http/BUILD
@@ -121,7 +121,7 @@ envoy_cc_fuzz_test(
         "//test/mocks/ssl:ssl_mocks",
         "//test/mocks/tracing:tracing_mocks",
         "//test/mocks/upstream:upstream_mocks",
-        "//test/test_common:test_time_lib",
+        "//test/test_common:simulated_time_system_lib",
         "@envoy_api//envoy/config/filter/network/http_connection_manager/v2:http_connection_manager_cc",
     ],
 )
diff --git a/test/common/http/conn_manager_impl_fuzz_test.cc b/test/common/http/conn_manager_impl_fuzz_test.cc
index 0eaf6d8e7ded0..2e6f2bcea62c0 100644
--- a/test/common/http/conn_manager_impl_fuzz_test.cc
+++ b/test/common/http/conn_manager_impl_fuzz_test.cc
@@ -31,7 +31,7 @@
 #include "test/mocks/ssl/mocks.h"
 #include "test/mocks/tracing/mocks.h"
 #include "test/mocks/upstream/mocks.h"
-#include "test/test_common/test_time.h"
+#include "test/test_common/simulated_time_system.h"
 
 #include "gmock/gmock.h"
 
@@ -56,7 +56,7 @@ class FuzzConfig : public ConnectionManagerConfig {
   };
 
   FuzzConfig()
-      : route_config_provider_(test_time_.timeSystem()),
+      : route_config_provider_(time_system_),
         stats_{{ALL_HTTP_CONN_MAN_STATS(POOL_COUNTER(fake_stats_), POOL_GAUGE(fake_stats_),
                                         POOL_HISTOGRAM(fake_stats_))},
                "",
@@ -121,7 +121,7 @@ class FuzzConfig : public ConnectionManagerConfig {
   MockStreamEncoderFilter* encoder_filter_{};
   NiceMock<MockFilterChainFactory> filter_factory_;
   absl::optional<std::chrono::milliseconds> idle_timeout_;
-  DangerousDeprecatedTestTime test_time_;
+  Event::SimulatedTimeSystem time_system_;
   RouteConfigProvider route_config_provider_;
   std::string server_name_;
   Stats::IsolatedStoreImpl fake_stats_;
@@ -382,7 +382,6 @@ DEFINE_PROTO_FUZZER(const test::common::http::ConnManagerImplTestCase& input) {
   NiceMock<LocalInfo::MockLocalInfo> local_info;
   NiceMock<Upstream::MockClusterManager> cluster_manager;
   NiceMock<Network::MockReadFilterCallbacks> filter_callbacks;
-  NiceMock<MockTimeSystem> time_system;
   std::unique_ptr<Ssl::MockConnection> ssl_connection;
   bool connection_alive = true;
 
@@ -396,7 +395,7 @@ DEFINE_PROTO_FUZZER(const test::common::http::ConnManagerImplTestCase& input) {
       std::make_shared<Network::Address::Ipv4Instance>("0.0.0.0");
 
   ConnectionManagerImpl conn_manager(config, drain_close, random, tracer, runtime, local_info,
-                                     cluster_manager, nullptr, time_system);
+                                     cluster_manager, nullptr, config.time_system_);
   conn_manager.initializeReadFilterCallbacks(filter_callbacks);
 
   std::vector<FuzzStreamPtr> streams;
diff --git a/test/common/network/BUILD b/test/common/network/BUILD
index ba4eadec52082..23b5f1548ccda 100644
--- a/test/common/network/BUILD
+++ b/test/common/network/BUILD
@@ -51,7 +51,7 @@ envoy_cc_test(
         "//test/mocks/stats:stats_mocks",
         "//test/test_common:environment_lib",
         "//test/test_common:network_utility_lib",
-        "//test/test_common:test_time_lib",
+        "//test/test_common:simulated_time_system_lib",
     ],
 )
 
diff --git a/test/common/network/connection_impl_test.cc b/test/common/network/connection_impl_test.cc
index 65aa72f6db99d..db7a63c676246 100644
--- a/test/common/network/connection_impl_test.cc
+++ b/test/common/network/connection_impl_test.cc
@@ -20,7 +20,7 @@
 #include "test/test_common/environment.h"
 #include "test/test_common/network_utility.h"
 #include "test/test_common/printers.h"
-#include "test/test_common/test_time.h"
+#include "test/test_common/simulated_time_system.h"
 #include "test/test_common/utility.h"
 
 #include "gmock/gmock.h"
@@ -77,7 +77,7 @@ INSTANTIATE_TEST_CASE_P(IpVersions, ConnectionImplDeathTest,
                         TestUtility::ipTestParamsToString);
 
 TEST_P(ConnectionImplDeathTest, BadFd) {
-  MockTimeSystem time_system;
+  Event::SimulatedTimeSystem time_system;
   Event::DispatcherImpl dispatcher(time_system);
   EXPECT_DEATH_LOG_TO_STDERR(
       ConnectionImpl(dispatcher, std::make_unique<ConnectionSocketImpl>(-1, nullptr, nullptr),
@@ -169,7 +169,7 @@ class ConnectionImplTest : public testing::TestWithParam<Address::IpVersion> {
   }
 
 protected:
-  MockTimeSystem time_system_;
+  Event::SimulatedTimeSystem time_system_;
   Event::DispatcherPtr dispatcher_;
   Stats::IsolatedStoreImpl stats_store_;
   Network::TcpListenSocket socket_{Network::Test::getAnyAddress(GetParam()), nullptr, true};
@@ -1271,7 +1271,7 @@ TEST_P(ReadBufferLimitTest, SomeLimit) {
 class TcpClientConnectionImplTest : public testing::TestWithParam<Address::IpVersion> {
 protected:
   TcpClientConnectionImplTest() : dispatcher_(time_system_) {}
-  MockTimeSystem time_system_;
+  Event::SimulatedTimeSystem time_system_;
   Event::DispatcherImpl dispatcher_;
 };
 INSTANTIATE_TEST_CASE_P(IpVersions, TcpClientConnectionImplTest,
@@ -1312,7 +1312,7 @@ TEST_P(TcpClientConnectionImplTest, BadConnectConnRefused) {
 class PipeClientConnectionImplTest : public testing::Test {
 protected:
   PipeClientConnectionImplTest() : dispatcher_(time_system_) {}
-  MockTimeSystem time_system_;
+  Event::SimulatedTimeSystem time_system_;
   Event::DispatcherImpl dispatcher_;
   const std::string path_{TestEnvironment::unixDomainSocketPath("foo")};
 };
diff --git a/test/common/upstream/BUILD b/test/common/upstream/BUILD
index a308e0881b0ba..789582d242f6f 100644
--- a/test/common/upstream/BUILD
+++ b/test/common/upstream/BUILD
@@ -158,6 +158,7 @@ envoy_cc_test(
         "//test/mocks/grpc:grpc_mocks",
         "//test/mocks/local_info:local_info_mocks",
         "//test/mocks/upstream:upstream_mocks",
+        "//test/test_common:simulated_time_system_lib",
         "//test/test_common:utility_lib",
         "@envoy_api//envoy/api/v2:eds_cc",
         "@envoy_api//envoy/api/v2/endpoint:endpoint_cc",
diff --git a/test/common/upstream/load_stats_reporter_test.cc b/test/common/upstream/load_stats_reporter_test.cc
index 1b69bfb2771a6..86bfaa79cb661 100644
--- a/test/common/upstream/load_stats_reporter_test.cc
+++ b/test/common/upstream/load_stats_reporter_test.cc
@@ -7,6 +7,7 @@
 #include "test/mocks/grpc/mocks.h"
 #include "test/mocks/local_info/mocks.h"
 #include "test/mocks/upstream/mocks.h"
+#include "test/test_common/simulated_time_system.h"
 #include "test/test_common/utility.h"
 
 #include "gmock/gmock.h"
@@ -75,7 +76,7 @@ class LoadStatsReporterTest : public testing::Test {
   Event::TimerCb response_timer_cb_;
   Grpc::MockAsyncStream async_stream_;
   Grpc::MockAsyncClient* async_client_;
-  MockTimeSystem time_system_;
+  Event::SimulatedTimeSystem time_system_;
   NiceMock<LocalInfo::MockLocalInfo> local_info_;
 };
 
@@ -93,14 +94,12 @@ TEST_F(LoadStatsReporterTest, TestPubSub) {
   EXPECT_CALL(*async_client_, start(_, _)).WillOnce(Return(&async_stream_));
   EXPECT_CALL(async_stream_, sendMessage(_, _));
   createLoadStatsReporter();
-  EXPECT_CALL(time_system_, monotonicTime());
   deliverLoadStatsResponse({"foo"});
 
   EXPECT_CALL(async_stream_, sendMessage(_, _));
   EXPECT_CALL(*response_timer_, enableTimer(std::chrono::milliseconds(42000)));
   response_timer_cb_();
 
-  EXPECT_CALL(time_system_, monotonicTime());
   deliverLoadStatsResponse({"bar"});
 
   EXPECT_CALL(async_stream_, sendMessage(_, _));
@@ -114,8 +113,7 @@ TEST_F(LoadStatsReporterTest, ExistingClusters) {
   // Initially, we have no clusters to report on.
   expectSendMessage({});
   createLoadStatsReporter();
-  EXPECT_CALL(time_system_, monotonicTime())
-      .WillOnce(Return(MonotonicTime(std::chrono::microseconds(3))));
+  time_system_.setMonotonicTime(std::chrono::microseconds(3));
   // Start reporting on foo.
   NiceMock<MockCluster> foo_cluster;
   foo_cluster.info_->load_report_stats_.upstream_rq_dropped_.add(2);
@@ -125,8 +123,7 @@ TEST_F(LoadStatsReporterTest, ExistingClusters) {
   deliverLoadStatsResponse({"foo"});
   // Initial stats report for foo on timer tick.
   foo_cluster.info_->load_report_stats_.upstream_rq_dropped_.add(5);
-  EXPECT_CALL(time_system_, monotonicTime())
-      .WillOnce(Return(MonotonicTime(std::chrono::microseconds(4))));
+  time_system_.setMonotonicTime(std::chrono::microseconds(4));
   {
     envoy::api::v2::endpoint::ClusterStats foo_cluster_stats;
     foo_cluster_stats.set_cluster_name("foo");
@@ -143,15 +140,12 @@ TEST_F(LoadStatsReporterTest, ExistingClusters) {
   bar_cluster.info_->load_report_stats_.upstream_rq_dropped_.add(1);
 
   // Start reporting on bar.
-  EXPECT_CALL(time_system_, monotonicTime())
-      .WillOnce(Return(MonotonicTime(std::chrono::microseconds(6))));
+  time_system_.setMonotonicTime(std::chrono::microseconds(6));
   deliverLoadStatsResponse({"foo", "bar"});
   // Stats report foo/bar on timer tick.
   foo_cluster.info_->load_report_stats_.upstream_rq_dropped_.add(1);
   bar_cluster.info_->load_report_stats_.upstream_rq_dropped_.add(1);
-  EXPECT_CALL(time_system_, monotonicTime())
-      .Times(2)
-      .WillRepeatedly(Return(MonotonicTime(std::chrono::microseconds(28))));
+  time_system_.setMonotonicTime(std::chrono::microseconds(28));
   {
     envoy::api::v2::endpoint::ClusterStats foo_cluster_stats;
     foo_cluster_stats.set_cluster_name("foo");
@@ -177,8 +171,7 @@ TEST_F(LoadStatsReporterTest, ExistingClusters) {
   // Stats report for bar on timer tick.
   foo_cluster.info_->load_report_stats_.upstream_rq_dropped_.add(5);
   bar_cluster.info_->load_report_stats_.upstream_rq_dropped_.add(5);
-  EXPECT_CALL(time_system_, monotonicTime())
-      .WillOnce(Return(MonotonicTime(std::chrono::microseconds(33))));
+  time_system_.setMonotonicTime(std::chrono::microseconds(33));
   {
     envoy::api::v2::endpoint::ClusterStats bar_cluster_stats;
     bar_cluster_stats.set_cluster_name("bar");
@@ -195,15 +188,12 @@ TEST_F(LoadStatsReporterTest, ExistingClusters) {
   bar_cluster.info_->load_report_stats_.upstream_rq_dropped_.add(1);
 
   // Start tracking foo again, we should forget earlier history for foo.
-  EXPECT_CALL(time_system_, monotonicTime())
-      .WillOnce(Return(MonotonicTime(std::chrono::microseconds(43))));
+  time_system_.setMonotonicTime(std::chrono::microseconds(43));
   deliverLoadStatsResponse({"foo", "bar"});
   // Stats report foo/bar on timer tick.
   foo_cluster.info_->load_report_stats_.upstream_rq_dropped_.add(1);
   bar_cluster.info_->load_report_stats_.upstream_rq_dropped_.add(1);
-  EXPECT_CALL(time_system_, monotonicTime())
-      .Times(2)
-      .WillRepeatedly(Return(MonotonicTime(std::chrono::microseconds(47))));
+  time_system_.setMonotonicTime(std::chrono::microseconds(47));
   {
     envoy::api::v2::endpoint::ClusterStats foo_cluster_stats;
     foo_cluster_stats.set_cluster_name("foo");
diff --git a/test/extensions/stats_sinks/metrics_service/BUILD b/test/extensions/stats_sinks/metrics_service/BUILD
index c6b8050fa0e8e..d9759e8df43d6 100644
--- a/test/extensions/stats_sinks/metrics_service/BUILD
+++ b/test/extensions/stats_sinks/metrics_service/BUILD
@@ -25,6 +25,7 @@ envoy_extension_cc_test(
         "//test/mocks/local_info:local_info_mocks",
         "//test/mocks/thread_local:thread_local_mocks",
         "//test/mocks/upstream:upstream_mocks",
+        "//test/test_common:simulated_time_system_lib",
     ],
 )
 
diff --git a/test/extensions/stats_sinks/metrics_service/grpc_metrics_service_impl_test.cc b/test/extensions/stats_sinks/metrics_service/grpc_metrics_service_impl_test.cc
index ab078fe6953f1..861f14772afb6 100644
--- a/test/extensions/stats_sinks/metrics_service/grpc_metrics_service_impl_test.cc
+++ b/test/extensions/stats_sinks/metrics_service/grpc_metrics_service_impl_test.cc
@@ -5,6 +5,7 @@
 #include "test/mocks/local_info/mocks.h"
 #include "test/mocks/stats/mocks.h"
 #include "test/mocks/thread_local/mocks.h"
+#include "test/test_common/simulated_time_system.h"
 
 using namespace std::chrono_literals;
 using testing::_;
@@ -99,10 +100,10 @@ class MetricsServiceSinkTest : public testing::Test {};
 
 TEST(MetricsServiceSinkTest, CheckSendCall) {
   NiceMock<Stats::MockSource> source;
-  NiceMock<MockTimeSystem> mock_time;
+  Event::SimulatedTimeSystem time_system;
   std::shared_ptr<MockGrpcMetricsStreamer> streamer_{new MockGrpcMetricsStreamer()};
 
-  MetricsServiceSink sink(streamer_, mock_time);
+  MetricsServiceSink sink(streamer_, time_system);
 
   auto counter = std::make_shared<NiceMock<Stats::MockCounter>>();
   counter->name_ = "test_counter";
@@ -127,10 +128,10 @@ TEST(MetricsServiceSinkTest, CheckSendCall) {
 
 TEST(MetricsServiceSinkTest, CheckStatsCount) {
   NiceMock<Stats::MockSource> source;
-  NiceMock<MockTimeSystem> mock_time;
+  Event::SimulatedTimeSystem time_system;
   std::shared_ptr<TestGrpcMetricsStreamer> streamer_{new TestGrpcMetricsStreamer()};
 
-  MetricsServiceSink sink(streamer_, mock_time);
+  MetricsServiceSink sink(streamer_, time_system);
 
   auto counter = std::make_shared<NiceMock<Stats::MockCounter>>();
   counter->name_ = "test_counter";