test: Use NodeClockContext in more tests

diff --git a/src/bench/util_time.cpp b/src/bench/util_time.cpp
index bc3e3892..19ffd0e0 100644
--- a/src/bench/util_time.cpp
+++ b/src/bench/util_time.cpp
@@ -3,7 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <bench/bench.h>
-
+#include <test/util/time.h>
 #include <util/time.h>
 
 static void BenchTimeDeprecated(benchmark::Bench& bench)
@@ -15,11 +15,10 @@ static void BenchTimeDeprecated(benchmark::Bench& bench)
 
 static void BenchTimeMock(benchmark::Bench& bench)
 {
-    SetMockTime(111);
+    NodeClockContext clock_ctx{111s};
     bench.run([&] {
         (void)GetTime<std::chrono::seconds>();
     });
-    SetMockTime(0);
 }
 
 static void BenchTimeMillis(benchmark::Bench& bench)
diff --git a/src/bench/wallet_balance.cpp b/src/bench/wallet_balance.cpp
index 03774ef5..45f23494 100644
--- a/src/bench/wallet_balance.cpp
+++ b/src/bench/wallet_balance.cpp
@@ -10,6 +10,7 @@
 #include <sync.h>
 #include <test/util/mining.h>
 #include <test/util/setup_common.h>
+#include <test/util/time.h>
 #include <uint256.h>
 #include <util/time.h>
 #include <validation.h>
@@ -32,7 +33,7 @@ static void WalletBalance(benchmark::Bench& bench, const bool set_dirty, const b
 
     // Set clock to genesis block, so the descriptors/keys creation time don't interfere with the blocks scanning process.
     // The reason is 'generatetoaddress', which creates a chain with deterministic timestamps in the past.
-    SetMockTime(test_setup->m_node.chainman->GetParams().GenesisBlock().nTime);
+    NodeClockContext clock_ctx{test_setup->m_node.chainman->GetParams().GenesisBlock().Time()};
     CWallet wallet{test_setup->m_node.chain.get(), "", CreateMockableWalletDatabase()};
     {
         LOCK(wallet.cs_wallet);
diff --git a/src/bench/wallet_create_tx.cpp b/src/bench/wallet_create_tx.cpp
index 8ff1e39a..11125e26 100644
--- a/src/bench/wallet_create_tx.cpp
+++ b/src/bench/wallet_create_tx.cpp
@@ -20,6 +20,7 @@
 #include <script/script.h>
 #include <sync.h>
 #include <test/util/setup_common.h>
+#include <test/util/time.h>
 #include <uint256.h>
 #include <util/result.h>
 #include <util/time.h>
@@ -117,7 +118,7 @@ static void WalletCreateTx(benchmark::Bench& bench, const OutputType output_type
     const auto test_setup = MakeNoLogFileContext<const TestingSetup>();
 
     // Set clock to genesis block, so the descriptors/keys creation time don't interfere with the blocks scanning process.
-    SetMockTime(test_setup->m_node.chainman->GetParams().GenesisBlock().nTime);
+    NodeClockContext clock_ctx{test_setup->m_node.chainman->GetParams().GenesisBlock().Time()};
     CWallet wallet{test_setup->m_node.chain.get(), "", CreateMockableWalletDatabase()};
     {
         LOCK(wallet.cs_wallet);
@@ -172,7 +173,7 @@ static void AvailableCoins(benchmark::Bench& bench, const std::vector<OutputType
 {
     const auto test_setup = MakeNoLogFileContext<const TestingSetup>();
     // Set clock to genesis block, so the descriptors/keys creation time don't interfere with the blocks scanning process.
-    SetMockTime(test_setup->m_node.chainman->GetParams().GenesisBlock().nTime);
+    NodeClockContext clock_ctx{test_setup->m_node.chainman->GetParams().GenesisBlock().Time()};
     CWallet wallet{test_setup->m_node.chain.get(), "", CreateMockableWalletDatabase()};
     {
         LOCK(wallet.cs_wallet);
diff --git a/src/test/addrman_tests.cpp b/src/test/addrman_tests.cpp
index e9069079..cd1c651a 100644
--- a/src/test/addrman_tests.cpp
+++ b/src/test/addrman_tests.cpp
@@ -12,6 +12,7 @@
 #include <random.h>
 #include <test/data/asmap.raw.h>
 #include <test/util/setup_common.h>
+#include <test/util/time.h>
 #include <util/asmap.h>
 #include <util/string.h>
 
@@ -1030,7 +1031,8 @@ BOOST_AUTO_TEST_CASE(addrman_evictionworks)
     BOOST_CHECK_EQUAL(addrman->SelectTriedCollision().first.ToStringAddrPort(), "250.1.1.36:0");
 
     // Eviction is also successful if too much time has passed since last try
-    SetMockTime(GetTime() + 4 * 60 *60);
+    NodeClockContext clock_ctx{};
+    clock_ctx += 4h;
     addrman->ResolveCollisions();
     BOOST_CHECK(addrman->SelectTriedCollision().first.ToStringAddrPort() == "[::]:0");
     //Now 19 is in tried again, and 36 back to new
diff --git a/src/test/banman_tests.cpp b/src/test/banman_tests.cpp
index 2b0c6218..d1e79e35 100644
--- a/src/test/banman_tests.cpp
+++ b/src/test/banman_tests.cpp
@@ -8,16 +8,16 @@
 #include <streams.h>
 #include <test/util/logging.h>
 #include <test/util/setup_common.h>
+#include <test/util/time.h>
 #include <util/readwritefile.h>
 
-
 #include <boost/test/unit_test.hpp>
 
 BOOST_FIXTURE_TEST_SUITE(banman_tests, BasicTestingSetup)
 
 BOOST_AUTO_TEST_CASE(file)
 {
-    SetMockTime(777s);
+    NodeClockContext clock_ctx{777s};
     const fs::path banlist_path{m_args.GetDataDirBase() / "banlist_test"};
     {
         const std::string entries_write{
diff --git a/src/test/chainstate_write_tests.cpp b/src/test/chainstate_write_tests.cpp
index 4a79cd8a..d0925b61 100644
--- a/src/test/chainstate_write_tests.cpp
+++ b/src/test/chainstate_write_tests.cpp
@@ -3,6 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <test/util/setup_common.h>
+#include <test/util/time.h>
 #include <validation.h>
 #include <validationinterface.h>
 
@@ -30,6 +31,7 @@ BOOST_FIXTURE_TEST_CASE(chainstate_write_interval, TestingSetup)
     m_node.validation_signals->RegisterSharedValidationInterface(sub);
     auto& chainstate{Assert(m_node.chainman)->ActiveChainstate()};
     BlockValidationState state_dummy{};
+    NodeClockContext clock_ctx{};
 
     // The first periodic flush sets m_next_write and does not flush
     chainstate.FlushStateToDisk(state_dummy, FlushStateMode::PERIODIC);
@@ -37,12 +39,12 @@ BOOST_FIXTURE_TEST_CASE(chainstate_write_interval, TestingSetup)
     BOOST_CHECK(!sub->m_did_flush);
 
     // The periodic flush interval is between 50 and 70 minutes (inclusive)
-    SetMockTime(GetTime<std::chrono::minutes>() + DATABASE_WRITE_INTERVAL_MIN - 1min);
+    clock_ctx += DATABASE_WRITE_INTERVAL_MIN - 1min;
     chainstate.FlushStateToDisk(state_dummy, FlushStateMode::PERIODIC);
     m_node.validation_signals->SyncWithValidationInterfaceQueue();
     BOOST_CHECK(!sub->m_did_flush);
 
-    SetMockTime(GetTime<std::chrono::minutes>() + DATABASE_WRITE_INTERVAL_MAX);
+    clock_ctx += DATABASE_WRITE_INTERVAL_MAX;
     chainstate.FlushStateToDisk(state_dummy, FlushStateMode::PERIODIC);
     m_node.validation_signals->SyncWithValidationInterfaceQueue();
     BOOST_CHECK(sub->m_did_flush);
diff --git a/src/test/denialofservice_tests.cpp b/src/test/denialofservice_tests.cpp
index 776a1878..9709eacd 100644
--- a/src/test/denialofservice_tests.cpp
+++ b/src/test/denialofservice_tests.cpp
@@ -16,6 +16,7 @@
 #include <test/util/net.h>
 #include <test/util/random.h>
 #include <test/util/setup_common.h>
+#include <test/util/time.h>
 #include <util/string.h>
 #include <util/time.h>
 #include <validation.h>
@@ -90,17 +91,17 @@ BOOST_AUTO_TEST_CASE(outbound_slow_chain_eviction)
     }
     connman.FlushSendBuffer(dummyNode1);
 
-    int64_t nStartTime = GetTime();
-    // Wait 21 minutes
-    SetMockTime(nStartTime+21*60);
+    NodeClockContext clock_ctx{};
+    clock_ctx += 21min;
+
     BOOST_CHECK(peerman.SendMessages(dummyNode1)); // should result in getheaders
     {
         LOCK(dummyNode1.cs_vSend);
         const auto& [to_send, _more, _msg_type] = dummyNode1.m_transport->GetBytesToSend(false);
         BOOST_CHECK(!to_send.empty());
     }
-    // Wait 3 more minutes
-    SetMockTime(nStartTime+24*60);
+
+    clock_ctx += 3min;
     BOOST_CHECK(peerman.SendMessages(dummyNode1)); // should result in disconnect
     BOOST_CHECK(dummyNode1.fDisconnect == true);
 
@@ -151,9 +152,9 @@ BOOST_FIXTURE_TEST_CASE(stale_tip_peer_management, OutboundTest)
     CConnman::Options options;
     options.m_max_automatic_connections = DEFAULT_MAX_PEER_CONNECTIONS;
 
-    const auto time_init{GetTime<std::chrono::seconds>()};
-    SetMockTime(time_init);
-    const auto time_later{time_init + 3 * std::chrono::seconds{m_node.chainman->GetConsensus().nPowTargetSpacing} + 1s};
+    const auto time_init{Now<NodeSeconds>()};
+    NodeClockContext clock_ctx{time_init};
+    const auto delta{3 * std::chrono::seconds{m_node.chainman->GetConsensus().nPowTargetSpacing} + 1s};
     connman->Init(options);
     std::vector<CNode *> vNodes;
 
@@ -169,7 +170,7 @@ BOOST_FIXTURE_TEST_CASE(stale_tip_peer_management, OutboundTest)
         BOOST_CHECK(node->fDisconnect == false);
     }
 
-    SetMockTime(time_later);
+    clock_ctx += delta;
 
     // Now tip should definitely be stale, and we should look for an extra
     // outbound peer
@@ -184,9 +185,9 @@ BOOST_FIXTURE_TEST_CASE(stale_tip_peer_management, OutboundTest)
     // If we add one more peer, something should get marked for eviction
     // on the next check (since we're mocking the time to be in the future, the
     // required time connected check should be satisfied).
-    SetMockTime(time_init);
+    clock_ctx.set(time_init);
     AddRandomOutboundPeer(id, vNodes, *peerLogic, *connman, ConnectionType::OUTBOUND_FULL_RELAY);
-    SetMockTime(time_later);
+    clock_ctx += delta;
 
     peerLogic->CheckForStaleTipAndEvictPeers();
     for (int i = 0; i < max_outbound_full_relay; ++i) {
@@ -212,9 +213,9 @@ BOOST_FIXTURE_TEST_CASE(stale_tip_peer_management, OutboundTest)
 
     // Add an onion peer, that will be protected because it is the only one for
     // its network, so another peer gets disconnected instead.
-    SetMockTime(time_init);
+    clock_ctx.set(time_init);
     AddRandomOutboundPeer(id, vNodes, *peerLogic, *connman, ConnectionType::OUTBOUND_FULL_RELAY, /*onion_peer=*/true);
-    SetMockTime(time_later);
+    clock_ctx += delta;
     peerLogic->CheckForStaleTipAndEvictPeers();
 
     for (int i = 0; i < max_outbound_full_relay - 2; ++i) {
@@ -225,9 +226,9 @@ BOOST_FIXTURE_TEST_CASE(stale_tip_peer_management, OutboundTest)
     BOOST_CHECK(vNodes[max_outbound_full_relay]->fDisconnect == false);
 
     // Add a second onion peer which won't be protected
-    SetMockTime(time_init);
+    clock_ctx.set(time_init);
     AddRandomOutboundPeer(id, vNodes, *peerLogic, *connman, ConnectionType::OUTBOUND_FULL_RELAY, /*onion_peer=*/true);
-    SetMockTime(time_later);
+    clock_ctx += delta;
     peerLogic->CheckForStaleTipAndEvictPeers();
 
     BOOST_CHECK(vNodes.back()->fDisconnect == true);
@@ -246,7 +247,7 @@ BOOST_FIXTURE_TEST_CASE(block_relay_only_eviction, OutboundTest)
     auto peerLogic = PeerManager::make(*connman, *m_node.addrman, nullptr, *m_node.chainman, *m_node.mempool, *m_node.warnings, {});
 
     constexpr int max_outbound_block_relay{MAX_BLOCK_RELAY_ONLY_CONNECTIONS};
-    constexpr int64_t MINIMUM_CONNECT_TIME{30};
+    constexpr auto MINIMUM_CONNECT_TIME{30s};
     CConnman::Options options;
     options.m_max_automatic_connections = DEFAULT_MAX_PEER_CONNECTIONS;
 
@@ -273,7 +274,8 @@ BOOST_FIXTURE_TEST_CASE(block_relay_only_eviction, OutboundTest)
     }
     BOOST_CHECK(vNodes.back()->fDisconnect == false);
 
-    SetMockTime(GetTime() + MINIMUM_CONNECT_TIME + 1);
+    NodeClockContext clock_ctx{};
+    clock_ctx += MINIMUM_CONNECT_TIME;
     peerLogic->CheckForStaleTipAndEvictPeers();
     for (int i = 0; i < max_outbound_block_relay; ++i) {
         BOOST_CHECK(vNodes[i]->fDisconnect == false);
@@ -411,8 +413,7 @@ BOOST_AUTO_TEST_CASE(DoS_bantime)
     auto peerLogic = PeerManager::make(*connman, *m_node.addrman, banman.get(), *m_node.chainman, *m_node.mempool, *m_node.warnings, {});
 
     banman->ClearBanned();
-    int64_t nStartTime = GetTime();
-    SetMockTime(nStartTime); // Overrides future calls to GetTime()
+    const NodeClockContext clock_ctx{}; // keep mocktime constant
 
     CAddress addr(ip(0xa0b0c001), NODE_NONE);
     NodeId id{0};
diff --git a/src/test/mempool_tests.cpp b/src/test/mempool_tests.cpp
index 67e26438..77024c3e 100644
--- a/src/test/mempool_tests.cpp
+++ b/src/test/mempool_tests.cpp
@@ -4,6 +4,7 @@
 
 #include <common/system.h>
 #include <policy/policy.h>
+#include <test/util/time.h>
 #include <test/util/txmempool.h>
 #include <txmempool.h>
 #include <util/time.h>
@@ -251,28 +252,29 @@ BOOST_AUTO_TEST_CASE(MempoolSizeLimitTest)
     TryAddToMempool(pool, entry.Fee(900LL).FromTx(tx7));
 
     std::vector<CTransactionRef> vtx;
-    SetMockTime(42);
-    SetMockTime(42 + CTxMemPool::ROLLING_FEE_HALFLIFE);
+    NodeClockContext clock_ctx{42s};
+    constexpr std::chrono::seconds HALFLIFE{CTxMemPool::ROLLING_FEE_HALFLIFE};
+    clock_ctx += HALFLIFE;
     BOOST_CHECK_EQUAL(pool.GetMinFee(1).GetFeePerK(), maxFeeRateRemoved.GetFeePerK() + DEFAULT_INCREMENTAL_RELAY_FEE);
     // ... we should keep the same min fee until we get a block
     pool.removeForBlock(vtx, 1);
-    SetMockTime(42 + 2*CTxMemPool::ROLLING_FEE_HALFLIFE);
+    clock_ctx += HALFLIFE;
     BOOST_CHECK_EQUAL(pool.GetMinFee(1).GetFeePerK(), llround((maxFeeRateRemoved.GetFeePerK() + DEFAULT_INCREMENTAL_RELAY_FEE)/2.0));
     // ... then feerate should drop 1/2 each halflife
 
-    SetMockTime(42 + 2*CTxMemPool::ROLLING_FEE_HALFLIFE + CTxMemPool::ROLLING_FEE_HALFLIFE/2);
+    clock_ctx += HALFLIFE / 2;
     BOOST_CHECK_EQUAL(pool.GetMinFee(pool.DynamicMemoryUsage() * 5 / 2).GetFeePerK(), llround((maxFeeRateRemoved.GetFeePerK() + DEFAULT_INCREMENTAL_RELAY_FEE)/4.0));
     // ... with a 1/2 halflife when mempool is < 1/2 its target size
 
-    SetMockTime(42 + 2*CTxMemPool::ROLLING_FEE_HALFLIFE + CTxMemPool::ROLLING_FEE_HALFLIFE/2 + CTxMemPool::ROLLING_FEE_HALFLIFE/4);
+    clock_ctx += HALFLIFE / 4;
     BOOST_CHECK_EQUAL(pool.GetMinFee(pool.DynamicMemoryUsage() * 9 / 2).GetFeePerK(), llround((maxFeeRateRemoved.GetFeePerK() + DEFAULT_INCREMENTAL_RELAY_FEE)/8.0));
     // ... with a 1/4 halflife when mempool is < 1/4 its target size
 
-    SetMockTime(42 + 7*CTxMemPool::ROLLING_FEE_HALFLIFE + CTxMemPool::ROLLING_FEE_HALFLIFE/2 + CTxMemPool::ROLLING_FEE_HALFLIFE/4);
+    clock_ctx += 5 * HALFLIFE;
     BOOST_CHECK_EQUAL(pool.GetMinFee(1).GetFeePerK(), DEFAULT_INCREMENTAL_RELAY_FEE);
     // ... but feerate should never drop below DEFAULT_INCREMENTAL_RELAY_FEE
 
-    SetMockTime(42 + 8*CTxMemPool::ROLLING_FEE_HALFLIFE + CTxMemPool::ROLLING_FEE_HALFLIFE/2 + CTxMemPool::ROLLING_FEE_HALFLIFE/4);
+    clock_ctx += HALFLIFE;
     BOOST_CHECK_EQUAL(pool.GetMinFee(1).GetFeePerK(), 0);
     // ... unless it has gone all the way to 0 (after getting past DEFAULT_INCREMENTAL_RELAY_FEE/2)
 }
diff --git a/src/test/orphanage_tests.cpp b/src/test/orphanage_tests.cpp
index 6ebfab34..9903434c 100644
--- a/src/test/orphanage_tests.cpp
+++ b/src/test/orphanage_tests.cpp
@@ -13,6 +13,7 @@
 #include <test/util/common.h>
 #include <test/util/random.h>
 #include <test/util/setup_common.h>
+#include <test/util/time.h>
 #include <test/util/transaction_utils.h>
 
 #include <array>
@@ -431,9 +432,7 @@ BOOST_AUTO_TEST_CASE(DoS_mapOrphans)
     FillableSigningProvider keystore;
     BOOST_CHECK(keystore.AddKey(key));
 
-    // Freeze time for length of test
-    auto now{GetTime<std::chrono::seconds>()};
-    SetMockTime(now);
+    NodeClockContext clock_ctx{};
 
     std::vector<CTransactionRef> orphans_added;
 
diff --git a/src/test/testnet4_miner_tests.cpp b/src/test/testnet4_miner_tests.cpp
index d0aeebe0..1bfc19db 100644
--- a/src/test/testnet4_miner_tests.cpp
+++ b/src/test/testnet4_miner_tests.cpp
@@ -5,11 +5,12 @@
 #include <common/system.h>
 #include <interfaces/mining.h>
 #include <node/miner.h>
+#include <test/util/common.h>
+#include <test/util/setup_common.h>
+#include <test/util/time.h>
 #include <util/time.h>
 #include <validation.h>
 
-#include <test/util/setup_common.h>
-
 #include <boost/test/unit_test.hpp>
 
 using interfaces::BlockTemplate;
@@ -39,14 +40,14 @@ BOOST_AUTO_TEST_CASE(MiningInterface)
     std::unique_ptr<BlockTemplate> block_template;
 
     // Set node time a few minutes past the testnet4 genesis block
-    const int64_t genesis_time{WITH_LOCK(cs_main, return m_node.chainman->ActiveChain().Tip()->GetBlockTime())};
-    SetMockTime(genesis_time + 3 * 60);
+    const auto template_time{3min + WITH_LOCK(cs_main, return m_node.chainman->ActiveChain().Tip()->Time())};
+    NodeClockContext clock_ctx{template_time};
 
     block_template = mining->createNewBlock(options, /*cooldown=*/false);
     BOOST_REQUIRE(block_template);
 
     // The template should use the mocked system time
-    BOOST_REQUIRE_EQUAL(block_template->getBlockHeader().nTime, genesis_time + 3 * 60);
+    BOOST_REQUIRE_EQUAL(block_template->getBlockHeader().Time(), template_time);
 
     const BlockWaitOptions wait_options{.timeout = MillisecondsDouble{0}, .fee_threshold = 1};
 
@@ -55,20 +56,14 @@ BOOST_AUTO_TEST_CASE(MiningInterface)
     BOOST_REQUIRE(should_be_nullptr == nullptr);
 
     // This remains the case when exactly 20 minutes have gone by
-    {
-        LOCK(cs_main);
-        SetMockTime(m_node.chainman->ActiveChain().Tip()->GetBlockTime() + 20 * 60);
-    }
+    clock_ctx += 17min;
     should_be_nullptr = block_template->waitNext(wait_options);
     BOOST_REQUIRE(should_be_nullptr == nullptr);
 
     // One second later the difficulty drops and it returns a new template
     // Note that we can't test the actual difficulty change, because the
     // difficulty is already at 1.
-    {
-        LOCK(cs_main);
-        SetMockTime(m_node.chainman->ActiveChain().Tip()->GetBlockTime() + 20 * 60 + 1);
-    }
+    clock_ctx += 1s;
     block_template = block_template->waitNext(wait_options);
     BOOST_REQUIRE(block_template);
 }
diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
index 8896807f..f6a8d3a4 100644
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -12,6 +12,7 @@
 #include <test/util/common.h>
 #include <test/util/random.h>
 #include <test/util/setup_common.h>
+#include <test/util/time.h>
 #include <uint256.h>
 #include <util/bitdeque.h>
 #include <util/byte_units.h>
@@ -585,7 +586,7 @@ BOOST_AUTO_TEST_CASE(strprintf_numbers)
 
 BOOST_AUTO_TEST_CASE(util_mocktime)
 {
-    SetMockTime(111s);
+    NodeClockContext clock_ctx{111s};
     // Check that mock time does not change after a sleep
     for (const auto& num_sleep : {0ms, 1ms}) {
         UninterruptibleSleep(num_sleep);
@@ -598,7 +599,6 @@ BOOST_AUTO_TEST_CASE(util_mocktime)
         BOOST_CHECK_EQUAL(111000, TicksSinceEpoch<std::chrono::milliseconds>(NodeClock::now()));
         BOOST_CHECK_EQUAL(111000000, GetTime<std::chrono::microseconds>().count());
     }
-    SetMockTime(0s);
 }
 
 BOOST_AUTO_TEST_CASE(util_ticksseconds)