diff --git a/src/test/CMakeLists.txt b/src/test/CMakeLists.txt
--- a/src/test/CMakeLists.txt
+++ b/src/test/CMakeLists.txt
@@ -70,6 +70,7 @@
 		../wallet/test/init_tests.cpp
 		../wallet/test/ismine_tests.cpp
 		../wallet/test/psbt_wallet_tests.cpp
+		../wallet/test/rpc_util_tests.cpp
 		../wallet/test/scriptpubkeyman_tests.cpp
 		../wallet/test/wallet_tests.cpp
 		../wallet/test/walletdb_tests.cpp
diff --git a/src/test/fuzz/CMakeLists.txt b/src/test/fuzz/CMakeLists.txt
--- a/src/test/fuzz/CMakeLists.txt
+++ b/src/test/fuzz/CMakeLists.txt
@@ -129,7 +129,6 @@
 	netaddress
 	p2p_transport_deserializer
 	parse_hd_keypath
-	parse_iso8601
 	parse_numbers
 	parse_script
 	parse_univalue
@@ -164,6 +163,8 @@
 	tx_in
 	tx_out
 	txrequest
+	# TODO: move the following to src/wallet/test/fuzz/CMakeLists.txt when backporting core#23334
+	../../wallet/test/fuzz/parse_iso8601
 )
 
 add_deserialize_fuzz_targets(
diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -197,14 +197,10 @@
     test_replaceall("'", "foo", "A test \"%s\" string foo%sfoo.");
 }
 
-BOOST_AUTO_TEST_CASE(util_FormatParseISO8601DateTime) {
+BOOST_AUTO_TEST_CASE(util_FormatISO8601DateTime) {
     BOOST_CHECK_EQUAL(FormatISO8601DateTime(1317425777),
                       "2011-09-30T23:36:17Z");
     BOOST_CHECK_EQUAL(FormatISO8601DateTime(0), "1970-01-01T00:00:00Z");
-
-    BOOST_CHECK_EQUAL(ParseISO8601DateTime("1970-01-01T00:00:00Z"), 0);
-    BOOST_CHECK_EQUAL(ParseISO8601DateTime("1960-01-01T00:00:00Z"), 0);
-    BOOST_CHECK_EQUAL(ParseISO8601DateTime("2011-09-30T23:36:17Z"), 1317425777);
 }
 
 BOOST_AUTO_TEST_CASE(util_FormatISO8601Date) {
diff --git a/src/util/time.h b/src/util/time.h
--- a/src/util/time.h
+++ b/src/util/time.h
@@ -100,7 +100,6 @@
  */
 std::string FormatISO8601DateTime(int64_t nTime);
 std::string FormatISO8601Date(int64_t nTime);
-int64_t ParseISO8601DateTime(const std::string &str);
 
 /**
  * Convert milliseconds to a struct timeval for e.g. select.
diff --git a/src/util/time.cpp b/src/util/time.cpp
--- a/src/util/time.cpp
+++ b/src/util/time.cpp
@@ -12,8 +12,6 @@
 #include <compat.h>
 #include <util/check.h>
 
-#include <boost/date_time/posix_time/posix_time.hpp>
-
 #include <tinyformat.h>
 
 #include <atomic>
@@ -144,22 +142,6 @@
                      ts.tm_mday);
 }
 
-int64_t ParseISO8601DateTime(const std::string &str) {
-    static const boost::posix_time::ptime epoch =
-        boost::posix_time::from_time_t(0);
-    static const std::locale loc(
-        std::locale::classic(),
-        new boost::posix_time::time_input_facet("%Y-%m-%dT%H:%M:%SZ"));
-    std::istringstream iss(str);
-    iss.imbue(loc);
-    boost::posix_time::ptime ptime(boost::date_time::not_a_date_time);
-    iss >> ptime;
-    if (ptime.is_not_a_date_time() || epoch > ptime) {
-        return 0;
-    }
-    return (ptime - epoch).total_seconds();
-}
-
 struct timeval MillisToTimeval(int64_t nTimeout) {
     struct timeval timeout;
     timeout.tv_sec = nTimeout / 1000;
diff --git a/src/wallet/rpc/util.h b/src/wallet/rpc/util.h
--- a/src/wallet/rpc/util.h
+++ b/src/wallet/rpc/util.h
@@ -44,4 +44,6 @@
 LoadWalletHelper(WalletContext &context, UniValue load_on_start_param,
                  const std::string wallet_name);
 
+int64_t ParseISO8601DateTime(const std::string &str);
+
 #endif // BITCOIN_WALLET_RPC_UTIL_H
diff --git a/src/wallet/rpc/util.cpp b/src/wallet/rpc/util.cpp
--- a/src/wallet/rpc/util.cpp
+++ b/src/wallet/rpc/util.cpp
@@ -12,11 +12,29 @@
 
 #include <univalue.h>
 
+#include <boost/date_time/posix_time/posix_time.hpp>
+
 static const std::string WALLET_ENDPOINT_BASE = "/wallet/";
 const std::string HELP_REQUIRING_PASSPHRASE{
     "\nRequires wallet passphrase to be set with walletpassphrase call if "
     "wallet is encrypted.\n"};
 
+int64_t ParseISO8601DateTime(const std::string &str) {
+    static const boost::posix_time::ptime epoch =
+        boost::posix_time::from_time_t(0);
+    static const std::locale loc(
+        std::locale::classic(),
+        new boost::posix_time::time_input_facet("%Y-%m-%dT%H:%M:%SZ"));
+    std::istringstream iss(str);
+    iss.imbue(loc);
+    boost::posix_time::ptime ptime(boost::date_time::not_a_date_time);
+    iss >> ptime;
+    if (ptime.is_not_a_date_time() || epoch > ptime) {
+        return 0;
+    }
+    return (ptime - epoch).total_seconds();
+}
+
 bool GetAvoidReuseFlag(const CWallet *const pwallet, const UniValue &param) {
     bool can_avoid_reuse = pwallet->IsWalletFlagSet(WALLET_FLAG_AVOID_REUSE);
     bool avoid_reuse = param.isNull() ? can_avoid_reuse : param.get_bool();
diff --git a/src/test/fuzz/parse_iso8601.cpp b/src/wallet/test/fuzz/parse_iso8601.cpp
rename from src/test/fuzz/parse_iso8601.cpp
rename to src/wallet/test/fuzz/parse_iso8601.cpp
--- a/src/test/fuzz/parse_iso8601.cpp
+++ b/src/wallet/test/fuzz/parse_iso8601.cpp
@@ -5,6 +5,7 @@
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
 #include <util/time.h>
+#include <wallet/rpc/util.h>
 
 #include <cassert>
 #include <cstdint>
diff --git a/src/wallet/test/rpc_util_tests.cpp b/src/wallet/test/rpc_util_tests.cpp
new file mode 100644
--- /dev/null
+++ b/src/wallet/test/rpc_util_tests.cpp
@@ -0,0 +1,19 @@
+// Copyright (c) 2022 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <wallet/rpc/util.h>
+
+#include <boost/test/unit_test.hpp>
+
+BOOST_AUTO_TEST_SUITE(rpc_util_tests)
+
+BOOST_AUTO_TEST_CASE(util_ParseISO8601DateTime) {
+    BOOST_CHECK_EQUAL(ParseISO8601DateTime("1970-01-01T00:00:00Z"), 0);
+    BOOST_CHECK_EQUAL(ParseISO8601DateTime("1960-01-01T00:00:00Z"), 0);
+    BOOST_CHECK_EQUAL(ParseISO8601DateTime("2000-01-01T00:00:01Z"), 946684801);
+    BOOST_CHECK_EQUAL(ParseISO8601DateTime("2011-09-30T23:36:17Z"), 1317425777);
+    BOOST_CHECK_EQUAL(ParseISO8601DateTime("2100-12-31T23:59:59Z"), 4133980799);
+}
+
+BOOST_AUTO_TEST_SUITE_END()