diff --git a/browser/ui/webui/brave_adblock_ui.cc b/browser/ui/webui/brave_adblock_ui.cc
index 69435db02d2..bd3b23e9b7f 100644
--- a/browser/ui/webui/brave_adblock_ui.cc
+++ b/browser/ui/webui/brave_adblock_ui.cc
@@ -9,6 +9,7 @@
 #include <utility>
 
 #include "base/scoped_observation.h"
+#include "base/util/values/values_util.h"
 #include "brave/browser/brave_browser_process.h"
 #include "brave/browser/ui/webui/brave_webui_source.h"
 #include "brave/common/webui_url_constants.h"
@@ -283,10 +284,11 @@ void AdblockDOMHandler::RefreshSubscriptionsList() {
     auto dict = std::make_unique<base::DictionaryValue>();
     dict->SetStringKey("list_url", subscription.list_url.spec());
     dict->SetBoolKey("enabled", subscription.enabled);
-    dict->SetDoubleKey("last_update_attempt",
-                       subscription.last_update_attempt.ToJsTime());
-    dict->SetDoubleKey("last_successful_update_attempt",
-                       subscription.last_successful_update_attempt.ToJsTime());
+    dict->SetKey("last_update_attempt",
+                 util::TimeToValue(subscription.last_update_attempt));
+    dict->SetKey(
+        "last_successful_update_attempt",
+        util::TimeToValue(subscription.last_successful_update_attempt));
     list_value->Append(std::move(dict));
   }
   CallJavascriptFunction("brave_adblock.onGetListSubscriptions", *list_value);
diff --git a/components/brave_shields/browser/ad_block_subscription_service_manager.cc b/components/brave_shields/browser/ad_block_subscription_service_manager.cc
index 611d5520d39..2345a3f645e 100644
--- a/components/brave_shields/browser/ad_block_subscription_service_manager.cc
+++ b/components/brave_shields/browser/ad_block_subscription_service_manager.cc
@@ -90,8 +90,8 @@ void AdBlockSubscriptionServiceManager::CreateSubscription(
   FilterListSubscriptionInfo info;
   info.list_url = list_url;
   info.list_dir = GetSubscriptionPath(list_url);
-  info.last_update_attempt = base::Time::Min();
-  info.last_successful_update_attempt = base::Time::Min();
+  info.last_update_attempt = base::Time();
+  info.last_successful_update_attempt = base::Time();
   info.enabled = true;
 
   auto subscription_service = std::make_unique<AdBlockSubscriptionService>(
@@ -238,20 +238,14 @@ void AdBlockSubscriptionServiceManager::UpdateFilterListPrefs(
     return;
   }
 
-  // TODO(bridiver) - update for Time
-  //   base::Value TimeToValue(base::Time time);
-  // base::Optional<base::Time> util::ValueToTime(const base::Value* value);
-  // base::Optional<base::Time> util::ValueToTime(const base::Value& value);
-
   DictionaryPrefUpdate update(local_state, prefs::kAdBlockListSubscriptions);
   base::DictionaryValue* subscriptions_dict = update.Get();
   auto subscription_dict = base::Value(base::Value::Type::DICTIONARY);
   subscription_dict.SetBoolKey("enabled", info.enabled);
-  subscription_dict.SetDoubleKey("last_update_attempt",
-                                 info.last_update_attempt.ToJsTime());
-  subscription_dict.SetDoubleKey(
-      "last_successful_update_attempt",
-      info.last_successful_update_attempt.ToJsTime());
+  subscription_dict.SetKey("last_update_attempt",
+                           util::TimeToValue(info.last_update_attempt));
+  subscription_dict.SetKey("last_update_attempt",
+                           util::TimeToValue(info.last_update_attempt));
   subscriptions_dict->SetKey(id.spec(), std::move(subscription_dict));
 }