diff --git a/modules/rtp_rtcp/include/flexfec_receiver.h b/modules/rtp_rtcp/include/flexfec_receiver.h
index 3cf4c3845e..a869c8ad41 100644
--- a/modules/rtp_rtcp/include/flexfec_receiver.h
+++ b/modules/rtp_rtcp/include/flexfec_receiver.h
@@ -16,6 +16,7 @@
 #include <memory>
 
 #include "api/sequence_checker.h"
+#include "api/units/timestamp.h"
 #include "modules/rtp_rtcp/include/recovered_packet_receiver.h"
 #include "modules/rtp_rtcp/source/forward_error_correction.h"
 #include "modules/rtp_rtcp/source/rtp_packet_received.h"
@@ -67,7 +68,8 @@ class FlexfecReceiver {
 
   // Logging and stats.
   Clock* const clock_;
-  int64_t last_recovered_packet_ms_ RTC_GUARDED_BY(sequence_checker_);
+  Timestamp last_recovered_packet_ RTC_GUARDED_BY(sequence_checker_) =
+      Timestamp::MinusInfinity();
   FecPacketCounter packet_counter_ RTC_GUARDED_BY(sequence_checker_);
 
   RTC_NO_UNIQUE_ADDRESS SequenceChecker sequence_checker_;
diff --git a/modules/rtp_rtcp/include/flexfec_sender.h b/modules/rtp_rtcp/include/flexfec_sender.h
index f0acfe6c3d..b61781a480 100644
--- a/modules/rtp_rtcp/include/flexfec_sender.h
+++ b/modules/rtp_rtcp/include/flexfec_sender.h
@@ -18,6 +18,7 @@
 #include "absl/strings/string_view.h"
 #include "api/array_view.h"
 #include "api/rtp_parameters.h"
+#include "api/units/timestamp.h"
 #include "modules/rtp_rtcp/include/rtp_header_extension_map.h"
 #include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
 #include "modules/rtp_rtcp/source/rtp_header_extension_size.h"
@@ -77,7 +78,7 @@ class FlexfecSender : public VideoFecGenerator {
   // Utility.
   Clock* const clock_;
   Random random_;
-  int64_t last_generated_packet_ms_;
+  Timestamp last_generated_packet_ = Timestamp::MinusInfinity();
 
   // Config.
   const int payload_type_;
diff --git a/modules/rtp_rtcp/source/flexfec_receiver.cc b/modules/rtp_rtcp/source/flexfec_receiver.cc
index 3f345cd6d2..132ed164f9 100644
--- a/modules/rtp_rtcp/source/flexfec_receiver.cc
+++ b/modules/rtp_rtcp/source/flexfec_receiver.cc
@@ -14,6 +14,8 @@
 
 #include "api/array_view.h"
 #include "api/scoped_refptr.h"
+#include "api/units/time_delta.h"
+#include "api/units/timestamp.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/logging.h"
 
@@ -25,7 +27,7 @@ namespace {
 constexpr size_t kMinFlexfecHeaderSize = 20;
 
 // How often to log the recovered packets to the text log.
-constexpr int kPacketLogIntervalMs = 10000;
+constexpr TimeDelta kPacketLogInterval = TimeDelta::Seconds(10);
 
 }  // namespace
 
@@ -48,8 +50,7 @@ FlexfecReceiver::FlexfecReceiver(
       erasure_code_(
           ForwardErrorCorrection::CreateFlexfec(ssrc, protected_media_ssrc)),
       recovered_packet_receiver_(recovered_packet_receiver),
-      clock_(clock),
-      last_recovered_packet_ms_(-1) {
+      clock_(clock) {
   // It's OK to create this object on a different thread/task queue than
   // the one used during main operation.
   sequence_checker_.Detach();
@@ -173,9 +174,9 @@ void FlexfecReceiver::ProcessReceivedPacket(
     recovered_packet_receiver_->OnRecoveredPacket(parsed_packet);
 
     // Periodically log the incoming packets at LS_INFO.
-    int64_t now_ms = clock_->TimeInMilliseconds();
+    Timestamp now = clock_->CurrentTime();
     bool should_log_periodically =
-        now_ms - last_recovered_packet_ms_ > kPacketLogIntervalMs;
+        now - last_recovered_packet_ > kPacketLogInterval;
     if (RTC_LOG_CHECK_LEVEL(LS_VERBOSE) || should_log_periodically) {
       rtc::LoggingSeverity level =
           should_log_periodically ? rtc::LS_INFO : rtc::LS_VERBOSE;
@@ -185,7 +186,7 @@ void FlexfecReceiver::ProcessReceivedPacket(
                        << recovered_packet->pkt->data.size()
                        << " from FlexFEC stream with SSRC: " << ssrc_;
       if (should_log_periodically) {
-        last_recovered_packet_ms_ = now_ms;
+        last_recovered_packet_ = now;
       }
     }
   }
diff --git a/modules/rtp_rtcp/source/flexfec_sender.cc b/modules/rtp_rtcp/source/flexfec_sender.cc
index 292fe4a8dd..c8bac0114d 100644
--- a/modules/rtp_rtcp/source/flexfec_sender.cc
+++ b/modules/rtp_rtcp/source/flexfec_sender.cc
@@ -16,6 +16,8 @@
 #include <utility>
 
 #include "absl/strings/string_view.h"
+#include "api/units/time_delta.h"
+#include "api/units/timestamp.h"
 #include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
 #include "modules/rtp_rtcp/source/forward_error_correction.h"
 #include "modules/rtp_rtcp/source/rtp_header_extensions.h"
@@ -42,7 +44,7 @@ constexpr size_t kFlexfecMaxHeaderSize = 32;
 const int kMsToRtpTimestamp = kVideoPayloadTypeFrequency / 1000;
 
 // How often to log the generated FEC packets to the text log.
-constexpr int64_t kPacketLogIntervalMs = 10000;
+constexpr TimeDelta kPacketLogInterval = TimeDelta::Seconds(10);
 
 RtpHeaderExtensionMap RegisterSupportedExtensions(
     const std::vector<RtpExtension>& rtp_header_extensions) {
@@ -79,7 +81,6 @@ FlexfecSender::FlexfecSender(
     Clock* clock)
     : clock_(clock),
       random_(clock_->TimeInMicroseconds()),
-      last_generated_packet_ms_(-1),
       payload_type_(payload_type),
       // Reset RTP state if this is not the first time we are operating.
       // Otherwise, randomize the initial timestamp offset and RTP sequence
@@ -168,17 +169,17 @@ std::vector<std::unique_ptr<RtpPacketToSend>> FlexfecSender::GetFecPackets() {
     ulpfec_generator_.ResetState();
   }
 
-  int64_t now_ms = clock_->TimeInMilliseconds();
+  Timestamp now = clock_->CurrentTime();
   if (!fec_packets_to_send.empty() &&
-      now_ms - last_generated_packet_ms_ > kPacketLogIntervalMs) {
+      now - last_generated_packet_ > kPacketLogInterval) {
     RTC_LOG(LS_VERBOSE) << "Generated " << fec_packets_to_send.size()
                         << " FlexFEC packets with payload type: "
                         << payload_type_ << " and SSRC: " << ssrc_ << ".";
-    last_generated_packet_ms_ = now_ms;
+    last_generated_packet_ = now;
   }
 
   MutexLock lock(&mutex_);
-  fec_bitrate_.Update(total_fec_data_bytes, now_ms);
+  fec_bitrate_.Update(total_fec_data_bytes, now.ms());
 
   return fec_packets_to_send;
 }