diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 82f6cefe0..4e8224db2 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -60,7 +60,6 @@ set(ZM_BIN_SRC_FILES
   zm_signal.cpp
   zm_stream.cpp
   zm_swscale.cpp
-  zm_time.cpp
   zm_user.cpp
   zm_utils.cpp
   zm_videostore.cpp
diff --git a/src/zm_event.cpp b/src/zm_event.cpp
index 32cb95f76..b9b5f3925 100644
--- a/src/zm_event.cpp
+++ b/src/zm_event.cpp
@@ -238,7 +238,7 @@ Event::~Event() {
     gettimeofday(&end_time, nullptr);
   }
 
-  std::chrono::duration<double> delta_time =
+  FPSeconds delta_time =
       zm::chrono::duration_cast<Microseconds>(end_time) - zm::chrono::duration_cast<Microseconds>(start_time);
   Debug(2, "start_time: %" PRIi64 ".% " PRIi64 " end_time: %" PRIi64 ".%" PRIi64,
         static_cast<int64>(start_time.tv_sec),
@@ -580,7 +580,7 @@ void Event::AddFrame(
     or ( monitor_state == Monitor::PREALARM );
 
   if (db_frame) {
-    std::chrono::duration<double> delta_time =
+    FPSeconds delta_time =
         zm::chrono::duration_cast<Microseconds>(timestamp) - zm::chrono::duration_cast<Microseconds>(start_time);
     Debug(1, "Frame delta is %" PRIi64 ".%" PRIi64 " - %" PRIi64 ".%" PRIi64 " = %.2f, score %u zone_stats.size %zu",
           static_cast<int64>(start_time.tv_sec), static_cast<int64>(start_time.tv_usec),
diff --git a/src/zm_monitorstream.cpp b/src/zm_monitorstream.cpp
index a9fead28b..99cc01720 100644
--- a/src/zm_monitorstream.cpp
+++ b/src/zm_monitorstream.cpp
@@ -347,8 +347,7 @@ bool MonitorStream::sendFrame(const char *filepath, const timeval &timestamp) {
     }
 
     // Calculate how long it takes to actually send the frame
-    struct timeval frameStartTime;
-    gettimeofday(&frameStartTime, nullptr);
+    TimePoint send_start_time = std::chrono::steady_clock::now();
 
     if (
         (0 > fprintf(stdout, "Content-Length: %d\r\nX-Timestamp: %d.%06d\r\n\r\n",
@@ -363,13 +362,14 @@ bool MonitorStream::sendFrame(const char *filepath, const timeval &timestamp) {
     fputs("\r\n", stdout);
     fflush(stdout);
 
-    struct timeval frameEndTime;
-    gettimeofday(&frameEndTime, nullptr);
+    TimePoint send_end_time = std::chrono::steady_clock::now();
+    Milliseconds frame_send_time = std::chrono::duration_cast<Milliseconds>(send_end_time - send_start_time);
 
-    int frameSendTime = tvDiffMsec(frameStartTime, frameEndTime);
-    if ( frameSendTime > 1000/maxfps ) {
+    if (frame_send_time > Milliseconds(lround(Milliseconds::period::den / maxfps))) {
       maxfps /= 2;
-      Info("Frame send time %d msec too slow, throttling maxfps to %.2f", frameSendTime, maxfps);
+      Info("Frame send time %" PRIi64 " msec too slow, throttling maxfps to %.2f",
+           static_cast<int64>(frame_send_time.count()),
+           maxfps);
     }
 
     last_frame_sent = TV_2_FLOAT(now);
@@ -408,8 +408,7 @@ bool MonitorStream::sendFrame(Image *image, const timeval &timestamp) {
     unsigned char *img_buffer = temp_img_buffer;
 
     // Calculate how long it takes to actually send the frame
-    struct timeval frameStartTime;
-    gettimeofday(&frameStartTime, nullptr);
+    TimePoint send_start_time = std::chrono::steady_clock::now();
 
     switch ( type ) {
       case STREAM_JPEG :
@@ -451,14 +450,14 @@ bool MonitorStream::sendFrame(Image *image, const timeval &timestamp) {
     fputs("\r\n", stdout);
     fflush(stdout);
 
-    struct timeval frameEndTime;
-    gettimeofday(&frameEndTime, nullptr);
+    TimePoint send_end_time = std::chrono::steady_clock::now();
+    Milliseconds frame_send_time = std::chrono::duration_cast<Milliseconds>(send_end_time - send_start_time);
 
-    int frameSendTime = tvDiffMsec(frameStartTime, frameEndTime);
-    if ( frameSendTime > 1000/maxfps ) {
+    if (frame_send_time > Milliseconds(lround(Milliseconds::period::den / maxfps))) {
       maxfps /= 1.5;
-      Warning("Frame send time %d msec too slow, throttling maxfps to %.2f",
-          frameSendTime, maxfps);
+      Warning("Frame send time %" PRIi64 " msec too slow, throttling maxfps to %.2f",
+              static_cast<int64>(frame_send_time.count()),
+              maxfps);
     }
   }  // Not mpeg
   last_frame_sent = TV_2_FLOAT(now);
diff --git a/src/zm_rtp_source.cpp b/src/zm_rtp_source.cpp
index 2fd5bc41b..0d9330f8e 100644
--- a/src/zm_rtp_source.cpp
+++ b/src/zm_rtp_source.cpp
@@ -67,11 +67,11 @@ RtpSource::RtpSource(
   mRtpFactor = mRtpClock;
 
   mBaseTimeReal = tvNow();
-  mBaseTimeNtp = tvZero();
+  mBaseTimeNtp = {};
   mBaseTimeRtp = rtpTime;
 
-  mLastSrTimeReal = tvZero();
-  mLastSrTimeNtp = tvZero();
+  mLastSrTimeReal = {};
+  mLastSrTimeNtp = {};
   mLastSrTimeRtp = 0;
 
   if ( mCodecId != AV_CODEC_ID_H264 && mCodecId != AV_CODEC_ID_MPEG4 )
@@ -160,12 +160,18 @@ bool RtpSource::updateSeq(uint16_t seq) {
 
 void RtpSource::updateJitter( const RtpDataHeader *header ) {
   if ( mRtpFactor > 0 ) {
-    uint32_t localTimeRtp = mBaseTimeRtp + uint32_t(tvDiffSec(mBaseTimeReal) * mRtpFactor);
+    timeval now = {};
+    gettimeofday(&now, nullptr);
+
+    FPSeconds time_diff =
+        zm::chrono::duration_cast<Microseconds>(now) - zm::chrono::duration_cast<Microseconds>(mBaseTimeReal);
+
+    uint32_t localTimeRtp = mBaseTimeRtp + static_cast<uint32>(time_diff.count() * mRtpFactor);
     uint32_t packetTransit = localTimeRtp - ntohl(header->timestampN);
 
     Debug(5,
           "Delta rtp = %.6f\n Local RTP time = %x Packet RTP time = %x Packet transit RTP time = %x",
-          tvDiffSec(mBaseTimeReal),
+          time_diff.count(),
           localTimeRtp,
           ntohl(header->timestampN),
           packetTransit);
@@ -190,7 +196,8 @@ void RtpSource::updateRtcpData(
     uint32_t ntpTimeSecs,
     uint32_t ntpTimeFrac,
     uint32_t rtpTime) {
-  struct timeval ntpTime = tvMake(ntpTimeSecs, suseconds_t((USEC_PER_SEC*(ntpTimeFrac>>16))/(1<<16)));
+  timeval ntpTime = zm::chrono::duration_cast<timeval>(
+      Seconds(ntpTimeSecs) + Microseconds((Microseconds::period::den * (ntpTimeFrac >> 16)) / (1 << 16)));
 
   Debug(5, "ntpTime: %ld.%06ld, rtpTime: %x", ntpTime.tv_sec, ntpTime.tv_usec, rtpTime);
 
@@ -204,12 +211,14 @@ void RtpSource::updateRtcpData(
         mLastSrTimeNtp.tv_sec, mLastSrTimeNtp.tv_usec, rtpTime,
         ntpTime.tv_sec, ntpTime.tv_usec, rtpTime);
 
-    double diffNtpTime = tvDiffSec( mBaseTimeNtp, ntpTime );
+    FPSeconds diffNtpTime =
+        zm::chrono::duration_cast<Microseconds>(ntpTime) - zm::chrono::duration_cast<Microseconds>(mBaseTimeNtp);
+
     uint32_t diffRtpTime = rtpTime - mBaseTimeRtp;
-    mRtpFactor = (uint32_t)(diffRtpTime / diffNtpTime);
+    mRtpFactor = static_cast<uint32>(diffRtpTime / diffNtpTime.count());
 
     Debug( 5, "NTP-diff: %.6f RTP-diff: %d RTPfactor: %d",
-        diffNtpTime, diffRtpTime, mRtpFactor);
+        diffNtpTime.count(), diffRtpTime, mRtpFactor);
   }
   mLastSrTimeNtpSecs = ntpTimeSecs;
   mLastSrTimeNtpFrac = ntpTimeFrac;
diff --git a/src/zm_time.cpp b/src/zm_time.cpp
deleted file mode 100644
index 417ee2b2b..000000000
--- a/src/zm_time.cpp
+++ /dev/null
@@ -1,22 +0,0 @@
-//
-// ZoneMinder Time Functions & Definitions Implementation, $Date$, $Revision$
-// Copyright (C) 2001-2008 Philip Coombes
-// 
-// This program is free software; you can redistribute it and/or
-// modify it under the terms of the GNU General Public License
-// as published by the Free Software Foundation; either version 2
-// of the License, or (at your option) any later version.
-// 
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-// 
-// You should have received a copy of the GNU General Public License
-// along with this program; if not, write to the Free Software
-// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-// 
-
-#include "zm_time.h"
-
-// Blank
diff --git a/src/zm_time.h b/src/zm_time.h
index c5e7fe75e..d263dfb41 100644
--- a/src/zm_time.h
+++ b/src/zm_time.h
@@ -20,7 +20,6 @@
 #ifndef ZM_TIME_H
 #define ZM_TIME_H
 
-#include "zm_logger.h"
 #include <chrono>
 #include <sys/time.h>
 
@@ -51,137 +50,10 @@ struct DeltaTimeval
 
 #define DT_MAXGRAN    DT_GRAN_1000000
 
-#define USEC_PER_SEC 1000000
-#define MSEC_PER_SEC 1000
-
-/*
-extern struct timeval tv;
-*/
-
-inline int tvDiffUsec( struct timeval first, struct timeval last )
-{
-  return( (last.tv_sec - first.tv_sec) * USEC_PER_SEC) + ((USEC_PER_SEC + last.tv_usec - first.tv_usec) - USEC_PER_SEC );
-}
-
-inline int tvDiffUsec( struct timeval first )
-{
-  struct timeval now;
-  gettimeofday( &now, nullptr );
-  return( tvDiffUsec( first, now ) );
-}
-
-inline int tvDiffMsec( struct timeval first, struct timeval last )
-{
-  return( (last.tv_sec - first.tv_sec) * MSEC_PER_SEC) + (((MSEC_PER_SEC + last.tv_usec - first.tv_usec) / MSEC_PER_SEC) - MSEC_PER_SEC );
-}
-
-inline int tvDiffMsec( struct timeval first )
-{
-  struct timeval now;
-  gettimeofday( &now, nullptr );
-  return( tvDiffMsec( first, now ) );
-}
-
-inline double tvDiffSec( struct timeval first, struct timeval last )
-{
-  return( double(last.tv_sec - first.tv_sec) + double(((USEC_PER_SEC + last.tv_usec - first.tv_usec) - USEC_PER_SEC) / (1.0*USEC_PER_SEC) ) );
-}
-
-inline double tvDiffSec( struct timeval first )
-{
-  struct timeval now;
-  gettimeofday( &now, nullptr );
-  return( tvDiffSec( first, now ) );
-}
-
-inline struct timeval tvZero()
-{
-  struct timeval t = { 0, 0 };
-  return( t );
-}
-
-inline int tvIsZero( const struct timeval t )
-{
-  return( t.tv_sec == 0 && t.tv_usec == 0 );
-}
-
-inline int tvCmp( struct timeval t1, struct timeval t2 )
-{
-  if ( t1.tv_sec < t2.tv_sec )
-    return( -1 );
-  if ( t1.tv_sec > t2.tv_sec )
-    return( 1 );
-  if ( t1.tv_usec < t2.tv_usec )
-    return( -1 );
-  if ( t1.tv_usec > t2.tv_usec )
-    return( 1 );
-  return( 0 );
-}
-
-inline int tvEq( struct timeval t1, struct timeval t2 )
-{
-  return( t1.tv_sec == t2.tv_sec && t1.tv_usec == t2.tv_usec );
-}
-
-inline struct timeval tvNow( void )
-{
-  struct timeval t;
-  gettimeofday( &t, nullptr );
-  return( t );
-}
-
-inline struct timeval tvCheck( struct timeval &t )
-{
-  if ( t.tv_usec >= USEC_PER_SEC )
-  {
-    Warning( "Timestamp too large %ld.%ld\n", t.tv_sec, (long int) t.tv_usec );
-    t.tv_sec += t.tv_usec / USEC_PER_SEC;
-    t.tv_usec %= USEC_PER_SEC;
-  }
-  else if ( t.tv_usec < 0 )
-  {
-    Warning( "Got negative timestamp %ld.%ld\n", t.tv_sec, (long int)t.tv_usec );
-    t.tv_usec = 0;
-  }
-  return( t );
-}
-
-// Add t2 to t1
-inline struct timeval tvAdd( struct timeval t1, struct timeval t2 )
-{
-  tvCheck(t1);
-  tvCheck(t2);
-  t1.tv_sec += t2.tv_sec;
-  t1.tv_usec += t2.tv_usec;
-  if ( t1.tv_usec >= USEC_PER_SEC )
-  {
-    t1.tv_sec++;
-    t1.tv_usec -= USEC_PER_SEC;
-  }
-  return( t1 );
-}
-
-// Subtract t2 from t1
-inline struct timeval tvSub( struct timeval t1, struct timeval t2 )
-{
-  tvCheck(t1);
-  tvCheck(t2);
-  t1.tv_sec -= t2.tv_sec;
-  t1.tv_usec -= t2.tv_usec;
-  if ( t1.tv_usec < 0 )
-  {
-    t1.tv_sec--;
-    t1.tv_usec += USEC_PER_SEC;
-  }
-  return( t1 ) ;
-}
-
-inline struct timeval tvMake( time_t sec, suseconds_t usec )
-{
-  struct timeval t;
-  t.tv_sec = sec;
-  t.tv_usec = usec;
-  return( t );
+inline struct timeval tvNow() {
+  timeval t = {};
+  gettimeofday(&t, nullptr);
+  return t;
 }
 
 typedef std::chrono::microseconds Microseconds;
@@ -190,6 +62,9 @@ typedef std::chrono::seconds Seconds;
 typedef std::chrono::minutes Minutes;
 typedef std::chrono::hours Hours;
 
+// floating point seconds
+typedef std::chrono::duration<double> FPSeconds;
+
 typedef std::chrono::steady_clock::time_point TimePoint;
 typedef std::chrono::system_clock::time_point SystemTimePoint;