diff --git a/homeassistant/bootstrap.py b/homeassistant/bootstrap.py
index 0b7dbe370be..4d69698f252 100644
--- a/homeassistant/bootstrap.py
+++ b/homeassistant/bootstrap.py
@@ -4,7 +4,7 @@ import logging
 import logging.handlers
 import os
 import sys
-from time import time
+from time import monotonic
 from typing import Any, Dict, Optional, Set
 
 import voluptuous as vol
@@ -110,7 +110,7 @@ async def async_from_config_dict(
     Dynamically loads required components and its dependencies.
     This method is a coroutine.
     """
-    start = time()
+    start = monotonic()
 
     core_config = config.get(core.DOMAIN, {})
 
@@ -131,7 +131,7 @@ async def async_from_config_dict(
 
     await _async_set_up_integrations(hass, config)
 
-    stop = time()
+    stop = monotonic()
     _LOGGER.info("Home Assistant initialized in %.2fs", stop - start)
 
     if REQUIRED_NEXT_PYTHON_DATE and sys.version_info[:3] < REQUIRED_NEXT_PYTHON_VER:
diff --git a/homeassistant/components/bme680/sensor.py b/homeassistant/components/bme680/sensor.py
index 65c87890242..43430f724bb 100644
--- a/homeassistant/components/bme680/sensor.py
+++ b/homeassistant/components/bme680/sensor.py
@@ -1,7 +1,7 @@
 """Support for BME680 Sensor over SMBus."""
 import logging
 import threading
-from time import sleep, time
+from time import monotonic, sleep
 
 import bme680  # pylint: disable=import-error
 from smbus import SMBus  # pylint: disable=import-error
@@ -240,15 +240,15 @@ class BME680Handler:
         # Pause to allow initial data read for device validation.
         sleep(1)
 
-        start_time = time()
-        curr_time = time()
+        start_time = monotonic()
+        curr_time = monotonic()
         burn_in_data = []
 
         _LOGGER.info(
             "Beginning %d second gas sensor burn in for Air Quality", burn_in_time
         )
         while curr_time - start_time < burn_in_time:
-            curr_time = time()
+            curr_time = monotonic()
             if self._sensor.get_sensor_data() and self._sensor.data.heat_stable:
                 gas_resistance = self._sensor.data.gas_resistance
                 burn_in_data.append(gas_resistance)
diff --git a/homeassistant/components/doods/image_processing.py b/homeassistant/components/doods/image_processing.py
index 9525f9e8ddf..65a32938140 100644
--- a/homeassistant/components/doods/image_processing.py
+++ b/homeassistant/components/doods/image_processing.py
@@ -285,7 +285,7 @@ class Doods(ImageProcessingEntity):
             )
 
         # Run detection
-        start = time.time()
+        start = time.monotonic()
         response = self._doods.detect(
             image, dconfig=self._dconfig, detector_name=self._detector_name
         )
@@ -293,7 +293,7 @@ class Doods(ImageProcessingEntity):
             "doods detect: %s response: %s duration: %s",
             self._dconfig,
             response,
-            time.time() - start,
+            time.monotonic() - start,
         )
 
         matches = {}
diff --git a/homeassistant/components/maxcube/__init__.py b/homeassistant/components/maxcube/__init__.py
index 1b65cb161e1..3e6ecbc948b 100644
--- a/homeassistant/components/maxcube/__init__.py
+++ b/homeassistant/components/maxcube/__init__.py
@@ -90,14 +90,14 @@ class MaxCubeHandle:
         self.cube = cube
         self.scan_interval = scan_interval
         self.mutex = Lock()
-        self._updatets = time.time()
+        self._updatets = time.monotonic()
 
     def update(self):
         """Pull the latest data from the MAX! Cube."""
         # Acquire mutex to prevent simultaneous update from multiple threads
         with self.mutex:
             # Only update every update_interval
-            if (time.time() - self._updatets) >= self.scan_interval:
+            if (time.monotonic() - self._updatets) >= self.scan_interval:
                 _LOGGER.debug("Updating")
 
                 try:
@@ -106,6 +106,6 @@ class MaxCubeHandle:
                     _LOGGER.error("Max!Cube connection failed")
                     return False
 
-                self._updatets = time.time()
+                self._updatets = time.monotonic()
             else:
                 _LOGGER.debug("Skipping update")
diff --git a/homeassistant/components/netatmo/sensor.py b/homeassistant/components/netatmo/sensor.py
index afdb7c053f3..818662ee69c 100644
--- a/homeassistant/components/netatmo/sensor.py
+++ b/homeassistant/components/netatmo/sensor.py
@@ -1,7 +1,6 @@
 """Support for the Netatmo Weather Service."""
 from datetime import timedelta
 import logging
-from time import time
 
 import pyatmo
 
@@ -519,7 +518,6 @@ class NetatmoData:
         """Initialize the data object."""
         self.data = {}
         self.station_data = station_data
-        self._next_update = time()
         self.auth = auth
 
     def get_module_infos(self):
diff --git a/homeassistant/components/proxmoxve/__init__.py b/homeassistant/components/proxmoxve/__init__.py
index 58cb50ee304..315fb8b1c91 100644
--- a/homeassistant/components/proxmoxve/__init__.py
+++ b/homeassistant/components/proxmoxve/__init__.py
@@ -147,12 +147,12 @@ class ProxmoxClient:
             verify_ssl=self._verify_ssl,
         )
 
-        self._connection_start_time = time.time()
+        self._connection_start_time = time.monotonic()
 
     def get_api_client(self):
         """Return the ProxmoxAPI client and rebuild it if necessary."""
 
-        connection_age = time.time() - self._connection_start_time
+        connection_age = time.monotonic() - self._connection_start_time
 
         # Workaround for the Proxmoxer bug where the connection stops working after some time
         if connection_age > 30 * 60:
diff --git a/homeassistant/components/verisure/lock.py b/homeassistant/components/verisure/lock.py
index 01eb5faf897..5b5d50347ac 100644
--- a/homeassistant/components/verisure/lock.py
+++ b/homeassistant/components/verisure/lock.py
@@ -1,6 +1,6 @@
 """Support for Verisure locks."""
 import logging
-from time import sleep, time
+from time import monotonic, sleep
 
 from homeassistant.components.lock import LockDevice
 from homeassistant.const import ATTR_CODE, STATE_LOCKED, STATE_UNLOCKED
@@ -71,7 +71,7 @@ class VerisureDoorlock(LockDevice):
 
     def update(self):
         """Update lock status."""
-        if time() - self._change_timestamp < 10:
+        if monotonic() - self._change_timestamp < 10:
             return
         hub.update_overview()
         status = hub.get_first(
@@ -131,4 +131,4 @@ class VerisureDoorlock(LockDevice):
             transaction = hub.session.get_lock_state_transaction(transaction_id)
         if transaction["result"] == "OK":
             self._state = state
-            self._change_timestamp = time()
+            self._change_timestamp = monotonic()
diff --git a/homeassistant/components/verisure/switch.py b/homeassistant/components/verisure/switch.py
index 32e1c1364a3..2df250303c5 100644
--- a/homeassistant/components/verisure/switch.py
+++ b/homeassistant/components/verisure/switch.py
@@ -1,6 +1,6 @@
 """Support for Verisure Smartplugs."""
 import logging
-from time import time
+from time import monotonic
 
 from homeassistant.components.switch import SwitchDevice
 
@@ -44,7 +44,7 @@ class VerisureSmartplug(SwitchDevice):
     @property
     def is_on(self):
         """Return true if on."""
-        if time() - self._change_timestamp < 10:
+        if monotonic() - self._change_timestamp < 10:
             return self._state
         self._state = (
             hub.get_first(
@@ -67,13 +67,13 @@ class VerisureSmartplug(SwitchDevice):
         """Set smartplug status on."""
         hub.session.set_smartplug_state(self._device_label, True)
         self._state = True
-        self._change_timestamp = time()
+        self._change_timestamp = monotonic()
 
     def turn_off(self, **kwargs):
         """Set smartplug status off."""
         hub.session.set_smartplug_state(self._device_label, False)
         self._state = False
-        self._change_timestamp = time()
+        self._change_timestamp = monotonic()
 
     # pylint: disable=no-self-use
     def update(self):