diff --git a/openhtf/core/measurements.py b/openhtf/core/measurements.py
index e8cfd36d8..9dbbc5a6e 100644
--- a/openhtf/core/measurements.py
+++ b/openhtf/core/measurements.py
@@ -63,6 +63,7 @@ def WidgetTestPhase(test):
 import enum
 import functools
 import logging
+import time
 import typing
 from typing import Any, Callable, Dict, Iterator, List, Optional, Text, Tuple, Union
 
@@ -189,6 +190,7 @@ class Measurement(object):
     outcome: One of the Outcome() enumeration values, starting at UNSET.
     marginal: A bool flag indicating if this measurement is marginal if the
       outcome is PASS.
+    set_time_millis: The time the measurement is set in milliseconds.
     _cached: A cached dict representation of this measurement created initially
       during as_base_types and updated in place to save allocation time.
   """
@@ -214,6 +216,7 @@ class Measurement(object):
   _notification_cb = attr.ib(type=Optional[Callable[[], None]], default=None)
   outcome = attr.ib(type=Outcome, default=Outcome.UNSET)
   marginal = attr.ib(type=bool, default=False)
+  set_time_millis = attr.ib(type=int, default=None)
 
   # Runtime cache to speed up conversions.
   _cached = attr.ib(type=Optional[Dict[Text, Any]], default=None)
@@ -845,6 +848,7 @@ def __setitem__(self, name: Text, value: Any) -> None:
           'Cannot set dimensioned measurement without indices')
     m.measured_value.set(value)
     m.notify_value_set()
+    m.set_time_millis = util.time_millis()
 
   def __getitem__(self, name: Text) -> Any:
     self._assert_valid_key(name)
diff --git a/test/core/diagnoses_test.py b/test/core/diagnoses_test.py
index 25814dfec..79a9aa0e1 100644
--- a/test/core/diagnoses_test.py
+++ b/test/core/diagnoses_test.py
@@ -1164,6 +1164,7 @@ def check_record_diagnoser(phase_record):
                   is_value_set=True,
                   stored_value=True,
                   cached_value=True),
+              set_time_millis=phase_record.measurements['pass_measure'].set_time_millis,
               cached=mock.ANY), phase_record.measurements['pass_measure'])
       self.assertEqual(
           htf.Measurement(
@@ -1175,6 +1176,7 @@ def check_record_diagnoser(phase_record):
                   stored_value=False,
                   cached_value=False),
               validators=[is_true],
+              set_time_millis=phase_record.measurements['fail_measure'].set_time_millis,
               cached=mock.ANY), phase_record.measurements['fail_measure'])
       return None