diff --git a/src/dicognito/datetimeanonymizer.py b/src/dicognito/datetimeanonymizer.py
index ba7ad8e..14ccade 100644
--- a/src/dicognito/datetimeanonymizer.py
+++ b/src/dicognito/datetimeanonymizer.py
@@ -53,7 +53,11 @@ class DateTimeAnonymizer:
             dates = [data_element.value]
 
         times = []
-        time_name = data_element.keyword[:-4] + "Time"
+        if data_element.keyword.endswith("Date"):
+            time_name = data_element.keyword[:-4] + "Time"
+        elif data_element.keyword.startswith("Date"):
+            time_name = "Time" + data_element.keyword[4:]
+
         if time_name in dataset:
             time_value = dataset.data_element(time_name).value
             if time_value:
diff --git a/src/dicognito/release_notes.md b/src/dicognito/release_notes.md
index 2e4d91d..b894047 100644
--- a/src/dicognito/release_notes.md
+++ b/src/dicognito/release_notes.md
@@ -1,5 +1,9 @@
-## 0.8.0
-
+### Fixed
+
+- Fails to anonymize TimeOfLastCalibration ([#66](https://github.com/blairconrad/dicognito/issues/66))
+
+## 0.8.0
+
 ### Changed
 
 - Drop support for Python 2.7 ([#63](https://github.com/blairconrad/dicognito/issues/63))

diff --git a/tests/test_anonymize_single_instance.py b/tests/test_anonymize_single_instance.py
index 74b7aef..567e996 100644
--- a/tests/test_anonymize_single_instance.py
+++ b/tests/test_anonymize_single_instance.py
@@ -440,16 +440,16 @@ def test_multivalued_date_and_time_pair_gets_anonymized():
         dataset.DateOfLastCalibration = original_date = ["20010401", "20010402"]
         dataset.TimeOfLastCalibration = original_time = ["120000", "135959"]
 
-        anonymizer = Anonymizer()
+        anonymizer = Anonymizer(seed="")
         anonymizer.anonymize(dataset)
 
-        new_date_string = dataset.DateOfLastCalibration
-        new_time_string = dataset.TimeOfLastCalibration
+        new_date = dataset.DateOfLastCalibration
+        new_time = dataset.TimeOfLastCalibration
 
-    assert new_date_string != original_date
-    assert len(new_date_string) == len(original_date)
-    assert new_time_string[2:] == original_time[2:]
-    assert len(new_time_string) == len(original_time)
+    assert new_date != original_date
+    assert len(new_date) == len(original_date)
+    assert new_time != original_time
+    assert len(new_time) == len(original_time)
 
 
 @pytest.mark.parametrize(

Fails to anonymize TimeOfLastCalibration
because we expect to find "Date" and "Time" at the _end_ of the element name.
tests/test_anonymize_single_instance.py::test_multivalued_date_and_time_pair_gets_anonymized
tests/test_anonymize_single_instance.py::test_minimal_instance_anonymizes_safely tests/test_anonymize_single_instance.py::test_nonidentifying_uis_are_left_alone[file_meta.MediaStorageSOPClassUID] tests/test_anonymize_single_instance.py::test_nonidentifying_uis_are_left_alone[file_meta.TransferSyntaxUID] tests/test_anonymize_single_instance.py::test_nonidentifying_uis_are_left_alone[file_meta.ImplementationClassUID] tests/test_anonymize_single_instance.py::test_nonidentifying_uis_are_left_alone[SOPClassUID] tests/test_anonymize_single_instance.py::test_nonidentifying_uis_are_left_alone[SourceImageSequence[0].ReferencedSOPClassUID] tests/test_anonymize_single_instance.py::test_identifying_uis_are_updated[file_meta.MediaStorageSOPInstanceUID] tests/test_anonymize_single_instance.py::test_identifying_uis_are_updated[SOPInstanceUID] tests/test_anonymize_single_instance.py::test_identifying_uis_are_updated[SourceImageSequence[0].ReferencedSOPInstanceUID] tests/test_anonymize_single_instance.py::test_identifying_uis_are_updated[StudyInstanceUID] tests/test_anonymize_single_instance.py::test_identifying_uis_are_updated[SeriesInstanceUID] tests/test_anonymize_single_instance.py::test_identifying_uis_are_updated[FrameOfReferenceUID] tests/test_anonymize_single_instance.py::test_repeated_identifying_uis_get_same_values[file_meta.MediaStorageSOPInstanceUID-SOPInstanceUID] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[AccessionNumber] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[FillerOrderNumberImagingServiceRequest] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[FillerOrderNumberImagingServiceRequestRetired] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[FillerOrderNumberProcedure] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[IssuerOfPatientID] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[OtherPatientIDs] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[OtherPatientIDsSequence[0].PatientID] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[OtherPatientIDsSequence[0].IssuerOfPatientID] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[OtherPatientIDsSequence[1].PatientID] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[OtherPatientIDsSequence[1].IssuerOfPatientID] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[PatientID] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[PerformedProcedureStepID] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[PlacerOrderNumberImagingServiceRequest] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[PlacerOrderNumberImagingServiceRequestRetired] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[PlacerOrderNumberProcedure] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[RequestAttributesSequence[0].RequestedProcedureID] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[RequestAttributesSequence[0].ScheduledProcedureStepID] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[ScheduledProcedureStepID] tests/test_anonymize_single_instance.py::test_ids_are_anonymized[StudyID] tests/test_anonymize_single_instance.py::test_other_patient_ids_anonymized_to_same_number_of_ids[2] tests/test_anonymize_single_instance.py::test_other_patient_ids_anonymized_to_same_number_of_ids[3] tests/test_anonymize_single_instance.py::test_issuer_of_patient_id_changed_if_not_empty tests/test_anonymize_single_instance.py::test_issuer_of_patient_id_not_added_if_empty tests/test_anonymize_single_instance.py::test_female_patient_name_gets_anonymized tests/test_anonymize_single_instance.py::test_male_patient_name_gets_anonymized tests/test_anonymize_single_instance.py::test_sex_other_patient_name_gets_anonymized tests/test_anonymize_single_instance.py::test_other_patient_names_anonymized_to_same_number_of_names[2] tests/test_anonymize_single_instance.py::test_other_patient_names_anonymized_to_same_number_of_names[3] tests/test_anonymize_single_instance.py::test_non_patient_names_get_anonymized[NameOfPhysiciansReadingStudy] tests/test_anonymize_single_instance.py::test_non_patient_names_get_anonymized[OperatorsName] tests/test_anonymize_single_instance.py::test_non_patient_names_get_anonymized[PatientBirthName] tests/test_anonymize_single_instance.py::test_non_patient_names_get_anonymized[PatientMotherBirthName] tests/test_anonymize_single_instance.py::test_non_patient_names_get_anonymized[PerformingPhysicianName] tests/test_anonymize_single_instance.py::test_non_patient_names_get_anonymized[ReferringPhysicianName] tests/test_anonymize_single_instance.py::test_non_patient_names_get_anonymized[RequestingPhysician] tests/test_anonymize_single_instance.py::test_non_patient_names_get_anonymized[ResponsiblePerson] tests/test_anonymize_single_instance.py::test_patient_address_gets_anonymized tests/test_anonymize_single_instance.py::test_extra_patient_attributes_are_removed[Occupation] tests/test_anonymize_single_instance.py::test_extra_patient_attributes_are_removed[PatientInsurancePlanCodeSequence] tests/test_anonymize_single_instance.py::test_extra_patient_attributes_are_removed[MilitaryRank] tests/test_anonymize_single_instance.py::test_extra_patient_attributes_are_removed[BranchOfService] tests/test_anonymize_single_instance.py::test_extra_patient_attributes_are_removed[PatientTelephoneNumbers] tests/test_anonymize_single_instance.py::test_extra_patient_attributes_are_removed[PatientTelecomInformation] tests/test_anonymize_single_instance.py::test_extra_patient_attributes_are_removed[PatientReligiousPreference] tests/test_anonymize_single_instance.py::test_extra_patient_attributes_are_removed[MedicalRecordLocator] tests/test_anonymize_single_instance.py::test_extra_patient_attributes_are_removed[ReferencedPatientPhotoSequence] tests/test_anonymize_single_instance.py::test_extra_patient_attributes_are_removed[ResponsibleOrganization] tests/test_anonymize_single_instance.py::test_equipment_gets_anonymized tests/test_anonymize_single_instance.py::test_requesting_service_gets_anonymized tests/test_anonymize_single_instance.py::test_current_patient_location_gets_anonymized tests/test_anonymize_single_instance.py::test_dates_and_times_get_anonymized_when_both_are_present[AcquisitionDate] tests/test_anonymize_single_instance.py::test_dates_and_times_get_anonymized_when_both_are_present[ContentDate] tests/test_anonymize_single_instance.py::test_dates_and_times_get_anonymized_when_both_are_present[InstanceCreationDate] tests/test_anonymize_single_instance.py::test_dates_and_times_get_anonymized_when_both_are_present[PatientBirthDate] tests/test_anonymize_single_instance.py::test_dates_and_times_get_anonymized_when_both_are_present[PerformedProcedureStepStartDate] tests/test_anonymize_single_instance.py::test_dates_and_times_get_anonymized_when_both_are_present[SeriesDate] tests/test_anonymize_single_instance.py::test_dates_and_times_get_anonymized_when_both_are_present[StudyDate] tests/test_anonymize_single_instance.py::test_date_gets_anonymized_when_there_is_no_time tests/test_anonymize_single_instance.py::test_date_gets_anonymized_when_date_has_various_lengths[20180202] tests/test_anonymize_single_instance.py::test_date_gets_anonymized_when_date_has_various_lengths[199901] tests/test_anonymize_single_instance.py::test_date_gets_anonymized_when_date_has_various_lengths[1983] tests/test_anonymize_single_instance.py::test_date_gets_anonymized_when_time_has_various_lengths[] tests/test_anonymize_single_instance.py::test_date_gets_anonymized_when_time_has_various_lengths[07] tests/test_anonymize_single_instance.py::test_date_gets_anonymized_when_time_has_various_lengths[0911] tests/test_anonymize_single_instance.py::test_date_gets_anonymized_when_time_has_various_lengths[131517] tests/test_anonymize_single_instance.py::test_date_gets_anonymized_when_time_has_various_lengths[192123.1] tests/test_anonymize_single_instance.py::test_date_gets_anonymized_when_time_has_various_lengths[192123.12] tests/test_anonymize_single_instance.py::test_date_gets_anonymized_when_time_has_various_lengths[192123.123] tests/test_anonymize_single_instance.py::test_date_gets_anonymized_when_time_has_various_lengths[192123.1234] tests/test_anonymize_single_instance.py::test_date_gets_anonymized_when_time_has_various_lengths[192123.12345] tests/test_anonymize_single_instance.py::test_date_gets_anonymized_when_time_has_various_lengths[192123.123456] tests/test_anonymize_single_instance.py::test_multivalued_date_with_no_time_pair_gets_anonymized tests/test_anonymize_single_instance.py::test_datetime_gets_anonymized[AcquisitionDateTime] tests/test_anonymize_single_instance.py::test_datetime_gets_anonymized[FrameReferenceDateTime] tests/test_anonymize_single_instance.py::test_datetime_gets_anonymized[FrameAcquisitionDateTime] tests/test_anonymize_single_instance.py::test_datetime_gets_anonymized[StartAcquisitionDateTime] tests/test_anonymize_single_instance.py::test_datetime_gets_anonymized[EndAcquisitionDateTime] tests/test_anonymize_single_instance.py::test_datetime_gets_anonymized[PerformedProcedureStepStartDateTime] tests/test_anonymize_single_instance.py::test_datetime_gets_anonymized[PerformedProcedureStepEndDateTime] tests/test_anonymize_single_instance.py::test_datetime_of_various_lengths_gets_anonymized[1947] tests/test_anonymize_single_instance.py::test_datetime_of_various_lengths_gets_anonymized[194711] tests/test_anonymize_single_instance.py::test_datetime_of_various_lengths_gets_anonymized[19471103] tests/test_anonymize_single_instance.py::test_datetime_of_various_lengths_gets_anonymized[1947110307] tests/test_anonymize_single_instance.py::test_datetime_of_various_lengths_gets_anonymized[194711030911] tests/test_anonymize_single_instance.py::test_datetime_of_various_lengths_gets_anonymized[19471103131517] tests/test_anonymize_single_instance.py::test_datetime_of_various_lengths_gets_anonymized[19471103192123.1] tests/test_anonymize_single_instance.py::test_datetime_of_various_lengths_gets_anonymized[19471103192123.12] tests/test_anonymize_single_instance.py::test_datetime_of_various_lengths_gets_anonymized[19471103192123.123] tests/test_anonymize_single_instance.py::test_datetime_of_various_lengths_gets_anonymized[19471103192123.1234] tests/test_anonymize_single_instance.py::test_datetime_of_various_lengths_gets_anonymized[19471103192123.12345] tests/test_anonymize_single_instance.py::test_datetime_of_various_lengths_gets_anonymized[19471103192123.123456] tests/test_anonymize_single_instance.py::test_multivalued_datetime_gets_anonymized tests/test_anonymize_single_instance.py::test_no_sex_still_changes_patient_name tests/test_anonymize_single_instance.py::test_deidentification_method_set_properly[None-DICOGNITO] tests/test_anonymize_single_instance.py::test_deidentification_method_set_properly[DICOGNITO-DICOGNITO] tests/test_anonymize_single_instance.py::test_deidentification_method_set_properly[SOMETHINGELSE-expected2] tests/test_anonymize_single_instance.py::test_deidentification_method_set_properly[SOMETHING\\SOMETHINGELSE-expected3] tests/test_anonymize_single_instance.py::test_deidentification_method_set_properly[DICOGNITO\\SOMETHINGELSE-expected4] tests/test_anonymize_single_instance.py::test_patient_identity_removed[None-None-None] tests/test_anonymize_single_instance.py::test_patient_identity_removed[None-YES-None] tests/test_anonymize_single_instance.py::test_patient_identity_removed[None-NO-YES] tests/test_anonymize_single_instance.py::test_patient_identity_removed[NO-None-NO] tests/test_anonymize_single_instance.py::test_patient_identity_removed[NO-YES-NO] tests/test_anonymize_single_instance.py::test_patient_identity_removed[NO-NO-YES] tests/test_anonymize_single_instance.py::test_patient_identity_removed[YES-None-YES] tests/test_anonymize_single_instance.py::test_patient_identity_removed[YES-YES-YES] tests/test_anonymize_single_instance.py::test_patient_identity_removed[YES-NO-YES]