Use job creation date when returning backend properties in job.properties()

qiskit_ibm_provider/job/ibm_composite_job.py

@@ -374,16 +374,13 @@ def _async_submit(self, sub_job: SubJob) -> None:
 
     @_requires_submit
     def properties(
-        self, refresh: bool = False, datetime: Optional[python_datetime] = None
+        self, refresh: bool = False
     ) -> Optional[Union[List[BackendProperties], BackendProperties]]:
         """Return the backend properties for this job.
 
          Args:
             refresh: If ``True``, re-query the server for the backend properties.
                 Otherwise, return a cached version.
-            datetime: By specifying `datetime`, this function returns an instance
-                of the :class:`BackendProperties<qiskit.providers.models.BackendProperties>`
-                whose timestamp is closest to, but older than, the specified `datetime`.
 
         Note:
             This method blocks until all sub-jobs are submitted.
@@ -401,7 +398,7 @@ def properties(
             self._properties = []
             properties_ts = []
             for job in self._get_circuit_jobs():
-                props = job.properties(refresh, datetime)
+                props = job.properties(refresh)
                 if props.last_update_date not in properties_ts:
                     self._properties.append(props)
                     properties_ts.append(props.last_update_date)

qiskit_ibm_provider/job/ibm_job.py

@@ -68,23 +68,18 @@ def __init__(
             # Append suffix to key to avoid conflicts.
             self._data[key + "_"] = value
 
-    def properties(
-        self, refresh: bool = False, datetime: Optional[python_datetime] = None
-    ) -> Optional[BackendProperties]:
+    def properties(self, refresh: bool = False) -> Optional[BackendProperties]:
         """Return the backend properties for this job.
 
         Args:
             refresh: If ``True``, re-query the server for the backend properties.
                 Otherwise, return a cached version.
-            datetime: By specifying `datetime`, this function returns an instance
-                of the :class:`BackendProperties<qiskit.providers.models.BackendProperties>`
-                whose timestamp is closest to, but older than, the specified `datetime`.
 
         Returns:
-            The backend properties used for this job, or ``None`` if
-            properties are not available.
+            The backend properties used for this job, at the time the job was run,
+            or ``None`` if properties are not available.
         """
-        return self._backend.properties(refresh, datetime)
+        return self._backend.properties(refresh, self.creation_date())
 
     @abstractmethod
     def result(

releasenotes/notes/job-properties-creation-date-658a3ad4bfcb923b.yaml

@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    When retrieving the backend properties of a job with 
+    :meth:`~qiskit_ibm_provider.job.IBMJob.properties`, the job creation date is now
+    used to get the specific backend properties used when the job was run.
+