Calibrations tutorial

qiskit_experiments/calibration_management/calibrations.py

@@ -14,7 +14,7 @@
 
 import os
 from collections import defaultdict
-from datetime import datetime
+from datetime import datetime, timezone
 from typing import Any, Dict, Set, Tuple, Union, List, Optional
 import csv
 import dataclasses
@@ -380,7 +380,7 @@ def add_parameter_value(
         qubits = self._to_tuple(qubits)
 
         if isinstance(value, (int, float, complex)):
-            value = ParameterValue(value, datetime.now())
+            value = ParameterValue(value, datetime.now(timezone.utc))
 
         param_name = param.name if isinstance(param, Parameter) else param
         sched_name = schedule.name if isinstance(schedule, ScheduleBlock) else schedule

qiskit_experiments/calibration_management/update_library.py

@@ -13,7 +13,7 @@
 """A library of experiment calibrations."""
 
 from abc import ABC
-from datetime import datetime
+from datetime import datetime, timezone
 from typing import List, Optional, Tuple, Union
 import numpy as np
 
@@ -58,7 +58,7 @@ def _time_stamp(exp_data: ExperimentData) -> datetime:
         if all_times:
             return max(all_times)
 
-        return datetime.now()
+        return datetime.now(timezone.utc)
 
     @classmethod
     def _add_parameter_value(

qiskit_experiments/database_service/utils.py

@@ -86,7 +86,9 @@ def plot_to_svg_bytes(figure: "pyplot.Figure") -> bytes:
     buf = io.BytesIO()
     opaque_color = list(figure.get_facecolor())
     opaque_color[3] = 1.0  # set alpha to opaque
-    figure.savefig(buf, format="svg", facecolor=tuple(opaque_color), edgecolor="none")
+    figure.savefig(
+        buf, format="svg", facecolor=tuple(opaque_color), edgecolor="none", bbox_inches="tight"
+    )
     buf.seek(0)
     figure_data = buf.read()
     buf.close()

qiskit_experiments/test/utils.py

@@ -14,7 +14,7 @@
 
 import uuid
 from typing import Optional, Union, Dict
-from datetime import datetime
+from datetime import datetime, timezone
 import time
 
 from qiskit.providers.job import JobV1 as Job
@@ -45,7 +45,7 @@ def submit(self):
     @staticmethod
     def time_per_step() -> Dict[str, datetime]:
         """Return the completion time."""
-        return {"COMPLETED": datetime.now()}
+        return {"COMPLETED": datetime.now(timezone.utc)}
 
     def status(self) -> JobStatus:
         """Return the status of the job, among the values of ``JobStatus``."""