diff --git a/scripts/add_realtime.py b/scripts/add_realtime.py
new file mode 100644
index 0000000..207bada
--- /dev/null
+++ b/scripts/add_realtime.py
@@ -0,0 +1,57 @@
+#!/usr/bin/env python3
+
+# Copyright 2023 Red Hat, Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This is a helper script, that adds realtime fields to a local JSON file.
+# It probably will need some customization for each run
+
+import argparse
+import json
+import sys
+from datetime import datetime, date, time, timedelta
+
+try:
+    from pytz import ZoneInfo as timezone
+except Exception:
+    from pytz import timezone
+
+
+UTC = timezone('UTC')
+parser = argparse.ArgumentParser()
+parser.add_argument('src_file', metavar='<ptg schedule JSON>')
+parser.add_argument('--tz', dest='dst_TZ', default='UTC')
+parser.add_argument('--event-date', dest='event_date', default='2023-06-10')
+args = parser.parse_args()
+
+with open(args.src_file) as f:
+    db = json.load(f)
+
+dst_TZ = timezone(args.dst_TZ)
+(year, month, day) = args.event_date.split('-')
+event_date = date(int(year), int(month), int(day))
+
+for day in db['slots']:
+    print(day + ":", file=sys.stderr)
+    for slot in db['slots'][day]:
+        idx = slot['desc'].index('-')
+        (hours, mins) = slot['desc'][:idx].split(':')
+        realtime = datetime.combine(event_date, time(int(hours), int(mins), 0,
+                                                     tzinfo=dst_TZ))
+        slot['realtime'] = realtime.astimezone(UTC).strftime("%Y-%m-%dT%H:%MZ")
+        print(slot, file=sys.stderr)
+    event_date += timedelta(days=1)
+    print("", file=sys.stderr)
+
+print(json.dumps(db), file=sys.stdout)