diff --git a/puppet/zulip/files/postgresql/pg_backup_and_purge b/puppet/zulip/files/postgresql/pg_backup_and_purge
index cc3aba0198..21252cf729 100755
--- a/puppet/zulip/files/postgresql/pg_backup_and_purge
+++ b/puppet/zulip/files/postgresql/pg_backup_and_purge
@@ -8,10 +8,12 @@ import sys
 import logging
 import dateutil.parser
 import pytz
+import time
 from datetime import datetime, timedelta
 if False:
     from typing import Dict, List
 
+logging.Formatter.converter = time.gmtime
 logging.basicConfig(format="%(asctime)s %(levelname)s: %(message)s")
 logger = logging.getLogger(__name__)
 
diff --git a/puppet/zulip/files/postgresql/process_fts_updates b/puppet/zulip/files/postgresql/process_fts_updates
index 66b6e640da..de0ae3f9b8 100755
--- a/puppet/zulip/files/postgresql/process_fts_updates
+++ b/puppet/zulip/files/postgresql/process_fts_updates
@@ -52,6 +52,7 @@ def am_master(cursor):
     cursor.execute("SELECT pg_is_in_recovery()")
     return not cursor.fetchall()[0][0]
 
+logging.Formatter.converter = time.gmtime
 logging.basicConfig(format="%(asctime)s %(levelname)s: %(message)s")
 logger = logging.getLogger("process_fts_updates")
 logger.setLevel(logging.DEBUG)
diff --git a/scripts/lib/upgrade-zulip b/scripts/lib/upgrade-zulip
index 0b93af874a..c369eaaa3c 100755
--- a/scripts/lib/upgrade-zulip
+++ b/scripts/lib/upgrade-zulip
@@ -4,6 +4,7 @@ import shutil
 import sys
 import subprocess
 import logging
+import time
 
 TARBALL_ARCHIVE_PATH = "/home/zulip/archives"
 os.environ["PYTHONUNBUFFERED"] = "y"
@@ -12,6 +13,7 @@ sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..'))
 from scripts.lib.zulip_tools import DEPLOYMENTS_DIR, FAIL, WARNING, ENDC, \
     su_to_zulip, get_deployment_lock, release_deployment_lock
 
+logging.Formatter.converter = time.gmtime
 logging.basicConfig(format="%(asctime)s upgrade-zulip: %(message)s",
                     level=logging.INFO)
 
diff --git a/scripts/lib/upgrade-zulip-stage-2 b/scripts/lib/upgrade-zulip-stage-2
index 5feef85632..9b16acc442 100755
--- a/scripts/lib/upgrade-zulip-stage-2
+++ b/scripts/lib/upgrade-zulip-stage-2
@@ -9,6 +9,7 @@ import subprocess
 import os
 import sys
 import logging
+import time
 
 os.environ["PYTHONUNBUFFERED"] = "y"
 
@@ -20,6 +21,7 @@ os.environ["LANGUAGE"] = "en_US.UTF-8"
 sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..'))
 from scripts.lib.zulip_tools import DEPLOYMENTS_DIR, FAIL, WARNING, ENDC, su_to_zulip
 
+logging.Formatter.converter = time.gmtime
 logging.basicConfig(format="%(asctime)s upgrade-zulip-stage-2: %(message)s",
                     level=logging.INFO)
 
diff --git a/scripts/restart-server b/scripts/restart-server
index b0c5274eb6..46c9654bba 100755
--- a/scripts/restart-server
+++ b/scripts/restart-server
@@ -9,6 +9,7 @@ import time
 sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
 from scripts.lib.zulip_tools import ENDC, OKGREEN, DEPLOYMENTS_DIR
 
+logging.Formatter.converter = time.gmtime
 logging.basicConfig(format="%(asctime)s restart-server: %(message)s",
                     level=logging.INFO)
 
diff --git a/scripts/upgrade-zulip-from-git b/scripts/upgrade-zulip-from-git
index 0b6258419f..838172e964 100755
--- a/scripts/upgrade-zulip-from-git
+++ b/scripts/upgrade-zulip-from-git
@@ -4,6 +4,7 @@ import configparser
 import sys
 import subprocess
 import logging
+import time
 
 config_file = configparser.RawConfigParser()
 config_file.read("/etc/zulip/zulip.conf")
@@ -24,6 +25,7 @@ sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
 from scripts.lib.zulip_tools import DEPLOYMENTS_DIR, FAIL, WARNING, ENDC, make_deploy_path, \
     get_deployment_lock, release_deployment_lock, su_to_zulip
 
+logging.Formatter.converter = time.gmtime
 logging.basicConfig(format="%(asctime)s upgrade-zulip-from-git: %(message)s",
                     level=logging.INFO)
 
diff --git a/zerver/lib/notifications.py b/zerver/lib/notifications.py
index 646484b38e..3d6c26d91c 100644
--- a/zerver/lib/notifications.py
+++ b/zerver/lib/notifications.py
@@ -465,6 +465,8 @@ def clear_scheduled_emails(user_id: int, email_type: Optional[int]=None) -> None
 
 def log_digest_event(msg: str) -> None:
     import logging
+    import time
+    logging.Formatter.converter = time.gmtime
     logging.basicConfig(filename=settings.DIGEST_LOG_PATH, level=logging.INFO)
     logging.info(msg)