diff --git a/fetchmail-errors b/fetchmail-errors
index 832262d..76bf8a5 100755
--- a/fetchmail-errors
+++ b/fetchmail-errors
@@ -5,7 +5,7 @@ import datetime
 import systemd.journal as journal
 
 
-yesterday = datetime.datetime.today() - datetime.timedelta(1)
+yesterday = datetime.datetime.now(tz=datetime.timezone.utc) - datetime.timedelta(1)
 SINCE = yesterday
 MINCOUNT = 20
 
@@ -14,7 +14,6 @@ j = journal.Reader()
 j.log_level(journal.LOG_ERR)  # or more severe
 j.add_match(_COMM="fetchmail")
 
-
 entries = [entry for entry in j
            # j.seek_realtime() does not work as expected, so filtering here:
            if entry['_SOURCE_REALTIME_TIMESTAMP'] >= SINCE]