diff --git a/check_systemd_timer.py b/check_systemd_timer.py
index 149b947..e475a59 100755
--- a/check_systemd_timer.py
+++ b/check_systemd_timer.py
@@ -35,11 +35,12 @@ def check_timer(timer_name):
                 local_timezone_offset = timedelta(seconds=local_timezone_offset_seconds)
                 local_datetime = datetime.utcfromtimestamp(int(next_elapse) / 1e6) + local_timezone_offset
                 next_elapse_str = local_datetime.strftime("%m-%d-%Y %H:%M")
-            except Exception as e:
-                print(f'UNKNOWN - exception "{e}"')
-                print('next_elapse:', next_elapse)
-                traceback.print_exc()
-                sys.exit(nagios.STATE_UNKNOWN)
+            except ValueError as e:
+                if 'is out of range' in repr(e):
+                    # This occurs whenever the timer resets.
+                    # "year 586524 is out of range"
+                    print(f'OK - {timer_name} has triggered.')
+                    sys.exit(nagios.STATE_OK)
 
             current_time = time.time() * 1e6  # convert current time to microseconds
             remaining_time_sec = int((next_elapse - current_time) / 1e6)  # convert remaining time to seconds