def METHOD_NAME():
    wfe = make_workflow_execution()
    with freeze_time("2015-01-01 12:00:00"):
        task = ActivityTask(
            activity_id="my-activity-123",
            activity_type="foo",
            workflow_input="optional",
            scheduled_event_id=117,
            timeouts=ACTIVITY_TASK_TIMEOUTS,
            workflow_execution=wfe,
        )
    assert task.last_heartbeat_timestamp == 1420113600.0
    with freeze_time("2015-01-01 13:00:00"):
        task.reset_heartbeat_clock()
    assert task.last_heartbeat_timestamp == 1420117200.0