Under Cal. Rules of Court 3.1700, 3.1702, the time to file a memorandum of costs and a motion for attorney fees runs from service of notice of entry of judgment.  That the prevailing party had actual knowledge of entry of judgment earlier is irrelevant.  It is service of notice of entry, not actual knowledge that starts the time running.  Likewise, the fact that the clerk mailed a copy of the judgment to the prevailing party–but without any accompanying proof of servicer–was also insufficient to start the time running for filing the memo of costs or attorney fee motion.