What are the best remembrances (dhikr) and the best times [for them]?

The best remembrance (dhikr) is the saying: "There is no god but Allah" (La ilaha illa Allah). Among the best remembrances also are "Glory be to Allah" (Subhanallah), "Praise be to Allah" (Alhamdulillah), and "Allah is the Greatest" (Allahu Akbar). As for the best times for remembrance in general, it is the last third of the night. However, if the intention is to ask about the best times for remembrances restricted to a specific time, then it is the two ends of the day.