Yes — dates are safe and parrots adore them, but they're extremely high in sugar, so they're a small, occasional treat only.
Keeper's noteA pea-sized piece is a high-value training jackpot. Their stickiness also makes them a good (rare) medication-hiding vehicle.
What to watch out for with dates
Dates are non-toxic and even bring some fiber and potassium, but they're among the sugariest foods you can offer — essentially natural candy. Free-fed, they push birds toward obesity and crowd out better foods. Whole dates also contain a pit that must be removed.
How to serve it
Pit and chop into tiny pieces.
A small piece occasionally — think reward, not ration.