How to show date?

Why my code don’t show the date, only UnityEngine.Debug:Log(Object)?

PlayerPrefs.SetString("date time" System.DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss"));
Debug.Log(PlayerPrefs.GetString("date time"));

Works perfectly for me. added “,” after the “date time”

PlayerPrefs.SetString("date time", System.DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss"));
Debug.Log(PlayerPrefs.GetString("date time"));