Save different game object's datas using the same script?

Hi everybody, I've a little problem. I'm making a simple application in witch user do maintenance to electrical system of a building. I created a script that allows you to inser the current date in whcich you are doing maintenance and automatically appear the maintenance deadline. It works great, but if add the same script to 2 different game object my code don't save either datas. How can I solve this problem? thank you a lot.

Here there is the script:

using UnityEngine; using UnityEngine.UI; using System.Collections; using System; public class Clock : MonoBehaviour { #region Declarations public static float unscaledTime; //refer to this value when determining timed-event checks (measures playtime in seconds since the start of the game). public static float time; //refer to this value "Time.timeElapsed" when determining in-game timed-event checks such as weather (measures time in seconds since the start of the game inclusive of timescale effects) [SerializeField] private Text clockText;

 [SerializeField]
 private Text dateText;
 [SerializeField]
 private float clockSpeed = 1f;
 DateTime currentTime;
 DateTime deadlineTime;
 
 DateTime maintenanceTime;
 public int howMuchTime;

 #endregion

 public Text dateMaintenance;
 public Text maintenanceDeadline;
 private int dateConverter;
 private int dateConverterDAY;
 private int dateConverterMONTH;
 private int dateConverterYEAR;
 private int currentdate;
 private int currentdateDAY;
 private int currentdateMONTH;
 private int currentdateYEAR;


 public GameObject exclamationPoint; 
 

 void Start() {
     currentTime = System.DateTime.Now;

     #region date converter
     currentdateDAY= int.Parse(currentTime.ToString("dd"));
     currentdateMONTH = int.Parse(currentTime.ToString("MM"));
     currentdateYEAR = int.Parse(currentTime.ToString("yyyy"));
     currentdate = currentdateDAY + (currentdateMONTH * 30) + (currentdateYEAR * 365);
     Debug.Log(currentdate);
     #endregion

     exclamationPoint.SetActive(false);
    dateMaintenance.text = PlayerPrefs.GetString("dateMaintenance", currentTime.ToString("dd/MM/yyyy")).ToString();
     maintenanceDeadline.text = PlayerPrefs.GetString("maintenanceDeadline", deadlineTime.ToString("dd/MM/yyyy")).ToString();
     dateConverter = PlayerPrefs.GetInt("dateConverter",dateConverter);

     Debug.Log(dateConverter);
     

     if ((dateConverter - currentdate) < 7){ 
     
         Debug.Log("Meno di 7 giorni! Fare manutenzione a breve!!");
         exclamationPoint.SetActive(true);


     }
     else {

Debug.Log("più di 7 giorni! C'è ancora tempo"); exclamationPoint.SetActive(false); }

 }


 #region Clock
 void Awake()
 {
     
     Time.timeScale = 1.0f;
     InvokeRepeating("Lapse", 0, clockSpeed * Time.timeScale);
 }
 void Lapse()
 {
     currentTime = System.DateTime.Now;
     
     clockText.text = currentTime.ToString("hh:mm:ss");
     dateText.text = currentTime.ToString("dd/MM/yyyy"); //Specifies the name of the day, its date, the name of the month, and the year);


 }
 public void NormalSpeed()
 {
     Time.timeScale = 1.0f;
 }
 void MinuteSpeed()
 {
     Time.timeScale = 60.0f;
 }
 void HourSpeed()
 {
     Time.timeScale = 600.0f;
 }

 public void maintenanceCommand() {

     dateMaintenance.text = currentTime.ToString("dd/MM/yyyy");
     deadlineTime = currentTime.AddYears(howMuchTime);

     #region date converter
     dateConverterDAY =  int.Parse(deadlineTime.ToString("dd"));
     dateConverterMONTH = int.Parse(deadlineTime.ToString("MM"));
     dateConverterYEAR = int.Parse(deadlineTime.ToString("yyyy"));
     dateConverter = dateConverterDAY + (dateConverterMONTH * 30) + (dateConverterYEAR * 365);
     Debug.Log(dateConverter);
     #endregion

     Debug.Log(currentTime);
     maintenanceDeadline.text = deadlineTime.ToString("dd/MM/yyyy");

     PlayerPrefs.SetString("dateMaintenance", currentTime.ToString("dd/MM/yyyy"));
     PlayerPrefs.SetString("maintenanceDeadline", deadlineTime.ToString("dd/MM/yyyy"));
     PlayerPrefs.SetInt("dateConverter", dateConverter);
    
     exclamationPoint.SetActive(false);
     Debug.Log("Manutenzione avvenuta!!");

 }

 public void Reset() {
     PlayerPrefs.DeleteAll();
     dateMaintenance.text = "00/00/0000";
     maintenanceDeadline.text = "00/00/0000";
 }


 #endregion

}