diff --git a/src/cst_python/core/entities/memory.py b/src/cst_python/core/entities/memory.py
index 30e0160..bbaa0a6 100644
--- a/src/cst_python/core/entities/memory.py
+++ b/src/cst_python/core/entities/memory.py
@@ -38,7 +38,7 @@ def set_evaluation(self, evaluation:float) -> None:
 
     #@alias.alias("getTimestamp")
     @abc.abstractmethod
-    def get_timestamp(self) -> float:
+    def get_timestamp(self) -> int:
         ...
 
     #@alias.alias("addMemoryObserver")
@@ -53,17 +53,17 @@ def remove_memory_observer(self, observer:MemoryObserver) -> None:
 
     #@alias.alias("getId")
     @abc.abstractmethod
-    def get_id(self) -> float:
+    def get_id(self) -> int:
         ...
 
     #@alias.alias("setId")
     @abc.abstractmethod
-    def set_id(self, memory_id:float) -> None:
+    def set_id(self, memory_id:int) -> None:
         ...
 
     #@alias.alias("getTimestamp")
     @abc.abstractmethod
-    def get_timestamp(self) -> float:
+    def get_timestamp(self) -> int:
         ...
     
 
diff --git a/src/cst_python/core/entities/memory_object.py b/src/cst_python/core/entities/memory_object.py
index 9ab855d..48a8160 100644
--- a/src/cst_python/core/entities/memory_object.py
+++ b/src/cst_python/core/entities/memory_object.py
@@ -10,8 +10,8 @@
 class MemoryObject(Memory):
 
     def __init__(self) -> None:
-        self._id = 0.0
-        self._timestamp = 0.0
+        self._id = 0
+        self._timestamp = 0
         self._evaluation = 0.0
         self._info : Any = None
         self._name = ""
@@ -24,10 +24,10 @@ def __getstate__(self) -> object:
 
         return state
     
-    def get_id(self) -> float:
+    def get_id(self) -> int:
         return self._id
     
-    def set_id(self, memory_id: float) -> None:
+    def set_id(self, memory_id: int) -> None:
         self._id = memory_id
 
     def get_info(self) -> Any:
@@ -35,7 +35,7 @@ def get_info(self) -> Any:
     
     def set_info(self, value: Any) -> int:
         self._info = value
-        self._timestamp = time.time()
+        self._timestamp = int(time.time()*1000)
         self._notify_memory_observers()
 
         return -1
@@ -47,16 +47,16 @@ def _notify_memory_observers(self) -> None:
     def update_info(self, info:Any) -> None:
         self.set_info(info)
 
-    def get_timestamp(self) -> float:
+    def get_timestamp(self) -> int:
         return self._timestamp
 
     @property
-    def timestamp(self) -> float:
+    def timestamp(self) -> int:
         return self._timestamp
 
     #@alias.alias("setTimestamp")
     @timestamp.setter
-    def timestamp(self, value:float) -> None:
+    def timestamp(self, value:int) -> None:
         self._timestamp = value
 
     def get_name(self) -> str:
@@ -72,7 +72,7 @@ def get_evaluation(self) -> float:
         return self._evaluation
 
     def set_evaluation(self, evaluation: float) -> None:
-        return self._evaluation
+        self._evaluation = evaluation
 
     #@alias.alias("toString", "to_string")
     def __str__(self) -> str: