diff --git a/python/datetime.py b/python/datetime.py
index ea19dd73..3e94ecd7 100644
--- a/python/datetime.py
+++ b/python/datetime.py
@@ -1,5 +1,6 @@
-from time import localtime, time as current_time
-from datetime import datetime as dt, timedelta as td #internally using datetime , timedelta for __add__,__sub__
+
+from time import localtime
+
 
 class timedelta:
     def __init__(self, days=0, seconds=0):
@@ -9,30 +10,41 @@ class timedelta:
     def __repr__(self):
         return f"datetime.timedelta({self.days}, {self.seconds})"
 
+    def check(self, other, class_type):
+        if not isinstance(other, class_type):
+            raise NotImplementedError("incompatible types / not implemented")
+
     def __eq__(self, other: 'timedelta') -> bool:
+        self.check(other, timedelta)
         return (self.days, self.seconds) == (other.days, other.seconds)
 
     def __lt__(self, other: 'timedelta') -> bool:
+        self.check(other, timedelta)
         return (self.days, self.seconds) < (other.days, other.seconds)
 
     def __le__(self, other: 'timedelta') -> bool:
+        self.check(other, timedelta)
         return (self.days, self.seconds) <= (other.days, other.seconds)
 
     def __gt__(self, other: 'timedelta') -> bool:
+        self.check(other, timedelta)
         return (self.days, self.seconds) > (other.days, other.seconds)
 
     def __ge__(self, other: 'timedelta') -> bool:
+        self.check(other, timedelta)
         return (self.days, self.seconds) >= (other.days, other.seconds)
 
+
 class timezone:
     def __init__(self, delta: timedelta):
-        self._delta = delta
+        self.delta = delta
 
     def __repr__(self):
-        return f"datetime.timezone({self._delta})"
+        return f"datetime.timezone({self.delta})"
+
 
 class date:
-    def __init__(self, year: int, month: int=None, day: int=None):
+    def __init__(self, year: int, month: int = None, day: int = None):
         self.year = year
         self.month = month
         self.day = day
@@ -41,36 +53,38 @@ class date:
     def today():
         t = localtime()
         return date(t.tm_year, t.tm_mon, t.tm_mday)
-    
+
+    def check(self, other, class_type):
+        if not isinstance(other, class_type):
+            raise NotImplementedError("incompatible types / not implemented")
+
     def __eq__(self, other: 'date') -> bool:
-        return self.year == other.year and self.month == other.month and self.day == other.day
-    
+        self.check(other, date)
+        return (self.year, self.month, self.day) == (other.year, other.month, other.day)
+
     def __lt__(self, other: 'date') -> bool:
+        self.check(other, date)
         return (self.year, self.month, self.day) < (other.year, other.month, other.day)
-    
+
     def __le__(self, other: 'date') -> bool:
+        self.check(other, date)
         return (self.year, self.month, self.day) <= (other.year, other.month, other.day)
-    
+
     def __gt__(self, other: 'date') -> bool:
+        self.check(other, date)
         return (self.year, self.month, self.day) > (other.year, other.month, other.day)
 
     def __ge__(self, other: 'date') -> bool:
+        self.check(other, date)
         return (self.year, self.month, self.day) >= (other.year, other.month, other.day)
-    
-    def __add__(self, other: 'timedelta') -> 'date':
-        new_date=dt(self.year,self.month,self.day)+td(other.days,other.seconds)
-        return date(new_date.year,new_date.month,new_date.day)
-
-    def __sub__(self, other: 'timedelta') -> 'date':
-        new_date=dt(self.year,self.month,self.day)-td(other.days,other.seconds)
-        return date(new_date.year,new_date.month,new_date.day)
 
     def __str__(self):
         return f"{self.year}-{self.month:02}-{self.day:02}"
-    
+
     def __repr__(self):
         return f"datetime.date({self.year}, {self.month}, {self.day})"
 
+
 class datetime(date):
     def __init__(self, year: int, month: int = None, day: int = None, hour: int = None, minute: int = None, second: int = None, tzinfo: timezone = None):
         super().__init__(year, month, day)
@@ -91,43 +105,45 @@ class datetime(date):
         t = localtime()
         return datetime(t.tm_year, t.tm_mon, t.tm_mday, t.tm_hour, t.tm_min, t.tm_sec)
 
+    def check(self, other, class_type):
+        if not isinstance(other, class_type):
+            raise NotImplementedError("incompatible types / not implemented")
+
     def __str__(self):
         return f"{self.year}-{self.month:02}-{self.day:02} {self.hour:02}:{self.minute:02}:{self.second:02}"
 
     def __repr__(self):
         return f"datetime.datetime({self.year}, {self.month}, {self.day}, {self.hour}, {self.minute}, {self.second})"
-    
+
     def __eq__(self, other) -> bool:
-        return (self.year, self.month, self.day, self.hour, self.minute, self.second) == \
-               (other.year, other.month, other.day, other.hour, other.minute, other.second)
+        self.check(other, datetime)
+        return (self.year, self.month, self.day, self.hour, self.minute, self.second) ==\
+            (other.year, other.month, other.day,
+             other.hour, other.minute, other.second)
 
     def __lt__(self, other) -> bool:
-        return (self.year, self.month, self.day, self.hour, self.minute, self.second) < \
-               (other.year, other.month, other.day, other.hour, other.minute, other.second)
+        self.check(other, datetime)
+        return (self.year, self.month, self.day, self.hour, self.minute, self.second) <\
+            (other.year, other.month, other.day,
+             other.hour, other.minute, other.second)
 
     def __le__(self, other) -> bool:
-        return (self.year, self.month, self.day, self.hour, self.minute, self.second) <= \
-               (other.year, other.month, other.day, other.hour, other.minute, other.second)
+        self.check(other, datetime)
+        return (self.year, self.month, self.day, self.hour, self.minute, self.second) <=\
+            (other.year, other.month, other.day,
+             other.hour, other.minute, other.second)
 
     def __gt__(self, other) -> bool:
-        return (self.year, self.month, self.day, self.hour, self.minute, self.second) > \
-               (other.year, other.month, other.day, other.hour, other.minute, other.second)
+        self.check(other, datetime)
+        return (self.year, self.month, self.day, self.hour, self.minute, self.second) >\
+            (other.year, other.month, other.day,
+             other.hour, other.minute, other.second)
 
     def __ge__(self, other) -> bool:
-        return (self.year, self.month, self.day, self.hour, self.minute, self.second) >= \
-               (other.year, other.month, other.day, other.hour, other.minute, other.second)
-    
-    def __add__(self, other: 'timedelta') -> 'datetime':
-        new_datetime = dt(self.year, self.month, self.day, self.hour, self.minute, self.second) + td(days=other.days, seconds=other.seconds)
-        return datetime(new_datetime.year, new_datetime.month, new_datetime.day, new_datetime.hour, new_datetime.minute, new_datetime.second)
-    
-    def __sub__(self, other: 'timedelta') -> 'datetime':
-        total_seconds = self.second + other.seconds + other.days * 86400
-        new_datetime = self - timedelta(seconds=total_seconds)
-        return new_datetime
-    
+        self.check(other, datetime)
+        return (self.year, self.month, self.day, self.hour, self.minute, self.second) >=\
+            (other.year, other.month, other.day,
+             other.hour, other.minute, other.second)
+
     def timestamp(self) -> float:
-        delta = self - datetime(1970, 1, 1)
-        return delta.total_seconds()
-
-
+        return self.now()
diff --git a/tests/80_datetime.py b/tests/80_datetime.py
new file mode 100644
index 00000000..d5c3e3f7
--- /dev/null
+++ b/tests/80_datetime.py
@@ -0,0 +1,39 @@
+import datetime
+
+
+def test_timedelta():
+    assert datetime.timedelta(days=1) == datetime.timedelta(days=1)
+    assert datetime.timedelta(days=1) != datetime.timedelta(days=2)
+    assert datetime.timedelta(days=1, seconds=1) >= datetime.timedelta(days=1)
+    assert datetime.timedelta(days=0, seconds=1) <= datetime.timedelta(days=1)
+    assert datetime.timedelta(days=1, seconds=1) < datetime.timedelta(days=2)
+    assert datetime.timedelta(days=1, seconds=1) > datetime.timedelta(days=0)
+
+
+def test_date():
+    assert datetime.date(2023, 8, 5) == datetime.date(2023, 8, 5)
+    assert datetime.date(2023, 8, 5) != datetime.date(2023, 8, 6)
+    assert datetime.date(2024, 8, 5) >= datetime.date(2023, 8, 6)
+    assert datetime.date(2023, 8, 5) <= datetime.date(2023, 8, 6)
+    assert datetime.date(2024, 8, 5) > datetime.date(2023, 8, 6)
+    assert datetime.date(2023, 8, 5) < datetime.date(2024, 8, 6)
+
+
+def test_datetime():
+    assert datetime.datetime(
+        2023, 8, 5, 12, 0, 0) == datetime.datetime(2023, 8, 5, 12, 0, 0)
+    assert datetime.datetime(
+        2023, 8, 5, 12, 0, 0) != datetime.datetime(2023, 8, 5, 12, 1, 0)
+    assert datetime.datetime(
+        2023, 8, 5, 12, 0, 0) >= datetime.datetime(2023, 8, 5, 12, 0, 0)
+    assert datetime.datetime(
+        2023, 8, 5, 12, 30, 0) > datetime.datetime(2023, 8, 5, 12, 1, 0)
+    assert datetime.datetime(
+        2023, 8, 5, 12, 0, 0) < datetime.datetime(2023, 8, 5, 12, 1, 0)
+    assert datetime.datetime(
+        2023, 8, 5, 12, 0, 0) <= datetime.datetime(2023, 8, 5, 12, 1, 0)
+
+
+test_timedelta()
+test_date()
+test_datetime()