diff --git a/Semi_ATE/TnD/TnD.py b/Semi_ATE/TnD/TnD.py
index 73463f3..2911159 100644
--- a/Semi_ATE/TnD/TnD.py
+++ b/Semi_ATE/TnD/TnD.py
@@ -81,15 +81,6 @@ def iso_to_gregorian(iso_year, iso_week, iso_day):
     return year_start + datetime.timedelta(days=iso_day - 1, weeks=iso_week - 1)
 
 
-def url_datetime_string_to_epoch(url_datetime):
-    retval = url_datetime
-    print(retval)
-    retval = retval.split(",")[1].strip()
-    retval = retval.replace("GMT", "").strip()
-    retval = datetime.datetime.strptime(retval, "%d %b %Y %H:%M:%S")
-    return int((retval - datetime.datetime(1970, 1, 1)).total_seconds())
-
-
 def micronas_time_structure_to_epoch(Datum=0, Uhrzeit=0):
     """
     Micronas uses the following legacy structures:
@@ -122,12 +113,6 @@ class DTError(RuntimeError):
     def __init__(self, arg):
         self.args = arg
 
-    def __str__(self):
-        return "".join(self.args)
-
-    def __repr__(self):
-        return "".join(self.args)
-
 
 class TD(object):
     """
diff --git a/tests/test_TD.py b/tests/test_TD.py
index bf271b9..09bb206 100644
--- a/tests/test_TD.py
+++ b/tests/test_TD.py
@@ -1,7 +1,19 @@
-#!/usr/bin/env python3
-# -*- coding: utf-8 -*-
-"""
-Created on Thu Feb 18 22:42:32 2021
+import time
+
+from Semi_ATE.TnD.TnD import DT, TD
+
+
+try:
+    _ = DT()
+    _ = _ - DT(_.epoch + 1)
+except:
+    assert False
+else:
+    assert True
+
+one = 34858861
+two = 2 * one
+
+assert TD(one).__str__() == "1 year 1 month 1 week 1 day 1 hour 1 minute 1 second"
+assert TD(two).__str__() == "2 years 2 months 2 weeks 2 days 2 hours 2 minutes 2 seconds"
 
-@author: nerohmot
-"""
diff --git a/tests/test_is_date.py b/tests/test_is_date.py
new file mode 100644
index 0000000..c9a0782
--- /dev/null
+++ b/tests/test_is_date.py
@@ -0,0 +1,5 @@
+from Semi_ATE.TnD.TnD import is_date
+
+assert is_date("32000000") is False
+assert is_date("00130000") is False
+assert is_date(0) is False
\ No newline at end of file
diff --git a/tests/test_is_datecode.py b/tests/test_is_datecode.py
new file mode 100644
index 0000000..b747488
--- /dev/null
+++ b/tests/test_is_datecode.py
@@ -0,0 +1,8 @@
+from Semi_ATE.TnD.TnD import is_datecode
+
+assert is_datecode("00540") is False
+assert is_datecode("00XX0") is False
+assert is_datecode("00010") is False
+assert is_datecode("00018") is False
+assert is_datecode("0001X") is False
+assert is_datecode(0) is False
diff --git a/tests/test_micronas_time_structure_to_epoch.py b/tests/test_micronas_time_structure_to_epoch.py
new file mode 100644
index 0000000..33f9e5b
--- /dev/null
+++ b/tests/test_micronas_time_structure_to_epoch.py
@@ -0,0 +1,3 @@
+from Semi_ATE.TnD.TnD import micronas_time_structure_to_epoch
+
+assert True
\ No newline at end of file