diff --git a/setup.py b/setup.py
index c8d59a3..040e9f2 100644
--- a/setup.py
+++ b/setup.py
@@ -1,14 +1,14 @@
-from setuptools import setup, find_packages
+from setuptools import setup
 
 setup(
     name="timer",
-    version="0.1",
+    version="0.2",
     author="Alexander Nigl",
     py_modules=["timer"],
     install_requires=[
-    "click",
+        "click",
     ],
-    entry_points = {
-        'console_scripts': ['timer=timer:main'],
-    }
+    entry_points={
+        "console_scripts": ["timer=timer:main"],
+    },
 )
diff --git a/timer.py b/timer.py
index 50717a8..57f26c3 100755
--- a/timer.py
+++ b/timer.py
@@ -4,30 +4,47 @@ from tkinter import Tk, CENTER, Label
 import click
 import typing as t
 
+DELTASECONDS = "+%Ss"
+DELTAMINUTES = "+%Mm"
+DELTAHOURS = "+%Hh"
+HOURS = "%H:%M"
+DATETIME_FORMAT = [
+    "%Y-%m-%d",
+    "%Y-%m-%dT%H:%M:%S",
+    "%Y-%m-%d %H:%M:%S",
+    "%Y-%m-%d %H:%M",
+    HOURS,
+    DELTAHOURS,
+    DELTAMINUTES,
+    DELTASECONDS,
+]
+
 
 class DateTime(click.DateTime):
     def _try_to_convert_date(self, value: t.Any, format: str) -> t.Optional[datetime]:
         try:
-            if format == SECONDS and value[-1] == "s":
-                return datetime.datetime.now() + datetime.timedelta(seconds=int(value[1:-1]))
-            if format == MINUTES and value[-1] == "m":
-                return datetime.datetime.now() + datetime.timedelta(minutes=int(value[1:-1]))
+            if format == DELTASECONDS and value[-1] == "s":
+                return datetime.datetime.now() + datetime.timedelta(
+                    seconds=int(value[1:-1])
+                )
+            if format == DELTAMINUTES and value[-1] == "m":
+                return datetime.datetime.now() + datetime.timedelta(
+                    minutes=int(value[1:-1])
+                )
+            if format == DELTAHOURS and value[-1] == "h":
+                return datetime.datetime.now() + datetime.timedelta(
+                    hours=int(value[1:-1])
+                )
             if format == HOURS:
                 return datetime.datetime.combine(
                     datetime.datetime.now().date(),
-                    datetime.datetime.strptime(value, format).time()
+                    datetime.datetime.strptime(value, format).time(),
                 )
             return datetime.datetime.strptime(value, format)
         except ValueError:
             return None
 
 
-SECONDS = '+%Ms'
-MINUTES = '+%Mm'
-HOURS = '%H:%M'
-DATETIME_FORMAT = ['%Y-%m-%d', '%Y-%m-%dT%H:%M:%S', '%Y-%m-%d %H:%M:%S', '%Y-%m-%d %H:%M', HOURS, MINUTES, SECONDS]
-
-
 @click.command()
 @click.argument("enddate", type=DateTime(formats=DATETIME_FORMAT))
 def main(enddate):
@@ -36,7 +53,7 @@ def main(enddate):
     root.configure(background="#000")
     tlbl = Label(root, text="", font=("Arial", -100), fg="#fff", bg="#000")
     tlbl.pack()
-    tlbl.place(relx=.5, rely=.5, anchor=CENTER)
+    tlbl.place(relx=0.5, rely=0.5, anchor=CENTER)
 
     def deltaStr(t):
         days, remainder = divmod(t.total_seconds(), 60 * 60 * 24)
@@ -52,7 +69,7 @@ def main(enddate):
 
     def resize(_):
         ratio = root.winfo_width() / 1920
-        tlbl.configure(font=('Chicago', int(ratio * -200)))
+        tlbl.configure(font=("Chicago", int(ratio * -200)))
 
     def update():
         delta = enddate - datetime.datetime.now()
@@ -66,7 +83,7 @@ def main(enddate):
     root.bind("<Configure>", resize)
     root.bind("<Escape>", lambda x: root.destroy())
     root.after(1, update)
-    root.wm_attributes('-type', 'splash')
+    root.wm_attributes("-type", "splash")
     root.mainloop()