diff --git a/day16.py b/day16.py
new file mode 100644
index 0000000..fff8003
--- /dev/null
+++ b/day16.py
@@ -0,0 +1,60 @@
+from tools.aoc import AOCDay
+from typing import Any
+
+
+class Day(AOCDay):
+    inputs = [
+        [
+            (24176176, "test_input16"),
+            (73745418, "test_input16_2"),
+            (52432133, "test_input16_3"),
+            (59522422, "input16"),
+        ],
+        [
+            (84462026, "test_input16_4"),
+            (None, "input16"),
+        ]
+    ]
+
+    def part1(self) -> Any:
+        base_pattern = [0, 1, 0, -1]
+        the_number = self.getInput()
+
+        for r in range(100):
+            new_number = 0
+            for l in range(len(the_number)):
+                mul_sum = 0
+                for i, c in enumerate(the_number):
+                    pattern_index = ((i + 1) // (l + 1)) % 4
+                    mul_sum += ((ord(c) - 48) * (2 - pattern_index if pattern_index else 0))
+
+                new_number = new_number * 10 + abs(mul_sum) % 10
+
+            the_number = "0" * (len(the_number) - len(str(new_number))) + str(new_number)
+
+        return int(the_number[:8])
+
+    def part2(self) -> Any:
+        base_pattern = [0, 1, 0, -1]
+        the_number = 10000 * self.getInput()
+
+        for r in range(100):
+            print("Round", r)
+            new_number = 0
+            for l in range(len(the_number)):
+                mul_sum = 0
+                for i, c in enumerate(the_number):
+                    pattern_index = ((i + 1) // (l + 1)) % 4
+                    mul_sum += ((ord(c) - 48) * (2 - pattern_index if pattern_index else 0))
+
+                new_number = new_number * 10 + abs(mul_sum) % 10
+
+            the_number = "0" * (len(the_number) - len(str(new_number))) + str(new_number)
+
+        offset = int(the_number[:8])
+        return int(the_number[offset + 1:offset + 8])
+
+
+if __name__ == '__main__':
+    day = Day(2019, 16)
+    day.run(verbose=True)
diff --git a/inputs/test_input16 b/inputs/test_input16
new file mode 100644
index 0000000..a0d6069
--- /dev/null
+++ b/inputs/test_input16
@@ -0,0 +1 @@
+80871224585914546619083218645595
diff --git a/inputs/test_input16_2 b/inputs/test_input16_2
new file mode 100644
index 0000000..e62b53a
--- /dev/null
+++ b/inputs/test_input16_2
@@ -0,0 +1 @@
+19617804207202209144916044189917
diff --git a/inputs/test_input16_3 b/inputs/test_input16_3
new file mode 100644
index 0000000..fc400a2
--- /dev/null
+++ b/inputs/test_input16_3
@@ -0,0 +1 @@
+69317163492948606335995924319873
diff --git a/inputs/test_input16_4 b/inputs/test_input16_4
new file mode 100644
index 0000000..7e44d27
--- /dev/null
+++ b/inputs/test_input16_4
@@ -0,0 +1 @@
+03036732577212944063491565474664
diff --git a/skel_day.py b/skel_day.py
index 2744f2a..bf3331b 100644
--- a/skel_day.py
+++ b/skel_day.py
@@ -3,11 +3,22 @@ from typing import Any
 
 
 class Day(AOCDay):
-    test_solutions_p1 = []
-    test_solutions_p2 = []
+    inputs = [
+        [
+            (None, "input%DAY%"),
+        ],
+        [
+            (None, "input%DAY%"),
+        ]
+    ]
 
     def part1(self) -> Any:
         return ""
 
     def part2(self) -> Any:
         return ""
+
+
+if __name__ == '__main__':
+    day = Day(%YEAR%, %DAY%)
+    day.run(verbose=True)
diff --git a/start_day.py b/start_day.py
new file mode 100755
index 0000000..5faa1f1
--- /dev/null
+++ b/start_day.py
@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+from argparse import ArgumentParser
+from datetime import datetime
+from os.path import exists
+from platform import system
+from subprocess import call
+from time import sleep
+import webbrowser
+
+
+YEAR = 2019
+CHARMS = {
+    'Linux': '/usr/local/bin/charm',
+    'Windows': r'C:\somewhere\pycharm64.exe'
+}
+
+arg_parser = ArgumentParser()
+arg_parser.add_argument("-d", "--day", help="start a specific day (default: today)", type=int)
+args = arg_parser.parse_args()
+
+DAY = args.day or datetime.now().day
+
+if YEAR < 2015 or not 1 <= DAY <= 25:
+    print("Invalid year or day for year: %d, day: %d" % (YEAR, DAY))
+    exit()
+
+day_file = "day%02d.py" % DAY
+if exists(day_file):
+    print(day_file, "already exists. Use that one!")
+    exit()
+
+with open("skel_day.py", "r") as IN:
+    with open(day_file, "w") as OUT:
+        while in_line := IN.readline():
+            OUT.write(in_line.replace("%YEAR%", str(YEAR)).replace("%DAY%", str(DAY)))
+
+start = datetime(YEAR, 12, DAY, 6, 0, 0)
+now = datetime.now()
+if start > now:
+    time_wait = start - now
+    if time_wait.days > 0:
+        print("Do you really want to wait %d days?" % time_wait.days)
+        exit()
+
+    for x in range(time_wait.seconds, -1, -1):
+        print("Day starts in %02ds.\r")
+        sleep(1)
+
+call([CHARMS[system()], day_file])
+webbrowser.open("https://adventofcode.com/%d/day/%d" % (YEAR, DAY))
+call(["git", "add", day_file])