diff --git a/day01.py b/day01.py
index da7de60..7bd619d 100644
--- a/day01.py
+++ b/day01.py
@@ -34,5 +34,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(1)
+    day = Day(2021, 1)
     day.run(verbose=True)
diff --git a/day02.py b/day02.py
index f1ce5b6..a96785d 100644
--- a/day02.py
+++ b/day02.py
@@ -42,5 +42,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(2)
+    day = Day(2021, 2)
     day.run(verbose=True)
diff --git a/day03.py b/day03.py
index e693fb0..c9df4ab 100644
--- a/day03.py
+++ b/day03.py
@@ -49,5 +49,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(3)
+    day = Day(2021, 3)
     day.run(verbose=True)
diff --git a/day04.py b/day04.py
index a21bca0..e74894e 100644
--- a/day04.py
+++ b/day04.py
@@ -86,5 +86,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(4)
+    day = Day(2021, 4)
     day.run(verbose=True)
diff --git a/day05.py b/day05.py
index fd5b1b4..adc9211 100644
--- a/day05.py
+++ b/day05.py
@@ -48,5 +48,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(5)
+    day = Day(2021, 5)
     day.run(verbose=True)
diff --git a/day06.py b/day06.py
index 8041aa2..767b0ef 100644
--- a/day06.py
+++ b/day06.py
@@ -40,5 +40,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(6)
+    day = Day(2021, 6)
     day.run(verbose=True)
diff --git a/day07.py b/day07.py
index 3edd270..a2bc0f2 100644
--- a/day07.py
+++ b/day07.py
@@ -49,5 +49,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(7)
+    day = Day(2021, 7)
     day.run(verbose=True)
diff --git a/day08.py b/day08.py
index 9e10bdc..6db4014 100644
--- a/day08.py
+++ b/day08.py
@@ -69,5 +69,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(8)
+    day = Day(2021, 8)
     day.run(verbose=True)
diff --git a/day09.py b/day09.py
index a423a1e..00747fa 100644
--- a/day09.py
+++ b/day09.py
@@ -59,5 +59,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(9)
+    day = Day(2021, 9)
     day.run(verbose=True)
diff --git a/day10.py b/day10.py
index fd7b7f1..fbbca66 100644
--- a/day10.py
+++ b/day10.py
@@ -61,5 +61,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(10)
+    day = Day(2021, 10)
     day.run(verbose=True)
diff --git a/day11.py b/day11.py
index 8fb38ee..b895b91 100644
--- a/day11.py
+++ b/day11.py
@@ -59,5 +59,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(11)
+    day = Day(2021, 11)
     day.run(verbose=True)
diff --git a/day12.py b/day12.py
index 59f0d85..b1766c0 100644
--- a/day12.py
+++ b/day12.py
@@ -61,5 +61,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(12)
+    day = Day(2021, 12)
     day.run(verbose=True)
diff --git a/day13.py b/day13.py
index 0bbc626..fd3cbdc 100644
--- a/day13.py
+++ b/day13.py
@@ -64,5 +64,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(13)
+    day = Day(2021, 13)
     day.run(verbose=True)
diff --git a/day14.py b/day14.py
index 1f1b87d..a1a5cae 100644
--- a/day14.py
+++ b/day14.py
@@ -54,5 +54,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(14)
+    day = Day(2021, 14)
     day.run(verbose=True)
diff --git a/day15.py b/day15.py
index c35f609..0a024bc 100644
--- a/day15.py
+++ b/day15.py
@@ -48,5 +48,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(15)
+    day = Day(2021, 15)
     day.run(verbose=True)
diff --git a/day16.py b/day16.py
index 6bdc430..523b518 100644
--- a/day16.py
+++ b/day16.py
@@ -95,5 +95,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(16)
+    day = Day(2021, 16)
     day.run(verbose=True)
diff --git a/day17.py b/day17.py
index 2ebc52a..c8a212c 100644
--- a/day17.py
+++ b/day17.py
@@ -55,5 +55,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(17)
+    day = Day(2021, 17)
     day.run(verbose=True)
diff --git a/day18.py b/day18.py
index 521f5b5..78ec400 100644
--- a/day18.py
+++ b/day18.py
@@ -241,5 +241,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(18)
+    day = Day(2021, 18)
     day.run(verbose=True)
diff --git a/day19.py b/day19.py
index 48194fc..90b197d 100644
--- a/day19.py
+++ b/day19.py
@@ -95,5 +95,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(19)
+    day = Day(2021, 19)
     day.run(verbose=True)
diff --git a/day20.py b/day20.py
index 84bd41a..d1b6e4b 100644
--- a/day20.py
+++ b/day20.py
@@ -61,5 +61,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(20)
+    day = Day(2021, 20)
     day.run(verbose=True)
diff --git a/day21.py b/day21.py
index 8943e3c..20db8c6 100644
--- a/day21.py
+++ b/day21.py
@@ -64,5 +64,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(21)
+    day = Day(2021, 21)
     day.run(verbose=True)
diff --git a/day22.py b/day22.py
index 9173dda..bb8828d 100644
--- a/day22.py
+++ b/day22.py
@@ -113,5 +113,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(22)
+    day = Day(2021, 22)
     day.run(verbose=True)
diff --git a/day23.py b/day23.py
index df243cc..dc4699c 100644
--- a/day23.py
+++ b/day23.py
@@ -127,5 +127,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(23)
+    day = Day(2021, 23)
     day.run(verbose=True)
diff --git a/day24.py b/day24.py
index 13a9f46..c67b80d 100644
--- a/day24.py
+++ b/day24.py
@@ -78,5 +78,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(24)
+    day = Day(2021, 24)
     day.run(verbose=True)
diff --git a/day25.py b/day25.py
index d5bf0bd..e9a5b95 100644
--- a/day25.py
+++ b/day25.py
@@ -65,5 +65,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(25)
+    day = Day(2021, 25)
     day.run(verbose=True)
diff --git a/main.py b/main.py
index bf52838..c598879 100755
--- a/main.py
+++ b/main.py
@@ -5,6 +5,7 @@ import argparse
 import importlib
 import os
 
+YEAR = 2021
 TIMEIT_NUMBER = 50
 
 argument_parser = argparse.ArgumentParser()
@@ -36,5 +37,5 @@ for _, _, files in os.walk(tools.aoc.BASE_PATH):
 
 for lib in sorted(imported):
     day = int(lib[-2:])
-    day_class = getattr(globals()[lib], "Day")(day)
+    day_class = getattr(globals()[lib], "Day")(YEAR, day)
     day_class.run(flags.part if flags.part else 3, flags.verbose, flags.timeit, flags.timeit_number)
diff --git a/skel_day.py b/skel_day.py
index 9e1c653..dcebd15 100644
--- a/skel_day.py
+++ b/skel_day.py
@@ -20,5 +20,5 @@ class Day(AOCDay):
 
 
 if __name__ == '__main__':
-    day = Day(%DAY%)
+    day = Day(%YEAR%, %DAY%)
     day.run(verbose=True)
diff --git a/start_day.py b/start_day.py
new file mode 100755
index 0000000..ad80908
--- /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 = 2021
+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])