diff --git a/scripts/aday b/scripts/aday
index 3d9780996..f4479b460 100755
--- a/scripts/aday
+++ b/scripts/aday
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 import datetime
 import sys
 
@@ -8,7 +8,7 @@ def build_to_date(build):
     day = int(build[3:5])
 
     month = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.index(letter) * 3
-    year = 2009 + (month / 12)
+    year = 2009 + (month // 12)
     month %= 12
 
     return datetime.date(year, month + 1, 1) + datetime.timedelta(days=day - 1)
@@ -18,4 +18,4 @@ if __name__ == '__main__':
     if len(sys.argv) != 2:
         sys.exit('usage: aday BUILD_NUMBER')
 
-    print build_to_date(sys.argv[1])
+    print(build_to_date(sys.argv[1]))