diff --git a/bin/canon-zip b/bin/canon-zip
new file mode 100755
index 0000000..c4d329f
--- /dev/null
+++ b/bin/canon-zip
@@ -0,0 +1,22 @@
+#!/usr/bin/python
+
+from zipfile import ZipFile
+import sys
+
+"""Canonicalize a zip/jar file.  Sets all the filestamps to a specific date.
+
+    canon-zip YYYY-MM-DD INPUT OUTPUT
+"""
+
+(year, month, day) = sys.argv[1].split('-')
+year = int(year)
+month = int(month)
+day = int(day)
+
+with ZipFile(sys.argv[3], 'w') as outzip:
+    with ZipFile(sys.argv[2], 'r') as inzip:
+        for info in inzip.infolist():
+            info.date_time = (year, month, day, 0, 0, 0)
+            content = inzip.read(info.filename)
+            outzip.writestr(info, content)
+