diff --git a/bin/read_timestamp b/bin/read_timestamp
index 54b178e..d9b7320 100755
--- a/bin/read_timestamp
+++ b/bin/read_timestamp
@@ -1,5 +1,4 @@
-#!/usr/bin/env python
-import sys
-from email.Utils import formatdate
+#!/bin/bash
+set -euo pipefail
 
-print formatdate(float(sys.argv[1]))
+exec date -d @$1