From 14a996229664fc668202eedd50cbef62634e9835 Mon Sep 17 00:00:00 2001
From: Karan Sharma <karansharma1295@gmail.com>
Date: Tue, 5 Jan 2016 19:06:28 +0530
Subject: [PATCH] handle case of negative values of seconds

---
 examples/timerbot.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/examples/timerbot.py b/examples/timerbot.py
index c900a273f..8d28ae592 100644
--- a/examples/timerbot.py
+++ b/examples/timerbot.py
@@ -43,7 +43,8 @@ def set(bot, update, args):
     try:
         # args[0] should contain the time for the timer in seconds
         due = int(args[0])
-
+        if due < 0:
+                bot.sendMessage(chat_id,text='Sorry we can not go back to future!')
         def alarm(bot):
             """ Inner function to send the alarm message """
             bot.sendMessage(chat_id, text='Beep!')