doubt regarding Conversion of date into timestamp

[praba kar]

Dear All,

     I am new to Python I want to know how to 
change a time into timestamp
 
eg "Fri, 8 Apr 2005 09:22:14 +0900" like format
date I want to change as a timestamp.

I have used below code to get timestamp
import time
time.strptime(v,'%a, %d %b %Y %X +0900')

function.  This function will return time stamp.  But
If the format of date string is changed.  This
function raise error 

eg My web application always return different format
of date

Fri, 8 Apr 2005 10:31:37 +0530
Fri, 8 Apr 2005 10:11:03 +0900
Fri, 8 Apr 2005 09:40:47 +0800

Kindly help to resolve this problem. 

with regards,
Prabahar 

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