I found this site while i was browsing through. This might be useful. though the data is for 2009-10 the time frames might be similar for 2010-11 also.
Due Dates for 2009-10 Taxes & Statutory Compliances, India <link updated to site home> ( Search On Cite | Search On Google )
ps: i am just forwarding data i found on the net, so please re-confirm and then proceed accordingly.
From India, Bangalore
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