>>It depends on the "Web Page" structure, on the method they use to display information, on the method you use to access information from "Web Page", etc. What is the "Web PAge" you are talking about?
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>>>How di i extract timestamp from a header in a Web page so that i can match it and know if the page is refreshed or not ?
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>http://www.nseindia.com/marketinfo/companyinfo/eod/announcements.jsp?symbol=ACC

I cannot see in the document there any timestamp, only dates in "Announcement Date" column. What do you mean, "header in a Web page"? Where is the header there?
Or from this page you go to other sub pages/options?