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@sudhamani.srikantachari
I assume what you're asking for is the timestamp of the last trade for an exchange traded instrument, right? There are several fields where you can find it and the availability of the fields depends on the exchange. The most commonly used field is probably SALTIM_MS, which provides the timestamp of the last trade in millisecond granularity.
If you need further help, the best resource to direct content search and explanation questions to is Thomson Reuters Helpdesk, which you can reach by either calling the Helpdesk number in your country or using Contact Us capability in Eikon application, or following the link below:
http://my.thomsonreuters.com/ContactUsNew