Getting transactions and time from Block Chain Info Api I want to fetch transactions for an address from the following api:

https://blockchain.info/address/$btc_address?format=json


The thing is understanding the json returned from the api, I don't understand which of them are the transaction and the time when that transaction took place.

Can any one help?
You could use an online JSON viewer like http://jsonviewer.stack.hu (there are many others).

Just paste the return JSON into their text box and click the "viewer" tab. you will then see the JSON data in a formated expandable tree view, making it much easier to identify the transaction ids, times, and blockheights.

The transactions start under the [txs] tab in the tree.