Here's one example, using reported speech: "I will cook dinner after work," he said. He said that he would cook dinner after work. So in this example you are talking about the past, where a prediction (using will) was made. "Will" shifts to "would". "Would" is far more flexible than that, so even though "future is the past" is arguably a correct phrase, it's also very misleading,

As far as i understand your question ~ we use "WILL" for future tense ~ but we use "WOULD" to tell future in the past ~

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It may help you, have a look http://www.engvid.com/english-grammar-the-future-in-the-past/