Custom Search Form with category and year filter

Hi,

I have created a custom category template in which I have placed a custom forum to search results in that category only. I want to add year filter to it so that results are filtered by year.

This is what I have as of now.

<form role="search" method="get" id="searchform" action="https://localhost/demo/category/news/">
	<input type="text" name="s" id="s" value=" " onfocus="if(this.value==this.defaultValue)this.value='';" onblur="if(this.value=='')this.value=this.defaultValue;"/><br />
	<select name="post_type">
		<option value="">Choose Category:</option>
		<option value="5">All Categories</option>
		<option value="1">News</option>
		<option value="2">Archived</option>
		 <option value="3">Popular</option>
	</select><br />
	<input type="submit" id="searchsubmit" value="Search Help" />
</form>

I need to add year filter to this