An addition to the prefix and postfix form helpers in Foundation 5. Doesn't get much easier than that...
<div class="row">
<div class="large-5 columns">
<div class="row collapse">
<label>Date Range</label>
<div class="small-5 columns">
<input type="text" placeholder="Start Date" />
</div>
<div class="small-2 columns">
<span class="midfix">to</span>
</div>
<div class="small-5 columns">
<input type="text" placeholder="End Date" />
</div>
</div>
</div>
</div>