Add date filter to recordset

Question

Is it possible to add some filters to a paged dataset?
One of the columns is date, its in unix format, and isn't displayed, the pretty date is in a visible column. I want to have 3 check boxes:
1. Expires within 3 months
2. Expires within 2 months
3. Expires within 1 month
I have been reading this: http://labs.adobe.com/technologies/spry/samples/data_region/MultipleFiltersSample.html
And realise that I need to write something like this:
function ff1(ds, row, index){ var c = row.name.charAt(0); return c >= 'A' && c <= 'H' ? null : row; };
But due to knowing very little about JavaScript I am not sure how to do the date comparison.
Can Javascript handle unix dates?
Each filter will be something like this:
show records where daterow is between today and today minus 3 months
show records where daterow is between today and today minus 2 months
show records where daterow is between today and today minus 1 month
Can anyone help?
Cheers,
Steve

Answer 1

Hmph, I may have to abandon this filter, the performance is dire. It takes over 3 seconds to filter a list of 22 records, thats with none matching the filter. If I use a list with 230 rows it crashes the browser.
I do have a keyword filter on this list as well, you type in part of a keyword and it filters it straigh away, even the 230 long list. Why mine is killing the performance I really don't know.
This is my current filter:
function filterExpire90(){
     var today = Date.today(), expire = Date.today().add(-90).days();
     function filterDate90(ds, row, index){
          var c = Date.parse(row["lastdate"]).add(1).years();
          return c.between(expire, today) ? row : null;
      // filter
     dsHoists.filter(filterDate90);
And this is the faster filter from the Labs example:
function FilterData()
    var tf = document.getElementById("filterTF");
    if (!tf.value)
        // If the text field is empty, remove any filter
        // that is set on the data set.
        dsHoists.filter(null);
        return;
    // Set a filter on the data set that matches any row
    // that begins with the string in the text field.
    var regExpStr = tf.value;
    //if (!document.getElementById("containsCB").checked)
        //regExpStr = "^" + regExpStr;
    var regExp = new RegExp(regExpStr, "i");
    var filterFunc = function(ds, row, rowNumber)
        var str = row["serial"];
        if (str && str.search(regExp) != -1)
            return row;
        return null;
    dsHoists.filter(filterFunc);
function StartFilterTimer()
    if (StartFilterTimer.timerID)
        clearTimeout(StartFilterTimer.timerID);
    StartFilterTimer.timerID = setTimeout(function() { StartFilterTimer.timerID = null; FilterData(); }, 100);
Steve