//http://www.frequency-decoder.com/2006/09/16/unobtrusive-table-sort-script-revisited
/*
   sortEnglishLonghandDateFormat
   -----------------------------

   This custom sort function sorts dates of the format:

   "12th April, 2006" or "12 April 2006" or "12-4-2006" or "12 April" or "12 4" or "12 Apr 2006" etc

   The function expects dates to be in the format day/month/year. Should no year be stipulated,
   the function treats the year as being the current year.

   The function is "safe" i.e. non-date data (like the word "Unknown") can be passed in and is sorted properly.
*/
var sortEnglishLonghandDateFormat = fdTableSort.sortNumeric;

function sortEnglishLonghandDateFormatPrepareData(tdNode, innerText) {
        var months = ['january','february','march','april','may','june','july','august','september','october','november','december'];

        var aa = innerText.toLowerCase();

        // Replace the longhand months with an integer equivalent
        for(var i = 0; i < 12; i++) {
                aa = aa.replace(months[i], i+1).replace(months[i].substring(0,3), i+1);
        }

        // If there are still alpha characters then return -1
        if(aa.search(/a-z/) != -1) return -1;

        // Replace multiple spaces and anything that is not numeric

        aa = aa.replace(/\s+/g, " ").replace(/[^\d\s]/g, "");

        // If were left with nothing then return -1
        if(aa.replace(" ", "") == "") return -1;

        // Split on the (now) single spaces
        aa = aa.split(" ");

        // If something has gone terribly wrong then return -1
        if(aa.length < 2) return -1;

        // If no year stipulated, then add this year as default
        if(aa.length == 2) {
                aa[2] = String(new Date().getFullYear());
        }

        // Equalise the day and month
        if(aa[0].length < 2) aa[0] = "0" + String(aa[0]);
        if(aa[1].length < 2) aa[1] = "0" + String(aa[1]);

        // Deal with Y2K issues
        if(aa[2].length != 4) {
                aa[2] = (parseInt(aa[2]) < 50) ? '20' + aa[2] : '19' + aa[2];
        }

        // YMD (can be used as integer during comparison)
        return aa[2] + String(aa[1]) + aa[0];
}