cutting down my JS file!

I built a JS Object called js_SuperDate which is totally compatible with the standard Date() object, but with extended features, such as complete date-to-string manipulation, plus an offset date function which allows you to do the stuff you were doing, and a very rudimentary date command parser (it's crap, but works). I have been meaning to add DatePart and DateAdd functions, but haven't got round to it...

It is long, but just put it in it's own js file and include it...

Anyway, here you go:

      /*
       * Super date function!!!
        */
      function js_SuperDate()
      {
            if (arguments.length > 0)
                  this.dt = new Date(arguments[0] + '');
            else
                  this.dt = new Date();
      }

// mirror the same interface as the Date() object:
      js_SuperDate.prototype.Months = ['January',      'February', 'March',      'April',      'May',            'June',            'July',      'August', 'September', 'October', 'November', 'December'];
      js_SuperDate.prototype.Days   = ['Sunday',      'Monday',      'Tuesday',      'Wednesday','Thursday', 'Friday',      'Saturday'];
      js_SuperDate.prototype.AMPM   = ['AM',            'PM'];

      js_SuperDate.prototype.getDate = function()
      {
            return this.dt.getDate();
      }

      js_SuperDate.prototype.getDay = function()
      {
            return this.dt.getDay();
      }

      js_SuperDate.prototype.getFullYear = function()
      {
            return this.dt.getFullYear();
      }

      js_SuperDate.prototype.getHours = function()
      {
            return this.dt.getHours();
      }

      js_SuperDate.prototype.getMilliseconds = function()
      {
            return this.dt.getMilliseconds();
      }

      js_SuperDate.prototype.getMinutes = function()
      {
            return this.dt.getMinutes();
      }

      js_SuperDate.prototype.getMonth = function()
      {
            return this.dt.getMonth();
      }

      js_SuperDate.prototype.getSeconds = function()
      {
            return this.dt.getSeconds();
      }

      js_SuperDate.prototype.getTime = function()
      {
            return this.dt.getTime();
      }

      js_SuperDate.prototype.getTimezoneOffset = function()
      {
            return this.dt.getTimezoneOffset();
      }

      js_SuperDate.prototype.getUTCDate = function()
      {
            return this.dt.getUTCDate();
      }

      js_SuperDate.prototype.getUTCDay = function()
      {
            return this.dt.getUTCDay();
      }

      js_SuperDate.prototype.getUTCFullYear = function()
      {
            return this.dt.getUTCFullYear();
      }

      js_SuperDate.prototype.getUTCHours = function()
      {
            return this.dt.getUTCHours();
      }

      js_SuperDate.prototype.getUTCMilliseconds = function()
      {
            return this.dt.getUTCMinutes();
      }

      js_SuperDate.prototype.getUTCMonth = function()
      {
            return this.dt.getUTCMonth();
      }

      js_SuperDate.prototype.getUTCSeconds = function()
      {
            return this.dt.getUTCSeconds();
      }

      js_SuperDate.prototype.getYear = function()
      {
            return this.dt.getYear();
      }

      js_SuperDate.prototype.parse = function(_in)
      {
            return this.dt.parse(_in);
      }

      js_SuperDate.prototype.setDate = function(_in)
      {
            return this.dt.setDate(_in);
      }

      js_SuperDate.prototype.setFullYear = function(_in)
      {
            return this.dt.setFullYear(_in);
      }

      js_SuperDate.prototype.setHours = function(_in)
      {
            return this.dt.setHours(_in);
      }

      js_SuperDate.prototype.setMilliseconds = function(_in)
      {
            return this.dt.setMilliseconds(_in);
      }

      js_SuperDate.prototype.setMinutes = function(_in)
      {
            return this.dt.setMinutes(_in);
      }

      js_SuperDate.prototype.setMonth = function(_in)
      {
            return this.dt.setMonth(_in);
      }

      js_SuperDate.prototype.setSeconds = function(_in)
      {
            return this.dt.setSeconds(_in);
      }

      js_SuperDate.prototype.setTime = function(_in)
      {
            return this.dt.setTime(_in);
      }

      js_SuperDate.prototype.setUTCDate = function(_in)
      {
            return this.dt.setUTCDate(_in);
      }

      js_SuperDate.prototype.setUTCFullYear = function(_in)
      {
            return this.dt.setUTCFullYear(_in);
      }

      js_SuperDate.prototype.setUTCHours = function(_in)
      {
            return this.dt.setUTCHours(_in);
      }

      js_SuperDate.prototype.setUTCMilliseconds = function(_in)
      {
            return this.dt.setUTCMilliseconds(_in);
      }

      js_SuperDate.prototype.setUTCMinutes = function(_in)
      {
            return this.dt.setUTCMinutes(_in);
      }

      js_SuperDate.prototype.setUTCMonth = function(_in)
      {
            return this.dt.setUTCMonth(_in);
      }

      js_SuperDate.prototype.setUTCSeconds = function(_in)
      {
            return this.dt.setUTCSeconds(_in);
      }

      js_SuperDate.prototype.setYear = function(_in)
      {
            return this.dt.setYear(_in);
      }

      js_SuperDate.prototype.toGMTString = function()
      {
            return this.dt.toGMTString();
      }

      js_SuperDate.prototype.toLocaleString = function()
      {
            return this.dt.toLocaleString();
      }

      js_SuperDate.prototype.toString = function()
      {
            return this.dt.toString();
      }

      js_SuperDate.prototype.toUTCString = function()
      {
            return this.dt.toUTCString();
      }

      js_SuperDate.prototype.UTC = function()
      {
            return this.dt.UTC();
      }

      js_SuperDate.prototype.valueOf = function()
      {
            return this.dt.valueOf();
      }

// GMT-named versions of UTC
      js_SuperDate.prototype.getGMTDate = function()
      {
            return this.getUTCDate();
      }

      js_SuperDate.prototype.getGMTDay = function()
      {
            return this.getUTCDay();
      }

      js_SuperDate.prototype.getGMTFullYear = function()
      {
            return this.getUTCFullYear();
      }

      js_SuperDate.prototype.getGMTHours = function()
      {
            return this.getUTCHours();
      }

      js_SuperDate.prototype.getGMTMilliseconds = function()
      {
            return this.getUTCMinutes();
      }

      js_SuperDate.prototype.getGMTMonth = function()
      {
            return this.getUTCMonth();
      }

      js_SuperDate.prototype.getGMTSeconds = function()
      {
            return this.getUTCSeconds();
      }

      js_SuperDate.prototype.setGMTDate = function(_in)
      {
            return this.setUTCDate(_in);
      }

      js_SuperDate.prototype.setGMTFullYear = function(_in)
      {
            return this.setUTCFullYear(_in);
      }

      js_SuperDate.prototype.setGMTHours = function(_in)
      {
            return this.setUTCHours(_in);
      }

      js_SuperDate.prototype.setGMTMilliseconds = function(_in)
      {
            return this.setUTCMilliseconds(_in);
      }

      js_SuperDate.prototype.setGMTMinutes = function(_in)
      {
            return this.setUTCMinutes(_in);
      }

      js_SuperDate.prototype.setGMTMonth = function(_in)
      {
            return this.setUTCMonth(_in);
      }

      js_SuperDate.prototype.setGMTSeconds = function(_in)
      {
            return this.setUTCSeconds(_in);
      }

      js_SuperDate.prototype.GMT = function()
      {
            return this.UTC();
      }

// Strings
      js_SuperDate.prototype.getStrd = function()
      {
            var ret = this.getDate()+'';
            return ret;
      }


      js_SuperDate.prototype.getStrdd = function()
      {
            var ret = this.getDate()+'';
            if (ret.length < 2)
                  ret = '0' + ret;
            return ret;
      }

      js_SuperDate.prototype.getStrM = function()
      {
            var ret = (this.getMonth()+1)+'';
            return ret;
      }

      js_SuperDate.prototype.getStrMM = function()
      {
            var ret = (this.getMonth()+1)+'';
            if (ret.length < 2)
                  ret = '0' + ret;
            return ret;
      }

      js_SuperDate.prototype.getStrMMM = function()
      {
            return this.Months[this.getMonth()].substring(0,3)+'';
      }

      js_SuperDate.prototype.getStrMMMM = function()
      {
            return this.Months[this.getMonth()]+'';
      }

      js_SuperDate.prototype.getStrmmm = function()
      {
            return this.getStrMMM();
      }

      js_SuperDate.prototype.getStrmmmm = function()
      {
            return this.getStrMMMM();
      }

      js_SuperDate.prototype.getStrD = function()
      {
            return this.Days[this.getDay()].substring(0,1)+'';
      }

      js_SuperDate.prototype.getStrDD = function()
      {
            return this.Days[this.getDay()].substring(0,2)+'';
      }

      js_SuperDate.prototype.getStrDDD = function()
      {
            return this.Days[this.getDay()].substring(0,3)+'';
      }

      js_SuperDate.prototype.getStrDDDD = function()
      {
            return this.Days[this.getDay()]+'';
      }

      js_SuperDate.prototype.getStrY = function()
      {
            return (this.getFullYear()+'').substring(3,4)+'';
      }

      js_SuperDate.prototype.getStrYY = function()
      {
            return (this.getFullYear()+'').substring(2,4)+'';
      }

      js_SuperDate.prototype.getStrYYYY = function()
      {
            return this.getFullYear()+'';
      }

      js_SuperDate.prototype.getStry = function()
      {
            return this.getStrY();
      }

      js_SuperDate.prototype.getStryy = function()
      {
            return this.getStrYY();
      }

      js_SuperDate.prototype.getStryyyy = function()
      {
            return this.getStrYYYY();
      }

      js_SuperDate.prototype.getStrH = function()
      {
            var ret = this.getHours()+'';
            return ret;
      }

      js_SuperDate.prototype.getStrHH = function()
      {
            var ret = this.getHours()+'';
            if (ret.length < 2)
                  ret = '0' + ret;
            return ret;
      }

      js_SuperDate.prototype.getStrh = function()
      {
            var ret = '';
            if (this.getHours() < 13)
                  ret = this.getHours()+'';
            else
                  ret = (this.getHours() - 12) +'';
            return ret;
      }

      js_SuperDate.prototype.getStrhh = function()
      {
            var ret = '';;
            if (this.getHours() < 13)
                  ret = this.getHours()+'';
            else
                  ret = (this.getHours() - 12)+'';
            if (ret.length < 2)
                  ret = '0' + ret;
            return ret;
      }

      js_SuperDate.prototype.getStrm = function()
      {
            var ret = this.getMinutes()+'';
            return ret;
      }

      js_SuperDate.prototype.getStrmm = function()
      {
            var ret = this.getMinutes()+'';
            if (ret.length < 2)
                  ret = '0' + ret;
            return ret;
      }

      js_SuperDate.prototype.getStrS = function()
      {
            var ret = this.getSeconds()+'';
            return ret;
      }

      js_SuperDate.prototype.getStrSS = function()
      {
            var ret = this.getSeconds()+'';
            if (ret.length < 2)
                  ret = '0' + ret;
            return ret;
      }

      js_SuperDate.prototype.getStrs = function()
      {
            return this.getStrS();
      }

      js_SuperDate.prototype.getStrss = function()
      {
            return this.getStrSS();
      }

      js_SuperDate.prototype.getStr000 = function()
      {
            var ret = this.getMilliseconds()+'';
            if (ret.length < 3)
                  ret = '0' + ret;
            else if (ret.length < 2)
                  ret = '00' + ret;
            return ret;
      }

      js_SuperDate.prototype.getStr0 = function()
      {
            return this.getMilliseconds()+'';
      }

      js_SuperDate.prototype.getStrTT = function()
      {
            var ret = '';;
            if (this.getHours() < 13)
                  ret = this.AMPM[0].toUpperCase()+'';
            else
                  ret = this.AMPM[1].toUpperCase()+'';
            return ret;
      }

      js_SuperDate.prototype.getStrtt = function()
      {
            var ret = '';;
            if (this.getHours() < 13)
                  ret = this.AMPM[0].toLowerCase()+'';
            else
                  ret = this.AMPM[1].toLowerCase()+'';
            return ret;
      }


// Date Command Parser
      js_SuperDate.prototype.getDateString = function(_cmd)
      {
            var delim = ' ';
            if (arguments.length > 1)
                  delim = arguments[1];
            var illegalChars = [' ','!','"','£','$','%','^','&','*','(',')','-','_','=','+','{','}','[',']',';',':','@',"'",'~','#','<','>',',','.','/','?','\\','|']
            var cmd = _cmd + '';
            var cmd_clean = '';
            for (i = 0; i < cmd.length; ++i)
            {
                  var charOK = true;
                  var tChar  = cmd.charAt(i);
                  for (j = 0; j < illegalChars.length; ++j)
                  {
                        if (tChar == illegalChars[j] && tChar != delim)
                              charOK = false;
                  }
                  if (charOK)
                        cmd_clean += tChar;
            }
            var cmds = cmd_clean.split(delim);
            var legalEntities = ['d','dd','D','DD','DDD','DDDD','m','mm','M','MM','MMM','MMMM','Y','YY','YYYY','y','yy','yyyy','H','HH','h','hh','S','SS','s','ss','TT','tt','0','000']
            var ret = '';
            for (i = 0; i < cmds.length; ++i)
            {
                  var cmdOK = false
                  for (j = 0; j < legalEntities.length; j++)
                  {
                        if (cmds[i] == legalEntities[j])
                              cmdOK = true;
                  }
                  if (cmdOK)
                  {
                        if (i > 0)
                              ret += delim;
                        ret += eval('this.getStr' + cmds[i] + '()');
                  }
            }
            return ret;
      }

// DB-usable date string
      js_SuperDate.prototype.getDBDate = function()
      {
            // dd-MMM-yyyy
            return this.getStrdd() + '-' + this.getStrMMM() + '-' + this.getFullYear();
      }

      js_SuperDate.prototype.getShortDate = function()
      {
            // dd-MMM-yyyy
            return this.getStrd() + ' ' + this.getStrMMM() + ' ' + this.getFullYear();
      }

// RFC-1123 dateformat
      js_SuperDate.prototype.getRFC1123Date = function()
      {
            // dd-MMM-yyyy
            return this.getStrMMM() + ' ' + this.getStrdd() + ', ' + this.getFullYear() + ' ' + this.getStrHH() + ':' + this.getStrmm() + ':' + this.getStrSS();
      }


      var now = new js_SuperDate();

      function js_OffsetDate(_period,_timeunit)
      {
            var td = new js_SuperDate();
            var n = td.getTime();
            switch(_timeunit)
            {
                  case 'Y' :
                        // year
                        td.setTime(n + (_period * 31557600000));
                        break;
                  case 'M' :
                        // month
                        td.setTime(n + (_period * 2629800000));
                        break;
                  case 'd' :
                        // day
                        td.setTime(n + (_period * 86400000));
                        break;
                  case 'D' :
                        // day
                        td.setTime(n + (_period * 86400000));
                        break;
                  case 'H' :
                        // hour
                        td.setTime(n + (_period * 3600000));
                        break;
                  case 'm' :
                        // minute
                        td.setTime(n + (_period * 60000));
                        break;
                  case 'S' :
                        // seconds
                        td.setTime(n + (_period * 1000));
                        break;
                  case '0' :
                        // milliseconds
                        td.setTime(n + _period);
                        break;
            }
            return td.toGMTString();
      }