// ===================================================================
// Author: Matt Kruse <mkruse@netexpress.net>
// WWW: http://www.mattkruse.com/
//
// NOTICE: You may use this code for any purpose, commercial or
// private, without any further permission from the author. You may
// remove this notice from your final code if you wish, however it is
// appreciated by the author if at least my web site address is kept.
//
// You may *NOT* re-distribute this code in any way except through its
// use. That means, you can include it in your product, or your web
// site, or any other form where the code is actually being used. You
// may not put the plain javascript up on your site for download or
// include it in your javascript libraries for download. Instead,
// please just point to my URL to ensure the most up-to-date versions
// of the files. Thanks.
// ===================================================================

var MONTH_NAMES = new Array('January','February','March','April','May','June','July','August','September','October','November','December','Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec');

// ------------------------------------------------------------------
// isDate ( date_string, format_string )
//
// Returns true if date string matches format of format string and
// is a valid date. Else returns false.
//
// It is recommended that you trim whitespace around the value before
// passing it to this function, as whitespace is NOT ignored!
// ------------------------------------------------------------------
function isDate(val,format) {
        var date = getDateFromFormat(val,format);
        if (date == 0) { return false; }
        return true;
        }

// -------------------------------------------------------------------
// compareDates(date1,date1format,date2,date2format)
//   Compare two date strings to see which is greater.
//   Returns:
//   1 if date1 is greater than date2
//   0 if date2 is greater than date1 of if they are the same
//  -1 if either of the dates is in an invalid format
// -------------------------------------------------------------------
function compareDates(date1,dateformat1,date2,dateformat2) {
        var d1 = getDateFromFormat(date1,dateformat1);
        var d2 = getDateFromFormat(date2,dateformat2);
        if (d1==0 || d2==0) {
                return -1;
                }
        else if (d1 > d2) {
                return 1;
                }
        return 0;
        }

// ------------------------------------------------------------------
// formatDate (date_object, format)
//
// Returns a date in the output format specified.
// The format string uses the same abbreviations as in getDateFromFormat()
// ------------------------------------------------------------------
function formatDate(date) {
        if (date.value.substring(0,4)==Number(date.value.substring(0,4))&&date.value.substring(5,7)==Number(date.value.substring(5,7))&&date.value.substring(8,10)==Number(date.value.substring(8,10))) { //test for correct format
                date.value=date.value.substring(0,4)+"-"+date.value.substring(5,7)+"-"+date.value.substring(8,10);
        } else {
        datev=new Date(date.value);
        format = "MM-dd-yyyy";
        var result = "";
        var i_format = 0;
        var c = "";
        var token = "";
        var y = datev.getYear()+"";
        var M = datev.getMonth()+1;
        var d = datev.getDate();
        var H = datev.getHours();
        var m = datev.getMinutes();
        var s = datev.getSeconds();
        var yyyy,yy,MMM,MM,dd,hh,h,mm,ss,ampm,HH,H,KK,K,kk,k;
        // Convert real date parts into formatted versions
        // Year
        if (y.length < 4) {
                if (y < 60) {
                        y = y-0+100;
                }
                y = y-0+1900;
                }
        y = ""+y;
        yyyy = y;
        yy = y.substring(2,4);
        // Month
        if (M < 10) { MM = "0"+M; }
                else { MM = M; }
        MMM = MONTH_NAMES[M-1];
        // Date
        if (d < 10) { dd = "0"+d; }
                else { dd = d; }
        // Hour
        h=H+1;
        K=H;
        k=H+1;
        if (h > 12) { h-=12; }
        if (h == 0) { h=12; }
        if (h < 10) { hh = "0"+h; }
                else { hh = h; }
        if (H < 10) { HH = "0"+K; }
                else { HH = H; }
        if (K > 11) { K-=12; }
        if (K < 10) { KK = "0"+K; }
                else { KK = K; }
        if (k < 10) { kk = "0"+k; }
                else { kk = k; }
        // AM/PM
        if (H > 11) { ampm="PM"; }
        else { ampm="AM"; }
        // Minute
        if (m < 10) { mm = "0"+m; }
                else { mm = m; }
        // Second
        if (s < 10) { ss = "0"+s; }
                else { ss = s; }
        // Now put them all into an object!
        var value = new Object();
        value["yyyy"] = yyyy;
        value["yy"] = yy;
        value["y"] = y;
        value["MMM"] = MMM;
        value["MM"] = MM;
        value["M"] = M;
        value["dd"] = dd;
        value["d"] = d;
        value["hh"] = hh;
        value["h"] = h;
        value["HH"] = HH;
        value["H"] = H;
        value["KK"] = KK;
        value["K"] = K;
        value["kk"] = kk;
        value["k"] = k;
        value["mm"] = mm;
        value["m"] = m;
        value["ss"] = ss;
        value["s"] = s;
        value["a"] = ampm;
        while (i_format < format.length) {
                // Get next token from format string
                c = format.charAt(i_format);
                token = "";
                while ((format.charAt(i_format) == c) && (i_format < format.length)) {
                        token += format.charAt(i_format);
                        i_format++;
                        }
                if (value[token] != null) {
                        result = result + value[token];
                        }
                else {
                        result = result + token;
                        }
                }
        date.value=result;
        }
        }

function formatDate1(date) {
        if (date.value.length==10&&date.value.substring(6,10)==Number(date.value.substring(6,10))&&date.value.substring(0,2)==Number(date.value.substring(0,2))&&date.value.substring(3,5)==Number(date.value.substring(3,5))) { //test for correct format
                date.value=date.value.substring(0,2)+"-"+date.value.substring(3,5)+"-"+date.value.substring(6,10);
        } else {
        datev=new Date(date.value);
        format = "MM-dd-yyyy";
        var result = "";
        var i_format = 0;
        var c = "";
        var token = "";
        var y = datev.getYear()+"";
        var M = datev.getMonth()+1;
        var d = datev.getDate();
        var H = datev.getHours();
        var m = datev.getMinutes();
        var s = datev.getSeconds();
        var yyyy,yy,MMM,MM,dd,hh,h,mm,ss,ampm,HH,H,KK,K,kk,k;
        // Convert real date parts into formatted versions
        // Year
        if (y.length < 4) {
                if (y < 60) {
                        y = y-0+100;
                }
                y = y-0+1900;
                }
        y = ""+y;
        yyyy = y;
        yy = y.substring(2,4);
        // Month
        if (M < 10) { MM = "0"+M; }
                else { MM = M; }
        MMM = MONTH_NAMES[M-1];
        // Date
        if (d < 10) { dd = "0"+d; }
                else { dd = d; }
        // Hour
        h=H+1;
        K=H;
        k=H+1;
        if (h > 12) { h-=12; }
        if (h == 0) { h=12; }
        if (h < 10) { hh = "0"+h; }
                else { hh = h; }
        if (H < 10) { HH = "0"+K; }
                else { HH = H; }
        if (K > 11) { K-=12; }
        if (K < 10) { KK = "0"+K; }
                else { KK = K; }
        if (k < 10) { kk = "0"+k; }
                else { kk = k; }
        // AM/PM
        if (H > 11) { ampm="PM"; }
        else { ampm="AM"; }
        // Minute
        if (m < 10) { mm = "0"+m; }
                else { mm = m; }
        // Second
        if (s < 10) { ss = "0"+s; }
                else { ss = s; }
        // Now put them all into an object!
        var value = new Object();
        value["yyyy"] = yyyy;
        value["yy"] = yy;
        value["y"] = y;
        value["MMM"] = MMM;
        value["MM"] = MM;
        value["M"] = M;
        value["dd"] = dd;
        value["d"] = d;
        value["hh"] = hh;
        value["h"] = h;
        value["HH"] = HH;
        value["H"] = H;
        value["KK"] = KK;
        value["K"] = K;
        value["kk"] = kk;
        value["k"] = k;
        value["mm"] = mm;
        value["m"] = m;
        value["ss"] = ss;
        value["s"] = s;
        value["a"] = ampm;
        while (i_format < format.length) {
                // Get next token from format string
                c = format.charAt(i_format);
                token = "";
                while ((format.charAt(i_format) == c) && (i_format < format.length)) {
                        token += format.charAt(i_format);
                        i_format++;
                        }
                if (value[token] != null) {
                        result = result + value[token];
                        }
                else {
                        result = result + token;
                        }
                }
        date.value=result;
        }
        }


// ------------------------------------------------------------------
// Utility functions for parsing in getDateFromFormat()
// ------------------------------------------------------------------
function _isInteger(val) {
        var digits = "1234567890";
        for (var i=0; i < val.length; i++) {
                if (digits.indexOf(val.charAt(i)) == -1) { return false; }
                }
        return true;
        }
function _getInt(str,i,minlength,maxlength) {
        for (x=maxlength; x>=minlength; x--) {
                var token = str.substring(i,i+x);
                if (token.length < minlength) {
                        return null;
                        }
                if (_isInteger(token)) {
                        return token;
                        }
                }
        return null;
        }
// ------------------------------------------------------------------
// END Utility Functions
// ------------------------------------------------------------------

// ------------------------------------------------------------------
// getDateFromFormat( date_string , format_string )
//
// This function takes a date string and a format string. It matches
// If the date string matches the format string, it returns the
// getTime() of the date. If it does not match, it returns 0.
//
// This function uses the same format strings as the
// java.text.SimpleDateFormat class, with minor exceptions.
//
// The format string consists of the following abbreviations:
//
// Field        | Full Form          | Short Form
// -------------+--------------------+-----------------------
// Year         | yyyy (4 digits)    | yy (2 digits), y (2 or 4 digits)
// Month        | MMM (name or abbr.)| MM (2 digits), M (1 or 2 digits)
// Day of Month | dd (2 digits)      | d (1 or 2 digits)
// Hour (1-12)  | hh (2 digits)      | h (1 or 2 digits)
// Hour (0-23)  | HH (2 digits)      | H (1 or 2 digits)
// Hour (0-11)  | KK (2 digits)      | K (1 or 2 digits)
// Hour (1-24)  | kk (2 digits)      | k (1 or 2 digits)
// Minute       | mm (2 digits)      | m (1 or 2 digits)
// Second       | ss (2 digits)      | s (1 or 2 digits)
// AM/PM        | a                  |
//
// Examples:
//  "MMM d, y" matches: January 01, 2000
//                      Dec 1, 1900
//                      Nov 20, 00
//  "m/d/yy"   matches: 01/20/00
//                      9/2/00
//  "MMM dd, yyyy hh:mm:ssa" matches: "January 01, 2000 12:30:45AM"
// ------------------------------------------------------------------
function getDateFromFormat(val,format) {
        val = val+"";
        format = format+"";
        var i_val = 0;
        var i_format = 0;
        var c = "";
        var token = "";
        var token2= "";
        var x,y;
        var now   = new Date();
        var year  = now.getYear();
        var month = now.getMonth()+1;
        var date  = now.getDate();
        var hh    = now.getHours();
        var mm    = now.getMinutes();
        var ss    = now.getSeconds();
        var ampm  = "";

        while (i_format < format.length) {
                // Get next token from format string
                c = format.charAt(i_format);
                token = "";
                while ((format.charAt(i_format) == c) && (i_format < format.length)) {
                        token += format.charAt(i_format);
                        i_format++;
                        }
                // Extract contents of value based on format token
                if (token=="yyyy" || token=="yy" || token=="y") {
                        if (token=="yyyy") { x=4;y=4; }// 4-digit year
                        if (token=="yy")   { x=2;y=2; }// 2-digit year
                        if (token=="y")    { x=2;y=4; }// 2-or-4-digit year
                        year = _getInt(val,i_val,x,y);
                        if (year == null) { return 0; }
                        i_val += year.length;
                        if (year.length == 2) {
                                if (year > 70) {
                                        year = 1900+(year-0);
                                        }
                                else {
                                        year = 2000+(year-0);
                                        }
                                }
                        }
                else if (token=="MMM"){// Month name
                        month = 0;
                        for (var i=0; i<MONTH_NAMES.length; i++) {
                                var month_name = MONTH_NAMES[i];
                                if (val.substring(i_val,i_val+month_name.length).toLowerCase() == month_name.toLowerCase()) {
                                        month = i+1;
                                        if (month>12) { month -= 12; }
                                        i_val += month_name.length;
                                        break;
                                        }
                                }
                        if (month == 0) { return 0; }
                        if ((month < 1) || (month>12)) { return 0; }
                        // TODO: Process Month Name
                        }
                else if (token=="MM" || token=="M") {
                        x=token.length; y=2;
                        month = _getInt(val,i_val,x,y);
                        if (month == null) { return 0; }
                        if ((month < 1) || (month > 12)) { return 0; }
                        i_val += month.length;
                        }
                else if (token=="dd" || token=="d") {
                        x=token.length; y=2;
                        date = _getInt(val,i_val,x,y);
                        if (date == null) { return 0; }
                        if ((date < 1) || (date>31)) { return 0; }
                        i_val += date.length;
                        }
                else if (token=="hh" || token=="h") {
                        x=token.length; y=2;
                        hh = _getInt(val,i_val,x,y);
                        if (hh == null) { return 0; }
                        if ((hh < 1) || (hh > 12)) { return 0; }
                        i_val += hh.length;
                        hh--;
                        }
                else if (token=="HH" || token=="H") {
                        x=token.length; y=2;
                        hh = _getInt(val,i_val,x,y);
                        if (hh == null) { return 0; }
                        if ((hh < 0) || (hh > 23)) { return 0; }
                        i_val += hh.length;
                        }
                else if (token=="KK" || token=="K") {
                        x=token.length; y=2;
                        hh = _getInt(val,i_val,x,y);
                        if (hh == null) { return 0; }
                        if ((hh < 0) || (hh > 11)) { return 0; }
                        i_val += hh.length;
                        }
                else if (token=="kk" || token=="k") {
                        x=token.length; y=2;
                        hh = _getInt(val,i_val,x,y);
                        if (hh == null) { return 0; }
                        if ((hh < 1) || (hh > 24)) { return 0; }
                        i_val += hh.length;
                        h--;
                        }
                else if (token=="mm" || token=="m") {
                        x=token.length; y=2;
                        mm = _getInt(val,i_val,x,y);
                        if (mm == null) { return 0; }
                        if ((mm < 0) || (mm > 59)) { return 0; }
                        i_val += mm.length;
                        }
                else if (token=="ss" || token=="s") {
                        x=token.length; y=2;
                        ss = _getInt(val,i_val,x,y);
                        if (ss == null) { return 0; }
                        if ((ss < 0) || (ss > 59)) { return 0; }
                        i_val += ss.length;
                        }
                else if (token=="a") {
                        if (val.substring(i_val,i_val+2).toLowerCase() == "am") {
                                ampm = "AM";
                                }
                        else if (val.substring(i_val,i_val+2).toLowerCase() == "pm") {
                                ampm = "PM";
                                }
                        else {
                                return 0;
                                }
                        }
                else {
                        if (val.substring(i_val,i_val+token.length) != token) {
                                return 0;
                                }
                        else {
                                i_val += token.length;
                                }
                        }
                }
        // If there are any trailing characters left in the value, it doesn't match
        if (i_val != val.length) {
                return 0;
                }
        // Is date valid for month?
        if (month == 2) {
                // Check for leap year
                if ( ( (year%4 == 0)&&(year%100 != 0) ) || (year%400 == 0) ) { // leap year
                        if (date > 29){ return false; }
                        }
                else {
                        if (date > 28) { return false; }
                        }
                }
        if ((month==4)||(month==6)||(month==9)||(month==11)) {
                if (date > 30) { return false; }
                }
        // Correct hours value
        if (hh<12 && ampm=="PM") {
                hh+=12;
                }
        else if (hh>11 && ampm=="AM") {
                hh-=12;
                }
        var newdate = new Date(year,month-1,date,hh,mm,ss);
        return newdate.getTime();
        }