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// ===================================================================
// Author: Matt Kruse <matt@mattkruse.com>
// 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.
// If you wish to share this code with others, please just point them
// to the URL instead.
// Please DO NOT link directly to my .js files from your site. Copy
// the files to your server and use them there. Thank you.
// ===================================================================
// HISTORY
// ------------------------------------------------------------------
// May 17, 2003: Fixed bug in parseDate() for dates <1970
// March 11, 2003: Added parseDate() function
// March 11, 2003: Added "NNN" formatting option. Doesn't match up
// perfectly with SimpleDateFormat formats, but
// backwards-compatability was required.
// ------------------------------------------------------------------
// These functions use 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)
// | NNN (abbr.) |
// Day of Month | dd (2 digits) | d (1 or 2 digits)
// Day of Week | EE (name) | E (abbr)
// 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 |
//
// NOTE THE DIFFERENCE BETWEEN MM and mm! Month=MM, not mm!
// 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"
// ------------------------------------------------------------------
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"
);
var DAY_NAMES = new Array(
"Sunday",
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday",
"Sun",
"Mon",
"Tue",
"Wed",
"Thu",
"Fri",
"Sat"
);
function LZ(x) {
return (x < 0 || x > 9 ? "" : "0") + x;
}
// ------------------------------------------------------------------
// 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) {
if (val == "00/00/0000") return true;
else {
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, format) {
format = format + "";
var result = "";
var i_format = 0;
var c = "";
var token = "";
var y = date.getYear() + "";
var M = date.getMonth() + 1;
var d = date.getDate();
var E = date.getDay();
var H = date.getHours();
var m = date.getMinutes();
var s = date.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
var value = new Object();
if (y.length < 4) {
y = "" + (y - 0 + 1900);
}
value["y"] = "" + y;
value["yyyy"] = y;
value["yy"] = y.substring(2, 4);
value["M"] = M;
value["MM"] = LZ(M);
value["MMM"] = MONTH_NAMES[M - 1];
value["NNN"] = MONTH_NAMES[M + 11];
value["d"] = d;
value["dd"] = LZ(d);
value["E"] = DAY_NAMES[E + 7];
value["EE"] = DAY_NAMES[E];
value["H"] = H;
value["HH"] = LZ(H);
if (H == 0) {
value["h"] = 12;
} else if (H > 12) {
value["h"] = H - 12;
} else {
value["h"] = H;
}
value["hh"] = LZ(value["h"]);
if (H > 11) {
value["K"] = H - 12;
} else {
value["K"] = H;
}
value["k"] = H + 1;
value["KK"] = LZ(value["K"]);
value["kk"] = LZ(value["k"]);
if (H > 11) {
value["a"] = "PM";
} else {
value["a"] = "AM";
}
value["m"] = m;
value["mm"] = LZ(m);
value["s"] = s;
value["ss"] = LZ(s);
while (i_format < format.length) {
c = format.charAt(i_format);
token = "";
while (format.charAt(i_format) == c && i_format < format.length) {
token += format.charAt(i_format++);
}
if (value[token] != null) {
result = result + value[token];
} else {
result = result + token;
}
}
return 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 (var 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;
}
// ------------------------------------------------------------------
// 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.
// ------------------------------------------------------------------
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 = 1;
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++);
}
// Extract contents of value based on format token
if (token == "yyyy" || token == "yy" || token == "y") {
if (token == "yyyy") {
x = 4;
y = 4;
}
if (token == "yy") {
x = 2;
y = 2;
}
if (token == "y") {
x = 2;
y = 4;
}
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" || token == "NNN") {
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()
) {
if (token == "MMM" || (token == "NNN" && i > 11)) {
month = i + 1;
if (month > 12) {
month -= 12;
}
i_val += month_name.length;
break;
}
}
}
if (month < 1 || month > 12) {
return 0;
}
} else if (token == "EE" || token == "E") {
for (var i = 0; i < DAY_NAMES.length; i++) {
var day_name = DAY_NAMES[i];
if (
val.substring(i_val, i_val + day_name.length).toLowerCase() ==
day_name.toLowerCase()
) {
i_val += day_name.length;
break;
}
}
} else if (token == "MM" || token == "M") {
month = _getInt(val, i_val, token.length, 2);
if (month == null || month < 1 || month > 12) {
return 0;
}
i_val += month.length;
} else if (token == "dd" || token == "d") {
date = _getInt(val, i_val, token.length, 2);
if (date == null || date < 1 || date > 31) {
return 0;
}
i_val += date.length;
} else if (token == "hh" || token == "h") {
hh = _getInt(val, i_val, token.length, 2);
if (hh == null || hh < 1 || hh > 12) {
return 0;
}
i_val += hh.length;
} else if (token == "HH" || token == "H") {
hh = _getInt(val, i_val, token.length, 2);
if (hh == null || hh < 0 || hh > 23) {
return 0;
}
i_val += hh.length;
} else if (token == "KK" || token == "K") {
hh = _getInt(val, i_val, token.length, 2);
if (hh == null || hh < 0 || hh > 11) {
return 0;
}
i_val += hh.length;
} else if (token == "kk" || token == "k") {
hh = _getInt(val, i_val, token.length, 2);
if (hh == null || hh < 1 || hh > 24) {
return 0;
}
i_val += hh.length;
hh--;
} else if (token == "mm" || token == "m") {
mm = _getInt(val, i_val, token.length, 2);
if (mm == null || mm < 0 || mm > 59) {
return 0;
}
i_val += mm.length;
} else if (token == "ss" || token == "s") {
ss = _getInt(val, i_val, token.length, 2);
if (ss == null || 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;
}
i_val += 2;
} 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 0;
}
} else {
if (date > 28) {
return 0;
}
}
}
if (month == 4 || month == 6 || month == 9 || month == 11) {
if (date > 30) {
return 0;
}
}
// Correct hours value
if (hh < 12 && ampm == "PM") {
hh = hh - 0 + 12;
} else if (hh > 11 && ampm == "AM") {
hh -= 12;
}
var newdate = new Date(year, month - 1, date, hh, mm, ss);
return newdate.getTime();
}
// ------------------------------------------------------------------
// parseDate( date_string [, prefer_euro_format] )
//
// This function takes a date string and tries to match it to a
// number of possible date formats to get the value. It will try to
// match against the following international formats, in this order:
// y-M-d MMM d, y MMM d,y y-MMM-d d-MMM-y MMM d
// M/d/y M-d-y M.d.y MMM-d M/d M-d
// d/M/y d-M-y d.M.y d-MMM d/M d-M
// A second argument may be passed to instruct the method to search
// for formats like d/M/y (european format) before M/d/y (American).
// Returns a Date object or null if no patterns match.
// ------------------------------------------------------------------
function parseDate(val) {
var preferEuro = arguments.length == 2 ? arguments[1] : false;
generalFormats = new Array(
"y-M-d",
"MMM d, y",
"MMM d,y",
"y-MMM-d",
"d-MMM-y",
"MMM d"
);
monthFirst = new Array("M/d/y", "M-d-y", "M.d.y", "MMM-d", "M/d", "M-d");
dateFirst = new Array("d/M/y", "d-M-y", "d.M.y", "d-MMM", "d/M", "d-M");
var checkList = new Array(
"generalFormats",
preferEuro ? "dateFirst" : "monthFirst",
preferEuro ? "monthFirst" : "dateFirst"
);
var d = null;
for (var i = 0; i < checkList.length; i++) {
var l = window[checkList[i]];
for (var j = 0; j < l.length; j++) {
d = getDateFromFormat(val, l[j]);
if (d != 0) {
return new Date(d);
}
}
}
return null;
}
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