Skip to content

@xaprb /date-functions.js
Created

Embed URL

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
/*
* Copyright (C) 2004 Baron Schwartz <baron at sequent dot org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, version 2.1.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*/
Date.parseFunctions = {count:0};
Date.parseRegexes = [];
Date.formatFunctions = {count:0};
Date.prototype.dateFormat = function(format) {
if (Date.formatFunctions[format] == null) {
Date.createNewFormat(format);
}
var func = Date.formatFunctions[format];
return this[func]();
}
Date.createNewFormat = function(format) {
var funcName = "format" + Date.formatFunctions.count++;
Date.formatFunctions[format] = funcName;
var code = "Date.prototype." + funcName + " = function(){return ";
var special = false;
var ch = '';
for (var i = 0; i < format.length; ++i) {
ch = format.charAt(i);
if (!special && ch == "\\") {
special = true;
}
else if (special) {
special = false;
code += "'" + String.escape(ch) + "' + ";
}
else {
code += Date.getFormatCode(ch);
}
}
eval(code.substring(0, code.length - 3) + ";}");
}
Date.getFormatCode = function(character) {
switch (character) {
case "d":
return "String.leftPad(this.getDate(), 2, '0') + ";
case "D":
return "Date.dayNames[this.getDay()].substring(0, 3) + ";
case "j":
return "this.getDate() + ";
case "l":
return "Date.dayNames[this.getDay()] + ";
case "S":
return "this.getSuffix() + ";
case "w":
return "this.getDay() + ";
case "z":
return "this.getDayOfYear() + ";
case "W":
return "this.getWeekOfYear() + ";
case "F":
return "Date.monthNames[this.getMonth()] + ";
case "m":
return "String.leftPad(this.getMonth() + 1, 2, '0') + ";
case "M":
return "Date.monthNames[this.getMonth()].substring(0, 3) + ";
case "n":
return "(this.getMonth() + 1) + ";
case "t":
return "this.getDaysInMonth() + ";
case "L":
return "(this.isLeapYear() ? 1 : 0) + ";
case "Y":
return "this.getFullYear() + ";
case "y":
return "('' + this.getFullYear()).substring(2, 4) + ";
case "a":
return "(this.getHours() < 12 ? 'am' : 'pm') + ";
case "A":
return "(this.getHours() < 12 ? 'AM' : 'PM') + ";
case "g":
return "((this.getHours() %12) ? this.getHours() % 12 : 12) + ";
case "G":
return "this.getHours() + ";
case "h":
return "String.leftPad((this.getHours() %12) ? this.getHours() % 12 : 12, 2, '0') + ";
case "H":
return "String.leftPad(this.getHours(), 2, '0') + ";
case "i":
return "String.leftPad(this.getMinutes(), 2, '0') + ";
case "s":
return "String.leftPad(this.getSeconds(), 2, '0') + ";
case "O":
return "this.getGMTOffset() + ";
case "T":
return "this.getTimezone() + ";
case "Z":
return "(this.getTimezoneOffset() * -60) + ";
default:
return "'" + String.escape(character) + "' + ";
}
}
Date.parseDate = function(input, format) {
if (Date.parseFunctions[format] == null) {
Date.createParser(format);
}
var func = Date.parseFunctions[format];
return Date[func](input);
}
Date.createParser = function(format) {
var funcName = "parse" + Date.parseFunctions.count++;
var regexNum = Date.parseRegexes.length;
var currentGroup = 1;
Date.parseFunctions[format] = funcName;
var code = "Date." + funcName + " = function(input){\n"
+ "var y = -1, m = -1, d = -1, h = -1, i = -1, s = -1;\n"
+ "var d = new Date();\n"
+ "y = d.getFullYear();\n"
+ "m = d.getMonth();\n"
+ "d = d.getDate();\n"
+ "var results = input.match(Date.parseRegexes[" + regexNum + "]);\n"
+ "if (results && results.length > 0) {"
var regex = "";
var special = false;
var ch = '';
for (var i = 0; i < format.length; ++i) {
ch = format.charAt(i);
if (!special && ch == "\\") {
special = true;
}
else if (special) {
special = false;
regex += String.escape(ch);
}
else {
obj = Date.formatCodeToRegex(ch, currentGroup);
currentGroup += obj.g;
regex += obj.s;
if (obj.g && obj.c) {
code += obj.c;
}
}
}
code += "if (y > 0 && m >= 0 && d > 0 && h >= 0 && i >= 0 && s >= 0)\n"
+ "{return new Date(y, m, d, h, i, s);}\n"
+ "else if (y > 0 && m >= 0 && d > 0 && h >= 0 && i >= 0)\n"
+ "{return new Date(y, m, d, h, i);}\n"
+ "else if (y > 0 && m >= 0 && d > 0 && h >= 0)\n"
+ "{return new Date(y, m, d, h);}\n"
+ "else if (y > 0 && m >= 0 && d > 0)\n"
+ "{return new Date(y, m, d);}\n"
+ "else if (y > 0 && m >= 0)\n"
+ "{return new Date(y, m);}\n"
+ "else if (y > 0)\n"
+ "{return new Date(y);}\n"
+ "}return null;}";
Date.parseRegexes[regexNum] = new RegExp("^" + regex + "$");
eval(code);
}
Date.formatCodeToRegex = function(character, currentGroup) {
switch (character) {
case "D":
return {g:0,
c:null,
s:"(?:Sun|Mon|Tue|Wed|Thu|Fri|Sat)"};
case "j":
case "d":
return {g:1,
c:"d = parseInt(results[" + currentGroup + "], 10);\n",
s:"(\\d{1,2})"};
case "l":
return {g:0,
c:null,
s:"(?:" + Date.dayNames.join("|") + ")"};
case "S":
return {g:0,
c:null,
s:"(?:st|nd|rd|th)"};
case "w":
return {g:0,
c:null,
s:"\\d"};
case "z":
return {g:0,
c:null,
s:"(?:\\d{1,3})"};
case "W":
return {g:0,
c:null,
s:"(?:\\d{2})"};
case "F":
return {g:1,
c:"m = parseInt(Date.monthNumbers[results[" + currentGroup + "].substring(0, 3)], 10);\n",
s:"(" + Date.monthNames.join("|") + ")"};
case "M":
return {g:1,
c:"m = parseInt(Date.monthNumbers[results[" + currentGroup + "]], 10);\n",
s:"(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)"};
case "n":
case "m":
return {g:1,
c:"m = parseInt(results[" + currentGroup + "], 10) - 1;\n",
s:"(\\d{1,2})"};
case "t":
return {g:0,
c:null,
s:"\\d{1,2}"};
case "L":
return {g:0,
c:null,
s:"(?:1|0)"};
case "Y":
return {g:1,
c:"y = parseInt(results[" + currentGroup + "], 10);\n",
s:"(\\d{4})"};
case "y":
return {g:1,
c:"var ty = parseInt(results[" + currentGroup + "], 10);\n"
+ "y = ty > Date.y2kYear ? 1900 + ty : 2000 + ty;\n",
s:"(\\d{1,2})"};
case "a":
return {g:1,
c:"if (results[" + currentGroup + "] == 'am') {\n"
+ "if (h == 12) { h = 0; }\n"
+ "} else { if (h < 12) { h += 12; }}",
s:"(am|pm)"};
case "A":
return {g:1,
c:"if (results[" + currentGroup + "] == 'AM') {\n"
+ "if (h == 12) { h = 0; }\n"
+ "} else { if (h < 12) { h += 12; }}",
s:"(AM|PM)"};
case "g":
case "G":
case "h":
case "H":
return {g:1,
c:"h = parseInt(results[" + currentGroup + "], 10);\n",
s:"(\\d{1,2})"};
case "i":
return {g:1,
c:"i = parseInt(results[" + currentGroup + "], 10);\n",
s:"(\\d{2})"};
case "s":
return {g:1,
c:"s = parseInt(results[" + currentGroup + "], 10);\n",
s:"(\\d{2})"};
case "O":
return {g:0,
c:null,
s:"[+-]\\d{4}"};
case "T":
return {g:0,
c:null,
s:"[A-Z]{3}"};
case "Z":
return {g:0,
c:null,
s:"[+-]\\d{1,5}"};
default:
return {g:0,
c:null,
s:String.escape(character)};
}
}
Date.prototype.getTimezone = function() {
return this.toString().replace(
/^.*? ([A-Z]{3}) [0-9]{4}.*$/, "$1").replace(
/^.*?\(([A-Z])[a-z]+ ([A-Z])[a-z]+ ([A-Z])[a-z]+\)$/, "$1$2$3");
}
Date.prototype.getGMTOffset = function() {
return (this.getTimezoneOffset() > 0 ? "-" : "+")
+ String.leftPad(Math.floor(this.getTimezoneOffset() / 60), 2, "0")
+ String.leftPad(this.getTimezoneOffset() % 60, 2, "0");
}
Date.prototype.getDayOfYear = function() {
var num = 0;
Date.daysInMonth[1] = this.isLeapYear() ? 29 : 28;
for (var i = 0; i < this.getMonth(); ++i) {
num += Date.daysInMonth[i];
}
return num + this.getDate() - 1;
}
Date.prototype.getWeekOfYear = function() {
// Skip to Thursday of this week
var now = this.getDayOfYear() + (4 - this.getDay());
// Find the first Thursday of the year
var jan1 = new Date(this.getFullYear(), 0, 1);
var then = (7 - jan1.getDay() + 4);
document.write(then);
return String.leftPad(((now - then) / 7) + 1, 2, "0");
}
Date.prototype.isLeapYear = function() {
var year = this.getFullYear();
return ((year & 3) == 0 && (year % 100 || (year % 400 == 0 && year)));
}
Date.prototype.getFirstDayOfMonth = function() {
var day = (this.getDay() - (this.getDate() - 1)) % 7;
return (day < 0) ? (day + 7) : day;
}
Date.prototype.getLastDayOfMonth = function() {
var day = (this.getDay() + (Date.daysInMonth[this.getMonth()] - this.getDate())) % 7;
return (day < 0) ? (day + 7) : day;
}
Date.prototype.getDaysInMonth = function() {
Date.daysInMonth[1] = this.isLeapYear() ? 29 : 28;
return Date.daysInMonth[this.getMonth()];
}
Date.prototype.getSuffix = function() {
switch (this.getDate()) {
case 1:
case 21:
case 31:
return "st";
case 2:
case 22:
return "nd";
case 3:
case 23:
return "rd";
default:
return "th";
}
}
String.escape = function(string) {
return string.replace(/('|\\)/g, "\\$1");
}
String.leftPad = function (val, size, ch) {
var result = new String(val);
if (ch == null) {
ch = " ";
}
while (result.length < size) {
result = ch + result;
}
return result;
}
Date.daysInMonth = [31,28,31,30,31,30,31,31,30,31,30,31];
Date.monthNames =
["January",
"February",
"March",
"April",
"May",
"June",
"July",
"August",
"September",
"October",
"November",
"December"];
Date.dayNames =
["Sunday",
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday"];
Date.y2kYear = 50;
Date.monthNumbers = {
Jan:0,
Feb:1,
Mar:2,
Apr:3,
May:4,
Jun:5,
Jul:6,
Aug:7,
Sep:8,
Oct:9,
Nov:10,
Dec:11};
Date.patterns = {
ISO8601LongPattern:"Y-m-d H:i:s",
ISO8601ShortPattern:"Y-m-d",
ShortDatePattern: "n/j/Y",
LongDatePattern: "l, F d, Y",
FullDateTimePattern: "l, F d, Y g:i:s A",
MonthDayPattern: "F d",
ShortTimePattern: "g:i A",
LongTimePattern: "g:i:s A",
SortableDateTimePattern: "Y-m-d\\TH:i:s",
UniversalSortableDateTimePattern: "Y-m-d H:i:sO",
YearMonthPattern: "F, Y"};
@demis-palma

The statement document.write(then); taints the output.

@kmturley

Can you remove the dependancy on the eval() function? It isn't allowed on sites with Content Security Policies enabled and is generally considered bad practice

@kmturley

I've created an example that doesn't use eval() here:
https://gist.github.com/kmturley/da90df8b19af500f5f61

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Something went wrong with that request. Please try again.