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350 lines
9.7 KiB
JavaScript
350 lines
9.7 KiB
JavaScript
/*
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Copyright (c) 2004-2010, The Dojo Foundation All Rights Reserved.
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Available via Academic Free License >= 2.1 OR the modified BSD license.
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see: http://dojotoolkit.org/license for details
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*/
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if(!dojo._hasResource["dojo.date"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
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dojo._hasResource["dojo.date"] = true;
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dojo.provide("dojo.date");
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/*=====
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dojo.date = {
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// summary: Date manipulation utilities
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}
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=====*/
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dojo.date.getDaysInMonth = function(/*Date*/dateObject){
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// summary:
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// Returns the number of days in the month used by dateObject
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var month = dateObject.getMonth();
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var days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
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if(month == 1 && dojo.date.isLeapYear(dateObject)){ return 29; } // Number
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return days[month]; // Number
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}
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dojo.date.isLeapYear = function(/*Date*/dateObject){
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// summary:
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// Determines if the year of the dateObject is a leap year
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// description:
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// Leap years are years with an additional day YYYY-02-29, where the
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// year number is a multiple of four with the following exception: If
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// a year is a multiple of 100, then it is only a leap year if it is
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// also a multiple of 400. For example, 1900 was not a leap year, but
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// 2000 is one.
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var year = dateObject.getFullYear();
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return !(year%400) || (!(year%4) && !!(year%100)); // Boolean
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}
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// FIXME: This is not localized
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dojo.date.getTimezoneName = function(/*Date*/dateObject){
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// summary:
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// Get the user's time zone as provided by the browser
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// dateObject:
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// Needed because the timezone may vary with time (daylight savings)
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// description:
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// Try to get time zone info from toString or toLocaleString method of
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// the Date object -- UTC offset is not a time zone. See
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// http://www.twinsun.com/tz/tz-link.htm Note: results may be
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// inconsistent across browsers.
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var str = dateObject.toString(); // Start looking in toString
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var tz = ''; // The result -- return empty string if nothing found
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var match;
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// First look for something in parentheses -- fast lookup, no regex
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var pos = str.indexOf('(');
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if(pos > -1){
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tz = str.substring(++pos, str.indexOf(')'));
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}else{
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// If at first you don't succeed ...
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// If IE knows about the TZ, it appears before the year
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// Capital letters or slash before a 4-digit year
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// at the end of string
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var pat = /([A-Z\/]+) \d{4}$/;
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if((match = str.match(pat))){
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tz = match[1];
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}else{
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// Some browsers (e.g. Safari) glue the TZ on the end
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// of toLocaleString instead of putting it in toString
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str = dateObject.toLocaleString();
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// Capital letters or slash -- end of string,
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// after space
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pat = / ([A-Z\/]+)$/;
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if((match = str.match(pat))){
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tz = match[1];
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}
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}
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}
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// Make sure it doesn't somehow end up return AM or PM
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return (tz == 'AM' || tz == 'PM') ? '' : tz; // String
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}
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// Utility methods to do arithmetic calculations with Dates
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dojo.date.compare = function(/*Date*/date1, /*Date?*/date2, /*String?*/portion){
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// summary:
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// Compare two date objects by date, time, or both.
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// description:
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// Returns 0 if equal, positive if a > b, else negative.
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// date1:
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// Date object
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// date2:
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// Date object. If not specified, the current Date is used.
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// portion:
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// A string indicating the "date" or "time" portion of a Date object.
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// Compares both "date" and "time" by default. One of the following:
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// "date", "time", "datetime"
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// Extra step required in copy for IE - see #3112
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date1 = new Date(+date1);
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date2 = new Date(+(date2 || new Date()));
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if(portion == "date"){
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// Ignore times and compare dates.
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date1.setHours(0, 0, 0, 0);
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date2.setHours(0, 0, 0, 0);
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}else if(portion == "time"){
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// Ignore dates and compare times.
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date1.setFullYear(0, 0, 0);
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date2.setFullYear(0, 0, 0);
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}
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if(date1 > date2){ return 1; } // int
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if(date1 < date2){ return -1; } // int
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return 0; // int
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};
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dojo.date.add = function(/*Date*/date, /*String*/interval, /*int*/amount){
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// summary:
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// Add to a Date in intervals of different size, from milliseconds to years
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// date: Date
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// Date object to start with
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// interval:
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// A string representing the interval. One of the following:
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// "year", "month", "day", "hour", "minute", "second",
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// "millisecond", "quarter", "week", "weekday"
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// amount:
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// How much to add to the date.
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var sum = new Date(+date); // convert to Number before copying to accomodate IE (#3112)
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var fixOvershoot = false;
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var property = "Date";
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switch(interval){
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case "day":
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break;
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case "weekday":
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//i18n FIXME: assumes Saturday/Sunday weekend, but this is not always true. see dojo.cldr.supplemental
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// Divide the increment time span into weekspans plus leftover days
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// e.g., 8 days is one 5-day weekspan / and two leftover days
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// Can't have zero leftover days, so numbers divisible by 5 get
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// a days value of 5, and the remaining days make up the number of weeks
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var days, weeks;
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var mod = amount % 5;
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if(!mod){
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days = (amount > 0) ? 5 : -5;
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weeks = (amount > 0) ? ((amount-5)/5) : ((amount+5)/5);
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}else{
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days = mod;
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weeks = parseInt(amount/5);
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}
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// Get weekday value for orig date param
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var strt = date.getDay();
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// Orig date is Sat / positive incrementer
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// Jump over Sun
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var adj = 0;
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if(strt == 6 && amount > 0){
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adj = 1;
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}else if(strt == 0 && amount < 0){
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// Orig date is Sun / negative incrementer
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// Jump back over Sat
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adj = -1;
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}
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// Get weekday val for the new date
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var trgt = strt + days;
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// New date is on Sat or Sun
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if(trgt == 0 || trgt == 6){
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adj = (amount > 0) ? 2 : -2;
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}
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// Increment by number of weeks plus leftover days plus
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// weekend adjustments
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amount = (7 * weeks) + days + adj;
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break;
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case "year":
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property = "FullYear";
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// Keep increment/decrement from 2/29 out of March
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fixOvershoot = true;
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break;
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case "week":
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amount *= 7;
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break;
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case "quarter":
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// Naive quarter is just three months
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amount *= 3;
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// fallthrough...
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case "month":
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// Reset to last day of month if you overshoot
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fixOvershoot = true;
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property = "Month";
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break;
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// case "hour":
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// case "minute":
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// case "second":
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// case "millisecond":
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default:
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property = "UTC"+interval.charAt(0).toUpperCase() + interval.substring(1) + "s";
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}
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if(property){
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sum["set"+property](sum["get"+property]()+amount);
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}
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if(fixOvershoot && (sum.getDate() < date.getDate())){
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sum.setDate(0);
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}
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return sum; // Date
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};
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dojo.date.difference = function(/*Date*/date1, /*Date?*/date2, /*String?*/interval){
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// summary:
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// Get the difference in a specific unit of time (e.g., number of
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// months, weeks, days, etc.) between two dates, rounded to the
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// nearest integer.
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// date1:
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// Date object
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// date2:
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// Date object. If not specified, the current Date is used.
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// interval:
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// A string representing the interval. One of the following:
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// "year", "month", "day", "hour", "minute", "second",
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// "millisecond", "quarter", "week", "weekday"
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// Defaults to "day".
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date2 = date2 || new Date();
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interval = interval || "day";
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var yearDiff = date2.getFullYear() - date1.getFullYear();
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var delta = 1; // Integer return value
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switch(interval){
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case "quarter":
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var m1 = date1.getMonth();
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var m2 = date2.getMonth();
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// Figure out which quarter the months are in
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var q1 = Math.floor(m1/3) + 1;
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var q2 = Math.floor(m2/3) + 1;
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// Add quarters for any year difference between the dates
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q2 += (yearDiff * 4);
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delta = q2 - q1;
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break;
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case "weekday":
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var days = Math.round(dojo.date.difference(date1, date2, "day"));
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var weeks = parseInt(dojo.date.difference(date1, date2, "week"));
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var mod = days % 7;
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// Even number of weeks
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if(mod == 0){
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days = weeks*5;
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}else{
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// Weeks plus spare change (< 7 days)
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var adj = 0;
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var aDay = date1.getDay();
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var bDay = date2.getDay();
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weeks = parseInt(days/7);
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mod = days % 7;
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// Mark the date advanced by the number of
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// round weeks (may be zero)
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var dtMark = new Date(date1);
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dtMark.setDate(dtMark.getDate()+(weeks*7));
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var dayMark = dtMark.getDay();
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// Spare change days -- 6 or less
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if(days > 0){
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switch(true){
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// Range starts on Sat
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case aDay == 6:
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adj = -1;
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break;
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// Range starts on Sun
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case aDay == 0:
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adj = 0;
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break;
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// Range ends on Sat
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case bDay == 6:
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adj = -1;
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break;
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// Range ends on Sun
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case bDay == 0:
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adj = -2;
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break;
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// Range contains weekend
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case (dayMark + mod) > 5:
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adj = -2;
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}
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}else if(days < 0){
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switch(true){
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// Range starts on Sat
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case aDay == 6:
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adj = 0;
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break;
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// Range starts on Sun
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case aDay == 0:
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adj = 1;
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break;
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// Range ends on Sat
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case bDay == 6:
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adj = 2;
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break;
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// Range ends on Sun
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case bDay == 0:
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adj = 1;
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break;
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// Range contains weekend
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case (dayMark + mod) < 0:
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adj = 2;
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}
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}
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days += adj;
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days -= (weeks*2);
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}
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delta = days;
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break;
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case "year":
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delta = yearDiff;
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break;
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case "month":
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delta = (date2.getMonth() - date1.getMonth()) + (yearDiff * 12);
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break;
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case "week":
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// Truncate instead of rounding
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// Don't use Math.floor -- value may be negative
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delta = parseInt(dojo.date.difference(date1, date2, "day")/7);
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break;
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case "day":
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delta /= 24;
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// fallthrough
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case "hour":
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delta /= 60;
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// fallthrough
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case "minute":
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delta /= 60;
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// fallthrough
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case "second":
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delta /= 1000;
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// fallthrough
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case "millisecond":
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delta *= date2.getTime() - date1.getTime();
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}
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// Round for fractional values and DST leaps
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return Math.round(delta); // Number (integer)
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};
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}
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