javascript实现日期操作的工具包
最近一个小项目中用到了dwr，其中使用到了日期型数据；查了一下dwr的中文文档，上面推荐的日期型数据的工具包不错，贴在这里和大家分享，哈！这是这个工具包的网站：http://www.mattkruse.com/javascript/date/，当然上面还有很多工具包来！
工具包的代码：
// ===================================================================// 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) {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 versionsvar 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;value["NNN"]=MONTH_NAMES;value["d"]=d;value["dd"]=LZ(d);value["E"]=DAY_NAMES;value["EE"]=DAY_NAMES;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 != null) { result=result + value; }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 stringc=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 tokenif (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;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;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 matchif (i_val != val.length) { return 0; }// Is date valid for month?if (month==2) {// Check for leap yearif ( ( (year%4==0)&&(year%100 != 0) ) || (year%400==0) ) { // leap yearif (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 valueif (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-yMMM 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: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];for (var j=0; j<l.length; j++) {d=getDateFromFormat(val,l);if (d!=0) { return new Date(d); }}}return null;}
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