336 lines
13 KiB
JavaScript
336 lines
13 KiB
JavaScript
// ===================================================================
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// Author: Matt Kruse <matt@mattkruse.com>
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// WWW: http://www.mattkruse.com/
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//
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// NOTICE: You may use this code for any purpose, commercial or
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// private, without any further permission from the author. You may
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// remove this notice from your final code if you wish, however it is
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// appreciated by the author if at least my web site address is kept.
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//
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// You may *NOT* re-distribute this code in any way except through its
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// use. That means, you can include it in your product, or your web
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// site, or any other form where the code is actually being used. You
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// may not put the plain javascript up on your site for download or
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// include it in your javascript libraries for download.
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// If you wish to share this code with others, please just point them
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// to the URL instead.
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// Please DO NOT link directly to my .js files from your site. Copy
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// the files to your server and use them there. Thank you.
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// ===================================================================
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// HISTORY
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// ------------------------------------------------------------------
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// May 17, 2003: Fixed bug in parseDate() for dates <1970
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// March 11, 2003: Added parseDate() function
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// March 11, 2003: Added "NNN" formatting option. Doesn't match up
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// perfectly with SimpleDateFormat formats, but
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// backwards-compatability was required.
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// ------------------------------------------------------------------
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// These functions use the same 'format' strings as the
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// java.text.SimpleDateFormat class, with minor exceptions.
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// The format string consists of the following abbreviations:
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//
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// Field | Full Form | Short Form
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// -------------+--------------------+-----------------------
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// Year | yyyy (4 digits) | yy (2 digits), y (2 or 4 digits)
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// Month | MMM (name or abbr.)| MM (2 digits), M (1 or 2 digits)
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// | NNN (abbr.) |
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// Day of Month | dd (2 digits) | d (1 or 2 digits)
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// Day of Week | EE (name) | E (abbr)
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// Hour (1-12) | hh (2 digits) | h (1 or 2 digits)
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// Hour (0-23) | HH (2 digits) | H (1 or 2 digits)
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// Hour (0-11) | KK (2 digits) | K (1 or 2 digits)
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// Hour (1-24) | kk (2 digits) | k (1 or 2 digits)
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// Minute | mm (2 digits) | m (1 or 2 digits)
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// Second | ss (2 digits) | s (1 or 2 digits)
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// AM/PM | a |
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//
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// NOTE THE DIFFERENCE BETWEEN MM and mm! Month=MM, not mm!
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// Examples:
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// "MMM d, y" matches: January 01, 2000
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// Dec 1, 1900
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// Nov 20, 00
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// "M/d/yy" matches: 01/20/00
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// 9/2/00
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// "MMM dd, yyyy hh:mm:ssa" matches: "January 01, 2000 12:30:45AM"
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// ------------------------------------------------------------------
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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');
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var DAY_NAMES=new Array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sun','Mon','Tue','Wed','Thu','Fri','Sat');
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function LZ(x) {return(x<0||x>9?"":"0")+x}
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// ------------------------------------------------------------------
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// isDate ( date_string, format_string )
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// Returns true if date string matches format of format string and
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// is a valid date. Else returns false.
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// It is recommended that you trim whitespace around the value before
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// passing it to this function, as whitespace is NOT ignored!
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// ------------------------------------------------------------------
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function isDate(val,format) {
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var date=getDateFromFormat(val,format);
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if (date==0) { return false; }
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return true;
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}
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// -------------------------------------------------------------------
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// compareDates(date1,date1format,date2,date2format)
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// Compare two date strings to see which is greater.
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// Returns:
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// 1 if date1 is greater than date2
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// 0 if date2 is greater than date1 of if they are the same
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// -1 if either of the dates is in an invalid format
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// -------------------------------------------------------------------
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function compareDates(date1,dateformat1,date2,dateformat2) {
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var d1=getDateFromFormat(date1,dateformat1);
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var d2=getDateFromFormat(date2,dateformat2);
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if (d1==0 || d2==0) {
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return -1;
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}
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else if (d1 > d2) {
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return 1;
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}
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return 0;
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}
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// ------------------------------------------------------------------
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// formatDate (date_object, format)
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// Returns a date in the output format specified.
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// The format string uses the same abbreviations as in getDateFromFormat()
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// ------------------------------------------------------------------
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function formatDate(date,format) {
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format=format+"";
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var result="";
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var i_format=0;
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var c="";
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var token="";
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var y=date.getYear()+"";
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var M=date.getMonth()+1;
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var d=date.getDate();
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var E=date.getDay();
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var H=date.getHours();
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var m=date.getMinutes();
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var s=date.getSeconds();
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var yyyy,yy,MMM,MM,dd,hh,h,mm,ss,ampm,HH,H,KK,K,kk,k;
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// Convert real date parts into formatted versions
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var value=new Object();
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if (y.length < 4) {y=""+(y-0+1900);}
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value["y"]=""+y;
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value["yyyy"]=y;
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value["yy"]=y.substring(2,4);
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value["M"]=M;
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value["MM"]=LZ(M);
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value["MMM"]=MONTH_NAMES[M-1];
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value["NNN"]=MONTH_NAMES[M+11];
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value["d"]=d;
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value["dd"]=LZ(d);
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value["E"]=DAY_NAMES[E+7];
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value["EE"]=DAY_NAMES[E];
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value["H"]=H;
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value["HH"]=LZ(H);
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if (H==0){value["h"]=12;}
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else if (H>12){value["h"]=H-12;}
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else {value["h"]=H;}
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value["hh"]=LZ(value["h"]);
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if (H>11){value["K"]=H-12;} else {value["K"]=H;}
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value["k"]=H+1;
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value["KK"]=LZ(value["K"]);
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value["kk"]=LZ(value["k"]);
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if (H > 11) { value["a"]="PM"; }
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else { value["a"]="AM"; }
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value["m"]=m;
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value["mm"]=LZ(m);
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value["s"]=s;
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value["ss"]=LZ(s);
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while (i_format < format.length) {
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c=format.charAt(i_format);
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token="";
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while ((format.charAt(i_format)==c) && (i_format < format.length)) {
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token += format.charAt(i_format++);
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}
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if (value[token] != null) { result=result + value[token]; }
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else { result=result + token; }
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}
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return result;
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}
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// ------------------------------------------------------------------
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// Utility functions for parsing in getDateFromFormat()
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// ------------------------------------------------------------------
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function _isInteger(val) {
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var digits="1234567890";
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for (var i=0; i < val.length; i++) {
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if (digits.indexOf(val.charAt(i))==-1) { return false; }
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}
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return true;
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}
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function _getInt(str,i,minlength,maxlength) {
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for (var x=maxlength; x>=minlength; x--) {
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var token=str.substring(i,i+x);
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if (token.length < minlength) { return null; }
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if (_isInteger(token)) { return token; }
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}
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return null;
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}
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// ------------------------------------------------------------------
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// getDateFromFormat( date_string , format_string )
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//
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// This function takes a date string and a format string. It matches
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// If the date string matches the format string, it returns the
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// getTime() of the date. If it does not match, it returns 0.
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// ------------------------------------------------------------------
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function getDateFromFormat(val,format) {
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val=val+"";
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format=format+"";
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var i_val=0;
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var i_format=0;
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var c="";
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var token="";
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var token2="";
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var x,y;
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var now=new Date();
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var year=now.getYear();
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var month=now.getMonth()+1;
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var date=1;
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var hh=now.getHours();
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var mm=now.getMinutes();
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var ss=now.getSeconds();
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var ampm="";
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while (i_format < format.length) {
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// Get next token from format string
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c=format.charAt(i_format);
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token="";
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while ((format.charAt(i_format)==c) && (i_format < format.length)) {
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token += format.charAt(i_format++);
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}
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// Extract contents of value based on format token
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if (token=="yyyy" || token=="yy" || token=="y") {
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if (token=="yyyy") { x=4;y=4; }
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if (token=="yy") { x=2;y=2; }
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if (token=="y") { x=2;y=4; }
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year=_getInt(val,i_val,x,y);
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if (year==null) { return 0; }
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i_val += year.length;
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if (year.length==2) {
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if (year > 70) { year=1900+(year-0); }
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else { year=2000+(year-0); }
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}
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}
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else if (token=="MMM"||token=="NNN"){
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month=0;
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for (var i=0; i<MONTH_NAMES.length; i++) {
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var month_name=MONTH_NAMES[i];
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if (val.substring(i_val,i_val+month_name.length).toLowerCase()==month_name.toLowerCase()) {
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if (token=="MMM"||(token=="NNN"&&i>11)) {
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month=i+1;
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if (month>12) { month -= 12; }
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i_val += month_name.length;
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break;
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}
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}
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}
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if ((month < 1)||(month>12)){return 0;}
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}
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else if (token=="EE"||token=="E"){
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for (var i=0; i<DAY_NAMES.length; i++) {
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var day_name=DAY_NAMES[i];
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if (val.substring(i_val,i_val+day_name.length).toLowerCase()==day_name.toLowerCase()) {
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i_val += day_name.length;
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break;
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}
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}
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}
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else if (token=="MM"||token=="M") {
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month=_getInt(val,i_val,token.length,2);
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if(month==null||(month<1)||(month>12)){return 0;}
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i_val+=month.length;}
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else if (token=="dd"||token=="d") {
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date=_getInt(val,i_val,token.length,2);
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if(date==null||(date<1)||(date>31)){return 0;}
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i_val+=date.length;}
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else if (token=="hh"||token=="h") {
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hh=_getInt(val,i_val,token.length,2);
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if(hh==null||(hh<1)||(hh>12)){return 0;}
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i_val+=hh.length;}
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else if (token=="HH"||token=="H") {
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hh=_getInt(val,i_val,token.length,2);
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if(hh==null||(hh<0)||(hh>23)){return 0;}
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i_val+=hh.length;}
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else if (token=="KK"||token=="K") {
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hh=_getInt(val,i_val,token.length,2);
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if(hh==null||(hh<0)||(hh>11)){return 0;}
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i_val+=hh.length;}
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else if (token=="kk"||token=="k") {
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hh=_getInt(val,i_val,token.length,2);
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if(hh==null||(hh<1)||(hh>24)){return 0;}
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i_val+=hh.length;hh--;}
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else if (token=="mm"||token=="m") {
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mm=_getInt(val,i_val,token.length,2);
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if(mm==null||(mm<0)||(mm>59)){return 0;}
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i_val+=mm.length;}
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else if (token=="ss"||token=="s") {
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ss=_getInt(val,i_val,token.length,2);
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if(ss==null||(ss<0)||(ss>59)){return 0;}
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i_val+=ss.length;}
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else if (token=="a") {
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if (val.substring(i_val,i_val+2).toLowerCase()=="am") {ampm="AM";}
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else if (val.substring(i_val,i_val+2).toLowerCase()=="pm") {ampm="PM";}
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else {return 0;}
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i_val+=2;}
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else {
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if (val.substring(i_val,i_val+token.length)!=token) {return 0;}
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else {i_val+=token.length;}
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}
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}
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// If there are any trailing characters left in the value, it doesn't match
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if (i_val != val.length) { return 0; }
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// Is date valid for month?
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if (month==2) {
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// Check for leap year
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if ( ( (year%4==0)&&(year%100 != 0) ) || (year%400==0) ) { // leap year
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if (date > 29){ return 0; }
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}
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else { if (date > 28) { return 0; } }
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}
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if ((month==4)||(month==6)||(month==9)||(month==11)) {
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if (date > 30) { return 0; }
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}
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// Correct hours value
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if (hh<12 && ampm=="PM") { hh=hh-0+12; }
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else if (hh>11 && ampm=="AM") { hh-=12; }
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var newdate=new Date(year,month-1,date,hh,mm,ss);
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return newdate.getTime();
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}
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// ------------------------------------------------------------------
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// parseDate( date_string [, prefer_euro_format] )
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//
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// This function takes a date string and tries to match it to a
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// number of possible date formats to get the value. It will try to
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// match against the following international formats, in this order:
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// y-M-d MMM d, y MMM d,y y-MMM-d d-MMM-y MMM d
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// M/d/y M-d-y M.d.y MMM-d M/d M-d
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// d/M/y d-M-y d.M.y d-MMM d/M d-M
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// A second argument may be passed to instruct the method to search
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// for formats like d/M/y (european format) before M/d/y (American).
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// Returns a Date object or null if no patterns match.
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// ------------------------------------------------------------------
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function parseDate(val) {
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var preferEuro=(arguments.length==2)?arguments[1]:false;
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generalFormats=new Array('y-M-d','MMM d, y','MMM d,y','y-MMM-d','d-MMM-y','MMM d');
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monthFirst=new Array('M/d/y','M-d-y','M.d.y','MMM-d','M/d','M-d');
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dateFirst =new Array('d/M/y','d-M-y','d.M.y','d-MMM','d/M','d-M');
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var checkList=new Array('generalFormats',preferEuro?'dateFirst':'monthFirst',preferEuro?'monthFirst':'dateFirst');
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var d=null;
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for (var i=0; i<checkList.length; i++) {
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var l=window[checkList[i]];
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for (var j=0; j<l.length; j++) {
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d=getDateFromFormat(val,l[j]);
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if (d!=0) { return new Date(d); }
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}
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}
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return null;
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}
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