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// =================================================================== |
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// Author: Matt Kruse <[email protected]> |
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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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View Code Duplication |
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; |
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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 |
315
|
|
|
// d/M/y d-M-y d.M.y d-MMM d/M d-M |
316
|
|
|
// A second argument may be passed to instruct the method to search |
317
|
|
|
// for formats like d/M/y (european format) before M/d/y (American). |
318
|
|
|
// Returns a Date object or null if no patterns match. |
319
|
|
|
// ------------------------------------------------------------------ |
320
|
|
|
function parseDate(val) { |
321
|
|
|
var preferEuro=(arguments.length==2)?arguments[1]:false; |
322
|
|
|
generalFormats=new Array('y-M-d','MMM d, y','MMM d,y','y-MMM-d','d-MMM-y','MMM d'); |
|
|
|
|
323
|
|
|
monthFirst=new Array('M/d/y','M-d-y','M.d.y','MMM-d','M/d','M-d'); |
|
|
|
|
324
|
|
|
dateFirst =new Array('d/M/y','d-M-y','d.M.y','d-MMM','d/M','d-M'); |
|
|
|
|
325
|
|
|
var checkList=new Array('generalFormats',preferEuro?'dateFirst':'monthFirst',preferEuro?'monthFirst':'dateFirst'); |
|
|
|
|
326
|
|
|
var d=null; |
|
|
|
|
327
|
|
|
for (var i=0; i<checkList.length; i++) { |
328
|
|
|
var l=window[checkList[i]]; |
329
|
|
|
for (var j=0; j<l.length; j++) { |
330
|
|
|
d=getDateFromFormat(val,l[j]); |
331
|
|
|
if (d!=0) { return new Date(d); } |
332
|
|
|
} |
333
|
|
|
} |
334
|
|
|
return null; |
335
|
|
|
} |
336
|
|
|
|