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   1  // ===================================================================
   2  // Author: Matt Kruse <matt@mattkruse.com>
   3  // WWW: http://www.mattkruse.com/
   4  //
   5  // NOTICE: You may use this code for any purpose, commercial or
   6  // private, without any further permission from the author. You may
   7  // remove this notice from your final code if you wish, however it is
   8  // appreciated by the author if at least my web site address is kept.
   9  //
  10  // You may *NOT* re-distribute this code in any way except through its
  11  // use. That means, you can include it in your product, or your web
  12  // site, or any other form where the code is actually being used. You
  13  // may not put the plain javascript up on your site for download or
  14  // include it in your javascript libraries for download. 
  15  // If you wish to share this code with others, please just point them
  16  // to the URL instead.
  17  // Please DO NOT link directly to my .js files from your site. Copy
  18  // the files to your server and use them there. Thank you.
  19  // ===================================================================
  20  
  21  // HISTORY
  22  // ------------------------------------------------------------------
  23  // May 17, 2003: Fixed bug in parseDate() for dates <1970
  24  // March 11, 2003: Added parseDate() function
  25  // March 11, 2003: Added "NNN" formatting option. Doesn't match up
  26  //                 perfectly with SimpleDateFormat formats, but 
  27  //                 backwards-compatability was required.
  28  
  29  // ------------------------------------------------------------------
  30  // These functions use the same 'format' strings as the 
  31  // java.text.SimpleDateFormat class, with minor exceptions.
  32  // The format string consists of the following abbreviations:
  33  // 
  34  // Field        | Full Form          | Short Form
  35  // -------------+--------------------+-----------------------
  36  // Year         | yyyy (4 digits)    | yy (2 digits), y (2 or 4 digits)
  37  // Month        | MMM (name or abbr.)| MM (2 digits), M (1 or 2 digits)
  38  //              | NNN (abbr.)        |
  39  // Day of Month | dd (2 digits)      | d (1 or 2 digits)
  40  // Day of Week  | EE (name)          | E (abbr)
  41  // Hour (1-12)  | hh (2 digits)      | h (1 or 2 digits)
  42  // Hour (0-23)  | HH (2 digits)      | H (1 or 2 digits)
  43  // Hour (0-11)  | KK (2 digits)      | K (1 or 2 digits)
  44  // Hour (1-24)  | kk (2 digits)      | k (1 or 2 digits)
  45  // Minute       | mm (2 digits)      | m (1 or 2 digits)
  46  // Second       | ss (2 digits)      | s (1 or 2 digits)
  47  // AM/PM        | a                  |
  48  //
  49  // NOTE THE DIFFERENCE BETWEEN MM and mm! Month=MM, not mm!
  50  // Examples:
  51  //  "MMM d, y" matches: January 01, 2000
  52  //                      Dec 1, 1900
  53  //                      Nov 20, 00
  54  //  "M/d/yy"   matches: 01/20/00
  55  //                      9/2/00
  56  //  "MMM dd, yyyy hh:mm:ssa" matches: "January 01, 2000 12:30:45AM"
  57  // ------------------------------------------------------------------
  58  
  59  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');
  60  var DAY_NAMES=new Array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sun','Mon','Tue','Wed','Thu','Fri','Sat');
  61  function LZ(x) {return(x<0||x>9?"":"0")+x}
  62  
  63  // ------------------------------------------------------------------
  64  // isDate ( date_string, format_string )
  65  // Returns true if date string matches format of format string and
  66  // is a valid date. Else returns false.
  67  // It is recommended that you trim whitespace around the value before
  68  // passing it to this function, as whitespace is NOT ignored!
  69  // ------------------------------------------------------------------
  70  function isDate(val,format) {
  71      var date=getDateFromFormat(val,format);
  72      if (date==0) { return false; }
  73      return true;
  74      }
  75  
  76  // -------------------------------------------------------------------
  77  // compareDates(date1,date1format,date2,date2format)
  78  //   Compare two date strings to see which is greater.
  79  //   Returns:
  80  //   1 if date1 is greater than date2
  81  //   0 if date2 is greater than date1 of if they are the same
  82  //  -1 if either of the dates is in an invalid format
  83  // -------------------------------------------------------------------
  84  function compareDates(date1,dateformat1,date2,dateformat2) {
  85      var d1=getDateFromFormat(date1,dateformat1);
  86      var d2=getDateFromFormat(date2,dateformat2);
  87      if (d1==0 || d2==0) {
  88          return -1;
  89          }
  90      else if (d1 > d2) {
  91          return 1;
  92          }
  93      return 0;
  94      }
  95  
  96  // ------------------------------------------------------------------
  97  // formatDate (date_object, format)
  98  // Returns a date in the output format specified.
  99  // The format string uses the same abbreviations as in getDateFromFormat()
 100  // ------------------------------------------------------------------
 101  function formatDate(date,format) {
 102      format=format+"";
 103      var result="";
 104      var i_format=0;
 105      var c="";
 106      var token="";
 107      var y=date.getYear()+"";
 108      var M=date.getMonth()+1;
 109      var d=date.getDate();
 110      var E=date.getDay();
 111      var H=date.getHours();
 112      var m=date.getMinutes();
 113      var s=date.getSeconds();
 114      var yyyy,yy,MMM,MM,dd,hh,h,mm,ss,ampm,HH,H,KK,K,kk,k;
 115      // Convert real date parts into formatted versions
 116      var value=new Object();
 117      if (y.length < 4) {y=""+(y-0+1900);}
 118      value["y"]=""+y;
 119      value["yyyy"]=y;
 120      value["yy"]=y.substring(2,4);
 121      value["M"]=M;
 122      value["MM"]=LZ(M);
 123      value["MMM"]=MONTH_NAMES[M-1];
 124      value["NNN"]=MONTH_NAMES[M+11];
 125      value["d"]=d;
 126      value["dd"]=LZ(d);
 127      value["E"]=DAY_NAMES[E+7];
 128      value["EE"]=DAY_NAMES[E];
 129      value["H"]=H;
 130      value["HH"]=LZ(H);
 131      if (H==0){value["h"]=12;}
 132      else if (H>12){value["h"]=H-12;}
 133      else {value["h"]=H;}
 134      value["hh"]=LZ(value["h"]);
 135      if (H>11){value["K"]=H-12;} else {value["K"]=H;}
 136      value["k"]=H+1;
 137      value["KK"]=LZ(value["K"]);
 138      value["kk"]=LZ(value["k"]);
 139      if (H > 11) { value["a"]="PM"; }
 140      else { value["a"]="AM"; }
 141      value["m"]=m;
 142      value["mm"]=LZ(m);
 143      value["s"]=s;
 144      value["ss"]=LZ(s);
 145      while (i_format < format.length) {
 146          c=format.charAt(i_format);
 147          token="";
 148          while ((format.charAt(i_format)==c) && (i_format < format.length)) {
 149              token += format.charAt(i_format++);
 150              }
 151          if (value[token] != null) { result=result + value[token]; }
 152          else { result=result + token; }
 153          }
 154      return result;
 155      }
 156      
 157  // ------------------------------------------------------------------
 158  // Utility functions for parsing in getDateFromFormat()
 159  // ------------------------------------------------------------------
 160  function _isInteger(val) {
 161      var digits="1234567890";
 162      for (var i=0; i < val.length; i++) {
 163          if (digits.indexOf(val.charAt(i))==-1) { return false; }
 164          }
 165      return true;
 166      }
 167  function _getInt(str,i,minlength,maxlength) {
 168      for (var x=maxlength; x>=minlength; x--) {
 169          var token=str.substring(i,i+x);
 170          if (token.length < minlength) { return null; }
 171          if (_isInteger(token)) { return token; }
 172          }
 173      return null;
 174      }
 175      
 176  // ------------------------------------------------------------------
 177  // getDateFromFormat( date_string , format_string )
 178  //
 179  // This function takes a date string and a format string. It matches
 180  // If the date string matches the format string, it returns the 
 181  // getTime() of the date. If it does not match, it returns 0.
 182  // ------------------------------------------------------------------
 183  function getDateFromFormat(val,format) {
 184      val=val+"";
 185      format=format+"";
 186      var i_val=0;
 187      var i_format=0;
 188      var c="";
 189      var token="";
 190      var token2="";
 191      var x,y;
 192      var now=new Date();
 193      var year=now.getYear();
 194      var month=now.getMonth()+1;
 195      var date=1;
 196      var hh=now.getHours();
 197      var mm=now.getMinutes();
 198      var ss=now.getSeconds();
 199      var ampm="";
 200      
 201      while (i_format < format.length) {
 202          // Get next token from format string
 203          c=format.charAt(i_format);
 204          token="";
 205          while ((format.charAt(i_format)==c) && (i_format < format.length)) {
 206              token += format.charAt(i_format++);
 207              }
 208          // Extract contents of value based on format token
 209          if (token=="yyyy" || token=="yy" || token=="y") {
 210              if (token=="yyyy") { x=4;y=4; }
 211              if (token=="yy")   { x=2;y=2; }
 212              if (token=="y")    { x=2;y=4; }
 213              year=_getInt(val,i_val,x,y);
 214              if (year==null) { return 0; }
 215              i_val += year.length;
 216              if (year.length==2) {
 217                  if (year > 70) { year=1900+(year-0); }
 218                  else { year=2000+(year-0); }
 219                  }
 220              }
 221          else if (token=="MMM"||token=="NNN"){
 222              month=0;
 223              for (var i=0; i<MONTH_NAMES.length; i++) {
 224                  var month_name=MONTH_NAMES[i];
 225                  if (val.substring(i_val,i_val+month_name.length).toLowerCase()==month_name.toLowerCase()) {
 226                      if (token=="MMM"||(token=="NNN"&&i>11)) {
 227                          month=i+1;
 228                          if (month>12) { month -= 12; }
 229                          i_val += month_name.length;
 230                          break;
 231                          }
 232                      }
 233                  }
 234              if ((month < 1)||(month>12)){return 0;}
 235              }
 236          else if (token=="EE"||token=="E"){
 237              for (var i=0; i<DAY_NAMES.length; i++) {
 238                  var day_name=DAY_NAMES[i];
 239                  if (val.substring(i_val,i_val+day_name.length).toLowerCase()==day_name.toLowerCase()) {
 240                      i_val += day_name.length;
 241                      break;
 242                      }
 243                  }
 244              }
 245          else if (token=="MM"||token=="M") {
 246              month=_getInt(val,i_val,token.length,2);
 247              if(month==null||(month<1)||(month>12)){return 0;}
 248              i_val+=month.length;}
 249          else if (token=="dd"||token=="d") {
 250              date=_getInt(val,i_val,token.length,2);
 251              if(date==null||(date<1)||(date>31)){return 0;}
 252              i_val+=date.length;}
 253          else if (token=="hh"||token=="h") {
 254              hh=_getInt(val,i_val,token.length,2);
 255              if(hh==null||(hh<1)||(hh>12)){return 0;}
 256              i_val+=hh.length;}
 257          else if (token=="HH"||token=="H") {
 258              hh=_getInt(val,i_val,token.length,2);
 259              if(hh==null||(hh<0)||(hh>23)){return 0;}
 260              i_val+=hh.length;}
 261          else if (token=="KK"||token=="K") {
 262              hh=_getInt(val,i_val,token.length,2);
 263              if(hh==null||(hh<0)||(hh>11)){return 0;}
 264              i_val+=hh.length;}
 265          else if (token=="kk"||token=="k") {
 266              hh=_getInt(val,i_val,token.length,2);
 267              if(hh==null||(hh<1)||(hh>24)){return 0;}
 268              i_val+=hh.length;hh--;}
 269          else if (token=="mm"||token=="m") {
 270              mm=_getInt(val,i_val,token.length,2);
 271              if(mm==null||(mm<0)||(mm>59)){return 0;}
 272              i_val+=mm.length;}
 273          else if (token=="ss"||token=="s") {
 274              ss=_getInt(val,i_val,token.length,2);
 275              if(ss==null||(ss<0)||(ss>59)){return 0;}
 276              i_val+=ss.length;}
 277          else if (token=="a") {
 278              if (val.substring(i_val,i_val+2).toLowerCase()=="am") {ampm="AM";}
 279              else if (val.substring(i_val,i_val+2).toLowerCase()=="pm") {ampm="PM";}
 280              else {return 0;}
 281              i_val+=2;}
 282          else {
 283              if (val.substring(i_val,i_val+token.length)!=token) {return 0;}
 284              else {i_val+=token.length;}
 285              }
 286          }
 287      // If there are any trailing characters left in the value, it doesn't match
 288      if (i_val != val.length) { return 0; }
 289      // Is date valid for month?
 290      if (month==2) {
 291          // Check for leap year
 292          if ( ( (year%4==0)&&(year%100 != 0) ) || (year%400==0) ) { // leap year
 293              if (date > 29){ return 0; }
 294              }
 295          else { if (date > 28) { return 0; } }
 296          }
 297      if ((month==4)||(month==6)||(month==9)||(month==11)) {
 298          if (date > 30) { return 0; }
 299          }
 300      // Correct hours value
 301      if (hh<12 && ampm=="PM") { hh=hh-0+12; }
 302      else if (hh>11 && ampm=="AM") { hh-=12; }
 303      var newdate=new Date(year,month-1,date,hh,mm,ss);
 304      return newdate.getTime();
 305      }
 306  
 307  // ------------------------------------------------------------------
 308  // parseDate( date_string [, prefer_euro_format] )
 309  //
 310  // This function takes a date string and tries to match it to a
 311  // number of possible date formats to get the value. It will try to
 312  // match against the following international formats, in this order:
 313  // y-M-d   MMM d, y   MMM d,y   y-MMM-d   d-MMM-y  MMM d
 314  // 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      }