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DateFormat = Class.create();
Object.extend(DateFormat, {
MONTH_NAMES: ['January','February','March','April','May','June','July','August','September','October','November','December','Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'],
DAY_NAMES: ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sun','Mon','Tue','Wed','Thu','Fri','Sat'],
LZ: function(x) {return(x<0||x>9?"":"0")+x},
compareDates: function(date1,dateformat1,date2,dateformat2) {
var d1=DateFormat.parseFormat(date1,dateformat1);
var d2=DateFormat.parseFormat(date2,dateformat2);
if (d1==0 || d2==0) return -1;
else if (d1 > d2) return 1;
return 0;
},
format: function(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 versions
var 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"]=DateFormat.LZ(M);
value["MMM"]=DateFormat.MONTH_NAMES[M-1];
value["NNN"]=DateFormat.MONTH_NAMES[M+11];
value["d"]=d;
value["dd"]=DateFormat.LZ(d);
value["E"]=DateFormat.DAY_NAMES[E+7];
value["EE"]=DateFormat.DAY_NAMES[E];
value["H"]=H;
value["HH"]=DateFormat.LZ(H);
if (H==0){value["h"]=12;}
else if (H>12){value["h"]=H-12;}
else {value["h"]=H;}
value["hh"]=DateFormat.LZ(value["h"]);
if (H>11){value["K"]=H-12;} else {value["K"]=H;}
value["k"]=H+1;
value["KK"]=DateFormat.LZ(value["K"]);
value["kk"]=DateFormat.LZ(value["k"]);
if (H > 11) { value["a"]="PM"; }
else { value["a"]="AM"; }
value["m"]=m;
value["mm"]=DateFormat.LZ(m);
value["s"]=s;
value["ss"]=DateFormat.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[token] != null) result += value[token];
else result += token;
}
return result;
},
_isInteger: function(val) {
var digits="1234567890";
for (var i=0; i < val.length; i++)
if (digits.indexOf(val.charAt(i))==-1) return false;
return true;
},
_getInt: function(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 (DateFormat._isInteger(token)) return token;
}
return null;
},
parseFormat: function(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 string
c=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 token
if (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=DateFormat._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<DateFormat.MONTH_NAMES.length; i++) {
var month_name=DateFormat.MONTH_NAMES[i];
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<DateFormat.DAY_NAMES.length; i++) {
var day_name=DateFormat.DAY_NAMES[i];
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=DateFormat._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=DateFormat._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=DateFormat._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=DateFormat._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=DateFormat._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=DateFormat._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=DateFormat._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=DateFormat._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 match
if (i_val != val.length) return 0;
// Is date valid for month?
if (month==2) {
// Check for leap year
if (((year%4==0)&&(year%100 != 0)) || (year%400==0)) { // leap year
if (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 value
if (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;
},
parse: function(val, format) {
if (format) {
return DateFormat.parseFormat(val, format);
} else {
var preferEuro=(arguments.length==2)?arguments[1]:false;
var generalFormats=new Array('y-M-d','MMM d, y','MMM d,y','y-MMM-d','d-MMM-y','MMM d');
var monthFirst=new Array('M/d/y','M-d-y','M.d.y','MMM-d','M/d','M-d');
var dateFirst =new Array('d/M/y','d-M-y','d.M.y','d-MMM','d/M','d-M');
var checkList=[generalFormats,preferEuro?dateFirst:monthFirst,preferEuro?monthFirst:dateFirst];
var d=null;
for (var i=0; i<checkList.length; i++) {
var l=checkList[i];
for (var j=0; j<l.length; j++) {
d=DateFormat.parseFormat(val,l[j]);
if (d!=0) return new Date(d);
}
}
return null;
}
}
});
DateFormat.prototype = {
initialize: function(format) { this.format = format; },
parse: function(value) { return DateFormat.parseFormat(value, this.format); },
format: function(value) { return DateFormat.format(value, this.format); }
}
Date.prototype.format = function(format) {
return DateFormat.format(this, format);
}
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