//
===================================================================
// Author: Vipin K R
// WWW:
http://www.careeritdevelopers.blogspot.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 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"]=LZ(M);
value["MMM"]=MONTH_NAMES[M-1];
value["NNN"]=MONTH_NAMES[M+11];
value["d"]=d;
value["dd"]=LZ(d);
value["E"]=DAY_NAMES[E+7];
value["EE"]=DAY_NAMES[E];
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[token] != null) {
result=result + value[token]; }
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
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=_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[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 <>12)){return
0;}
}
else if
(token=="EE"||token=="E"){
for (var i=0;
i<DAY_NAMES.length; i++) {
var
day_name=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=_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 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.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-y MMM 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[1]: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[checkList[i]];
for (var j=0; j<l.length;
j++) {
d=getDateFromFormat(val,l[j]);
if (d!=0) { return new
Date(d); }
}
}
return null;
}
