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| /**
* formatDate()
* - follows Java SimpleDateFormat pattern conventions but does not support time zones
* - depends on dateLanguage object
*
* @param dDate a javascript date object
* @param patternStr a Java-style date format string
* @return string representation of the date
*/
function formatDate(dDate, patternStr) {
/* interior functions */
//countTokenLength() counts the number of repetitions of the individual date format token appearing next in the string
function countTokenLength(str) {
var re = /^([a-zA-Z])(1){0,100}/g;
var matchStr = str.match(re);
if (!matchStr) {
return 1;
}
return matchStr[0].length;
}
//padResult() adds copies of padStr to num until it is as wide as necessary
//in retrospect, this could be made much shorter and more efficient
function padResult(num, width, padStr) { //dependent function
var returnStr = "";
if (width > 1) {
var padLength = width - num.toString().length;
if (padLength) {
for (i=0; i<padLength; i++) {
returnStr += padStr;
}
}
}
returnStr += num.toString();
return returnStr;
}
//here is where the action begins
var resultStr = "";
var subPatternLength = 0;
while (patternStr.length > 0) {
subPatternLength = countTokenLength(patternStr);
var token = patternStr.substr(0,1);
switch (token) {
case "G":
resultStr += (dDate.getFullYear() >=0) ? dateLanguage.eraNames[1] : dateLanguage.eraNames[0];
break;
case "y":
var x = dDate.getFullYear().toString();
if (dDate.getFullYear() > 999) {
if (subPatternLength > 2) {
resultStr += x;
}
else {
resultStr += x.substring(x.length - 2, x.length);
}
}
else {
resultStr += x + " " + ((dDate.getFullYear() >=0) ? dateLanguage.eraNames[1] : dateLanguage.eraNames[0]);
}
break;
case "M":
if (subPatternLength > 2) {
resultStr += (subPatternLength == 3) ? dateLanguage.monthNamesShort[dDate.getMonth()] : dateLanguage.monthNames[dDate.getMonth()];
}
else {
resultStr += padResult(dDate.getMonth(), subPatternLength, '0');
}
break;
case "w":
var resultLength = (subPatternLength >= 2) ? 2 : 1;
resultStr += "[week in year]";
break;
case "W":
var resultLength = (subPatternLength >= 2) ? 2 : 1;
resultStr += "[week in month]";
break;
case "D":
var resultLength = (subPatternLength >= 2) ? 2 : 1;
resultStr += "[day in year]";
break;
case "d":
var resultLength = (subPatternLength >= 2) ? 2 : 1;
resultStr += padResult(dDate.getDate(), resultLength, '0');
break;
case "F":
var resultLength = (subPatternLength >= 2) ? 2 : 1;
resultStr += "[day of week in month]";
break;
case "E":
switch (subPatternLength) {
case 1:
resultStr += dateLanguage.weekDayNamesAbbrev[dDate.getDay()];
break;
case 2:
resultStr += dateLanguage.weekDayNamesTiny[dDate.getDay()];
break;
case 3:
resultStr += dateLanguage.weekDayNamesShort[dDate.getDay()];
break;
default:
resultStr += dateLanguage.weekDayNames[dDate.getDay()];
break;
}
break;
case "a":
resultStr += (dDate.getHours() < 12) ? dateLanguage.amPmNames[0] : dateLanguage.amPmNames[1];
break;
case "H":
var resultLength = (subPatternLength >= 2) ? 2 : 1;
resultStr += padResult(dDate.getHours(), resultLength, '0');
break;
case "k":
var resultLength = (subPatternLength >= 2) ? 2 : 1;
if (dDate.getHours() == 0) resultStr += "24";
else resultStr +=padResult(dDate.getHours(), resultLength, '0');
break;
case "K":
var resultLength = (subPatternLength >= 2) ? 2 : 1;
var adjust = (dDate.getHours() >= 12) ? -12 : 0;
resultStr += padResult((dDate.getHours() + adjust), resultLength, '0');
break;
case "h":
var resultLength = (subPatternLength >= 2) ? 2 : 1;
var adjust = (dDate.getHours() >= 12) ? -12 : 0;
if ((dDate.getHours() + adjust) == 0) {
resultStr += "12";
}
else {
resultStr += padResult((dDate.getHours() + adjust), resultLength, '0');
}
break;
case "m":
var resultLength = (subPatternLength >= 2) ? 2 : 1;
resultStr += padResult(dDate.getMinutes(), resultLength, '0');
break;
case "s":
var resultLength = (subPatternLength >= 2) ? 2 : 1;
resultStr += padResult(dDate.getSeconds(), resultLength, '0');
break;
case "S":
resultStr += dDate.getTime();
break;
case "z":
resultStr += "[general time zone]";
break;
case "Z":
resultStr += "[rfc 822 time zone]";
break;
case "'":
if (patternStr.substr(1,1) == "'") {
resultStr += "'";
subPatternLength = 2;
}
else {
var txt = patternStr.match(/^'([^']|'')*'/g)[0];
subPatternLength = txt.length;
var strippedTxt = txt.substring(1, txt.length-1).replace(/''/g, "'");
resultStr += strippedTxt;
}
break;
default:
var alphaRe = new RegExp("[A-Za-z]", "g")
if (!token.match(alphaRe)) {
resultStr += token;
subPatternLength = 1;
}
break;
}
patternStr = patternStr.substring(subPatternLength, patternStr.length);
}
return resultStr;
}
var dateLanguage = {
monthNames : ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
monthNamesShort : ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
weekDayNames : ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
weekDayNamesShort : ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
weekDayNamesTiny : ['Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa'],
weekDayNamesAbbrev : ['S', 'M', 'T', 'W', 'T', 'F', 'S'],
eraNames : ['BC', 'AD'],
amPmNames : ['AM', 'PM']
}; |
