Fixes #333, Access date needs special handling in item pane for webpage item type

- Currently requires user to enter dates in SQL format if they want to change the access date, but at least it doesn't mangle the dates anymore

- Uses new function ScholardammitZotero.Date.dateToSQL(Date date [, Boolean toUTC])

- Utilities.lpad() now forces _string_ to a string so that .length exists

- Unrelated: Item.save() now returns false if the item didn't change

chrome/content/zotero/itemPane.js

@@ -207,13 +207,6 @@ var ZoteroItemPane = new function()
 				
 				var val = _itemBeingEdited.getField(fieldNames[i]);
 				
-				// Convert dates from UTC
-				if (fieldNames[i]=='dateAdded' || fieldNames[i]=='dateModified'
-					|| fieldNames[i]=='accessDate'){
-					var date = Zotero.Date.sqlToDate(val, true);
-					val = date ? date.toLocaleString() : '';
-				}
-				
 				// Start tabindex at 1000 after creators
 				var tabindex = editable ? (i>0 ? _tabIndexMinFields + i : 1) : 0;
 				
@@ -652,9 +645,19 @@ var ZoteroItemPane = new function()
 			valueElement.setAttribute('onclick', 'ZoteroItemPane.showEditor(this)');
 			valueElement.className = 'clicky';
 			
-			if (fieldName=='tag')
+			switch (fieldName)
 			{
-				_tabIndexMaxTagsFields = Math.max(_tabIndexMaxTagsFields, tabindex);
+				case 'tag':
+					_tabIndexMaxTagsFields = Math.max(_tabIndexMaxTagsFields, tabindex);
+					break;
+				
+				// Convert dates from UTC
+				case 'dateAdded':
+				case 'dateModified':
+				case 'accessDate':
+					var date = Zotero.Date.sqlToDate(valueText, true);
+					valueText = date ? date.toLocaleString() : '';
+					break;
 			}
 		}
 		
@@ -730,6 +733,13 @@ var ZoteroItemPane = new function()
 		{
 			var value = _itemBeingEdited.getField(fieldName);
 			var itemID = _itemBeingEdited.getID();
+			
+			// Access date needs to be converted from UTC
+			if (fieldName=='accessDate')
+			{
+				var localDate = Zotero.Date.sqlToDate(value, true);
+				var value = Zotero.Date.dateToSQL(localDate);
+			}
 		}
 		
 		var t = document.createElement("textbox");
@@ -988,9 +998,16 @@ var ZoteroItemPane = new function()
 		// Fields
 		else
 		{
+			// Access date needs to be converted to UTC
+			if (fieldName=='accessDate')
+			{
+				var localDate = Zotero.Date.sqlToDate(value);
+				var value = Zotero.Date.dateToSQL(localDate, true);
+			}
+			
 			if(saveChanges)
 				modifyField(fieldName,value);
-		
+			
 			elem = createValueElement(_itemBeingEdited.getField(fieldName), fieldName, tabindex);
 		}
 		
@@ -1011,7 +1028,7 @@ var ZoteroItemPane = new function()
 	function modifyField(field, value)
 	{
 		_itemBeingEdited.setField(field,value);
-		_itemBeingEdited.save();
+		return _itemBeingEdited.save();
 	}
 	
 	function _getFieldValue(field)

chrome/content/zotero/xpcom/data_access.js

@@ -421,7 +421,7 @@ Zotero.Item.prototype.setField = function(field, value, loadIn){
 Zotero.Item.prototype.save = function(){
 	if (!this.hasChanged()){
 		Zotero.debug('Item ' + this.getID() + ' has not changed', 4);
-		return !!this.getID();
+		return false;
 	}
 	
 	//

chrome/content/zotero/xpcom/utilities.js

@@ -134,6 +134,7 @@ Zotero.Utilities.prototype.inArray = Zotero.inArray;
  * pads a number or other string with a given string on the left
  */
 Zotero.Utilities.prototype.lpad = function(string, pad, length) {
+	string = string + '';
 	while(string.length < length) {
 		string = pad + string;
 	}

chrome/content/zotero/xpcom/zotero.js

@@ -632,6 +632,7 @@ Zotero.Hash.prototype.has = function(in_key){
 
 Zotero.Date = new function(){
 	this.sqlToDate = sqlToDate;
+	this.dateToSQL = dateToSQL;
 	this.strToDate = strToDate;
 	this.formatDate = formatDate;
 	this.getFileDateString = getFileDateString;
@@ -672,6 +673,50 @@ Zotero.Date = new function(){
 		}
 	}
 	
+	
+	/**
+	* Convert a JS Date object to an SQL date in the form '2006-06-13 11:03:05'
+	*
+	* If _toUTC_ is true, creates a UTC date
+	**/
+	function dateToSQL(date, toUTC)
+	{
+		try {
+			if (toUTC){
+				var year = date.getUTCFullYear();
+				var month = date.getUTCMonth();
+				var day = date.getUTCDate();
+				var hours = date.getUTCHours();
+				var minutes = date.getUTCMinutes();
+				var seconds = date.getUTCSeconds();
+			}
+			else {
+				var year = date.getFullYear();
+				var month = date.getMonth();
+				var day = date.getDate();
+				var hours = date.getHours();
+				var minutes = date.getMinutes();
+				var seconds = date.getSeconds();
+			}
+			
+			var utils = new Zotero.Utilities();
+			year = utils.lpad(year, '0', 4);
+			month = utils.lpad(month + 1, '0', 2);
+			day = utils.lpad(day, '0', 2);
+			hours = utils.lpad(hours, '0', 2);
+			minutes = utils.lpad(minutes, '0', 2);
+			seconds = utils.lpad(seconds, '0', 2);
+			
+			return year + '-' + month + '-' + day + ' '
+				+ hours + ':' + minutes + ':' + seconds;
+		}
+		catch (e){
+			Zotero.debug(date + ' is not a valid JS date', 2);
+			return '';
+		}
+	}
+	
+	
 	/*
 	 * converts a string to an object containing:
 	 *    day: integer form of the day