Closes #220, Add a more friendly way to enter dates in search window and accessDate field

Addresss #352, Make sure data layer doesn't allow bad data via the API

Access date field is now human-friendly. Also enforcing SQL date form for the field in the DB and discarding bad data passed via setField().

chrome/content/zotero/itemPane.js

@@ -830,6 +830,11 @@ var ZoteroItemPane = new function()
 				if (valueText){
 					var date = Zotero.Date.sqlToDate(valueText, true);
 					valueText = date ? date.toLocaleString() : '';
+					
+					// Don't show time for access date if none
+					if (fieldName == 'accessDate') {
+						valueText = valueText.replace('00:00:00 ', '');
+					}
 				}
 				break;
 		}
@@ -1241,11 +1246,21 @@ var ZoteroItemPane = new function()
 		// Fields
 		else
 		{
-			// Access date needs to be converted to UTC
+			// Access date needs to be parsed and converted to UTC
 			if (fieldName=='accessDate' && value!='')
 			{
-				var localDate = Zotero.Date.sqlToDate(value);
-				value = Zotero.Date.dateToSQL(localDate, true);
+				if (Zotero.Date.isSQLDate(value) || Zotero.Date.isSQLDateTime(value)) {
+					var localDate = Zotero.Date.sqlToDate(value);
+					value = Zotero.Date.dateToSQL(localDate, true);
+				}
+				else {
+					var d = Zotero.Date.strToDate(value);
+					value = null;
+					if (d.year && d.month != undefined && d.day) {
+						d = new Date(d.year, d.month, d.day);
+						value = Zotero.Date.dateToSQL(d, true);
+					}
+				}
 			}
 			
 			if(saveChanges)

chrome/content/zotero/xpcom/data_access.js

@@ -509,6 +509,15 @@ Zotero.Item.prototype.setField = function(field, value, loadIn){
 					!Zotero.Date.isMultipart(value)){
 				value = Zotero.Date.strToMultipart(value);
 			}
+			
+			if (fieldID == Zotero.ItemFields.getID('accessDate')) {
+				if (!Zotero.Date.isSQLDate(value) &&
+						!Zotero.Date.isSQLDateTime(value)) {
+					Zotero.debug("Discarding invalid accessDate '" + value
+						+ "' in Item.setField()");
+					return false;
+				}
+			}
 		}
 		
 		// If existing value, make sure it's actually changing

chrome/content/zotero/xpcom/schema.js

@@ -771,8 +771,11 @@ Zotero.Schema = new function(){
 		// Firefox 2.0, so we just throw the triggers at the DB on every
 		// userdata update and catch errors individually
 		//
-		// Add in DROP statements if these need to change
-		var itemDataTrigger = "  FOR EACH ROW WHEN NEW.fieldID=14\n"
+		
+		try { Zotero.DB.query("DROP TRIGGER insert_date_field"); } catch (e) {}
+		try { Zotero.DB.query("DROP TRIGGER update_date_field"); } catch (e) {}
+		
+		var itemDataTrigger = "  FOR EACH ROW WHEN NEW.fieldID IN (14, 27)\n"
 			+ "  BEGIN\n"
 			+ "    SELECT CASE\n"
 			+ "        CAST(SUBSTR(NEW.value, 1, 4) AS INT) BETWEEN 0 AND 9999 AND\n"

userdata.sql

@@ -1,4 +1,4 @@
--- 17
+-- 18
 
 -- This file creates tables containing user-specific data -- any changes
 -- to existing tables made here must be mirrored in transition steps in