diff --git a/core/modules/filters/listops.js b/core/modules/filters/listops.js
index d7a07b62a..0c30c22e7 100644
--- a/core/modules/filters/listops.js
+++ b/core/modules/filters/listops.js
@@ -24,7 +24,7 @@ exports.order = function(source,operator,options) {
 	} else {
 		source(function(tiddler,title) {
 			results.push(title);
-		});		
+		});
 	}
 	return results;
 };
@@ -44,7 +44,7 @@ exports.reverse = function(source,operator,options) {
 First entry/entries in list
 */
 exports.first = function(source,operator,options) {
-	var count = parseInt(operator.operand) || 1,
+	var count = $tw.utils.getInt(operator.operand,1),
 		results = [];
 	source(function(tiddler,title) {
 		results.push(title);
@@ -56,7 +56,7 @@ exports.first = function(source,operator,options) {
 Last entry/entries in list
 */
 exports.last = function(source,operator,options) {
-	var count = parseInt(operator.operand) || 1,
+	var count = $tw.utils.getInt(operator.operand,1),
 		results = [];
 	source(function(tiddler,title) {
 		results.push(title);
@@ -68,7 +68,7 @@ exports.last = function(source,operator,options) {
 All but the first entry/entries of the list
 */
 exports.rest = function(source,operator,options) {
-	var count = parseInt(operator.operand) || 1,
+	var count = $tw.utils.getInt(operator.operand,1),
 		results = [];
 	source(function(tiddler,title) {
 		results.push(title);
@@ -82,7 +82,7 @@ exports.bf = exports.rest;
 All but the last entry/entries of the list
 */
 exports.butlast = function(source,operator,options) {
-	var count = parseInt(operator.operand) || 1,
+	var count = $tw.utils.getInt(operator.operand,1),
 		results = [];
 	source(function(tiddler,title) {
 		results.push(title);
@@ -95,7 +95,7 @@ exports.bl = exports.butlast;
 The nth member of the list
 */
 exports.nth = function(source,operator,options) {
-	var count = parseInt(operator.operand) || 1,
+	var count = $tw.utils.getInt(operator.operand,1),
 		results = [];
 	source(function(tiddler,title) {
 		results.push(title);
diff --git a/core/modules/filters/x-listops.js b/core/modules/filters/x-listops.js
index d9c7b83e6..e742e3430 100644
--- a/core/modules/filters/x-listops.js
+++ b/core/modules/filters/x-listops.js
@@ -29,7 +29,7 @@ Extended filter operators to manipulate the current list.
     exports.putbefore = function (source, operator) {
         var results = prepare_results(source),
             index = results.indexOf(operator.operand),
-            count = parseInt(operator.suffix) || 1;
+            count = $tw.utils.getInt(operator.suffix,1);
         return (index === -1) ?
             results.slice(0, -1) :
             results.slice(0, index).concat(results.slice(-count)).concat(results.slice(index, -count));
@@ -41,7 +41,7 @@ Extended filter operators to manipulate the current list.
     exports.putafter = function (source, operator) {
         var results = prepare_results(source),
             index = results.indexOf(operator.operand),
-            count = parseInt(operator.suffix) || 1;
+            count = $tw.utils.getInt(operator.suffix,1);
         return (index === -1) ?
             results.slice(0, -1) :
             results.slice(0, index + 1).concat(results.slice(-count)).concat(results.slice(index + 1, -count));
@@ -53,7 +53,7 @@ Extended filter operators to manipulate the current list.
     exports.replace = function (source, operator) {
         var results = prepare_results(source),
             index = results.indexOf(operator.operand),
-            count = parseInt(operator.suffix) || 1;
+            count = $tw.utils.getInt(operator.suffix,1);
         return (index === -1) ?
             results.slice(0, -count) :
             results.slice(0, index).concat(results.slice(-count)).concat(results.slice(index + 1, -count));
@@ -64,7 +64,7 @@ Extended filter operators to manipulate the current list.
     */
     exports.putfirst = function (source, operator) {
         var results = prepare_results(source),
-            count = parseInt(operator.suffix) || 1;
+            count = $tw.utils.getInt(operator.suffix,1);
         return results.slice(-count).concat(results.slice(0, -count));
     };
 
@@ -73,7 +73,7 @@ Extended filter operators to manipulate the current list.
     */
     exports.putlast = function (source, operator) {
         var results = prepare_results(source),
-            count = parseInt(operator.suffix) || 1;
+            count = $tw.utils.getInt(operator.suffix,1);
         return results.slice(count).concat(results.slice(0, count));
     };
 
@@ -83,7 +83,7 @@ Extended filter operators to manipulate the current list.
     exports.move = function (source, operator) {
         var results = prepare_results(source),
             index = results.indexOf(operator.operand),
-            count = parseInt(operator.suffix) || 1,
+            count = $tw.utils.getInt(operator.suffix,1),
             marker = results.splice(index, 1),
             offset =  (index + count) > 0 ? index + count : 0;
         return results.slice(0, offset).concat(marker).concat(results.slice(offset));
@@ -129,7 +129,7 @@ Extended filter operators to manipulate the current list.
     exports.prepend = function (source, operator) {
         var prepend = $tw.utils.parseStringArray(operator.operand, "true"),
             results = prepare_results(source),
-            count = parseInt(operator.suffix) || prepend.length;
+            count = $tw.utils.getInt(operator.suffix,prepend.length);
         return (prepend.length === 0) ? results :
             (operator.prefix) ? prepend.slice(-count).concat(results) :
             prepend.slice(0, count).concat(results);
diff --git a/core/modules/utils/utils.js b/core/modules/utils/utils.js
index a52f0cbf3..391cdd961 100644
--- a/core/modules/utils/utils.js
+++ b/core/modules/utils/utils.js
@@ -51,6 +51,15 @@ exports.warning = function(text) {
 	exports.log(text,"brown/orange");
 };
 
+/*
+Return the integer represented by the str (string).
+Return the dflt (default) parameter if str is not a base-10 number.
+*/
+exports.getInt = function(str,deflt) {
+	var i = parseInt(str,10);
+	return isNaN(i) ? deflt : i;
+}
+
 /*
 Repeatedly replaces a substring within a string. Like String.prototype.replace, but without any of the default special handling of $ sequences in the replace string
 */
@@ -363,15 +372,15 @@ exports.formatDateString = function(date,template) {
 			}]
 		];
 	// If the user wants everything in UTC, shift the datestamp
-	// Optimize for format string that essentially means 
+	// Optimize for format string that essentially means
 	// 'return raw UTC (tiddlywiki style) date string.'
 	if(t.indexOf("[UTC]") == 0 ) {
-		if(t == "[UTC]YYYY0MM0DD0hh0mm0ssXXX") 
+		if(t == "[UTC]YYYY0MM0DD0hh0mm0ssXXX")
 			return $tw.utils.stringifyDate(new Date());
 		var offset = date.getTimezoneOffset() ; // in minutes
 		date = new Date(date.getTime()+offset*60*1000) ;
 		t = t.substr(5) ;
-	} 
+	}
 	while(t.length){
 		var matchString = "";
 		$tw.utils.each(matches, function(m) {
@@ -491,7 +500,7 @@ exports.entityDecode = function(s) {
 		e = s.substr(1,s.length-2); // Strip the & and the ;
 	if(e.charAt(0) === "#") {
 		if(e.charAt(1) === "x" || e.charAt(1) === "X") {
-			return converter(parseInt(e.substr(2),16));	
+			return converter(parseInt(e.substr(2),16));
 		} else {
 			return converter(parseInt(e.substr(1),10));
 		}
@@ -724,7 +733,7 @@ High resolution microsecond timer for profiling
 exports.timer = function(base) {
 	var m;
 	if($tw.node) {
-		var r = process.hrtime();		
+		var r = process.hrtime();
 		m =  r[0] * 1e3 + (r[1] / 1e6);
 	} else if(window.performance) {
 		m = performance.now();