diff --git a/boot/boot.js b/boot/boot.js
index 76eeb4be3..78906fb8f 100644
--- a/boot/boot.js
+++ b/boot/boot.js
@@ -51,6 +51,63 @@ $tw.utils.isArray = function(value) {
 	return Object.prototype.toString.call(value) == "[object Array]";
 };
 
+/*
+Check if an array is equal by value and by reference.
+*/
+$tw.utils.isArrayEqual = function(array1,array2) {
+	if(array1 === array2) {
+		return true;
+	}
+	array1 = array1 || [];
+	array2 = array2 || [];
+	if(array1.length !== array2.length) {
+		return false;
+	}
+	return array1.every(function(value,index) {
+		return value === array2[index];
+	});
+};
+
+/*
+Push entries onto an array, removing them first if they already exist in the array
+	array: array to modify (assumed to be free of duplicates)
+	value: a single value to push or an array of values to push
+*/
+$tw.utils.pushTop = function(array,value) {
+	var t,p;
+	if($tw.utils.isArray(value)) {
+		// Remove any array entries that are duplicated in the new values
+		if(value.length !== 0) {
+			if(array.length !== 0) {
+				if(value.length < array.length) {
+					for(t=0; t<value.length; t++) {
+						p = array.indexOf(value[t]);
+						if(p !== -1) {
+							array.splice(p,1);
+						}
+					}
+				} else {
+					for(t=array.length-1; t>=0; t--) {
+						p = value.indexOf(array[t]);
+						if(p !== -1) {
+							array.splice(t,1);
+						}
+					}
+				}
+			}
+			// Push the values on top of the main array
+			array.push.apply(array,value);
+		}
+	} else {
+		p = array.indexOf(value);
+		if(p !== -1) {
+			array.splice(p,1);
+		}
+		array.push(value);
+	}
+	return array;
+};
+
 /*
 Determine if a value is a date
 */
@@ -867,6 +924,61 @@ $tw.Tiddler.prototype.hasField = function(field) {
 	return $tw.utils.hop(this.fields,field);
 };
 
+/*
+Compare two tiddlers for equality
+tiddler: the tiddler to compare
+excludeFields: array of field names to exclude from the comparison
+*/
+$tw.Tiddler.prototype.isEqual = function(tiddler,excludeFields) {
+	if(!(tiddler instanceof $tw.Tiddler)) {
+		return false;
+	}
+	excludeFields = excludeFields || [];
+	var self = this,
+		differences = []; // Fields that have differences
+	// Add to the differences array
+	function addDifference(fieldName) {
+		// Check for this field being excluded
+		if(excludeFields.indexOf(fieldName) === -1) {
+			// Save the field as a difference
+			$tw.utils.pushTop(differences,fieldName);
+		}
+	}
+	// Returns true if the two values of this field are equal
+	function isFieldValueEqual(fieldName) {
+		var valueA = self.fields[fieldName],
+			valueB = tiddler.fields[fieldName];
+		// Check for identical string values
+		if(typeof(valueA) === "string" && typeof(valueB) === "string" && valueA === valueB) {
+			return true;
+		}
+		// Check for identical array values
+		if($tw.utils.isArray(valueA) && $tw.utils.isArray(valueB) && $tw.utils.isArrayEqual(valueA,valueB)) {
+			return true;
+		}
+		// Check for identical date values
+		if($tw.utils.isDate(valueA) && $tw.utils.isDate(valueB) && valueA.getTime() === valueB.getTime()) {
+			return true;
+		}
+		// Otherwise the fields must be different
+		return false;
+	}
+	// Compare our fields
+	for(var fieldName in this.fields) {
+		if(!isFieldValueEqual(fieldName)) {
+			addDifference(fieldName);
+		}
+	}
+	// There's a difference for every field in the other tiddler that we don't have
+	for(fieldName in tiddler.fields) {
+		if(!(fieldName in this.fields)) {
+			addDifference(fieldName);
+		}
+	}
+	// Return whether there were any differences
+	return differences.length === 0;
+};
+
 /*
 Register and install the built in tiddler field modules
 */
diff --git a/core/modules/tiddler.js b/core/modules/tiddler.js
index efec78b5c..8715fedfd 100644
--- a/core/modules/tiddler.js
+++ b/core/modules/tiddler.js
@@ -87,57 +87,6 @@ exports.getFieldStringBlock = function(options) {
 	return fields.join("\n");
 };
 
-/*
-Compare two tiddlers for equality
-tiddler: the tiddler to compare
-excludeFields: array of field names to exclude from the comparison
-*/
-exports.isEqual = function(tiddler,excludeFields) {
-	if(!(tiddler instanceof $tw.Tiddler)) {
-		return false;
-	}
-	excludeFields = excludeFields || [];
-	var self = this,
-		differences = []; // Fields that have differences
-	// Add to the differences array
-	function addDifference(fieldName) {
-		// Check for this field being excluded
-		if(excludeFields.indexOf(fieldName) === -1) {
-			// Save the field as a difference
-			$tw.utils.pushTop(differences,fieldName);
-		}
-	}
-	// Returns true if the two values of this field are equal
-	function isFieldValueEqual(fieldName) {
-		var valueA = self.fields[fieldName],
-			valueB = tiddler.fields[fieldName];
-		// Check for identical string values
-		if(typeof(valueA) === "string" && typeof(valueB) === "string" && valueA === valueB) {
-			return true;
-		}
-		// Check for identical array values
-		if($tw.utils.isArray(valueA) && $tw.utils.isArray(valueB) && $tw.utils.isArrayEqual(valueA,valueB)) {
-			return true;
-		}
-		// Otherwise the fields must be different
-		return false;
-	}
-	// Compare our fields
-	for(var fieldName in this.fields) {
-		if(!isFieldValueEqual(fieldName)) {
-			addDifference(fieldName);
-		}
-	}
-	// There's a difference for every field in the other tiddler that we don't have
-	for(fieldName in tiddler.fields) {
-		if(!(fieldName in this.fields)) {
-			addDifference(fieldName);
-		}
-	}
-	// Return whether there were any differences
-	return differences.length === 0;
-};
-
 exports.getFieldDay = function(field) {
 	if(this.cache && this.cache.day && $tw.utils.hop(this.cache.day,field) ) {
 		return this.cache.day[field];
diff --git a/core/modules/utils/utils.js b/core/modules/utils/utils.js
index e3390f9c7..8dba0ce0a 100644
--- a/core/modules/utils/utils.js
+++ b/core/modules/utils/utils.js
@@ -132,23 +132,6 @@ exports.count = function(object) {
 	return Object.keys(object || {}).length;
 };
 
-/*
-Check if an array is equal by value and by reference.
-*/
-exports.isArrayEqual = function(array1,array2) {
-	if(array1 === array2) {
-		return true;
-	}
-	array1 = array1 || [];
-	array2 = array2 || [];
-	if(array1.length !== array2.length) {
-		return false;
-	}
-	return array1.every(function(value,index) {
-		return value === array2[index];
-	});
-};
-
 /*
 Determine whether an array-item is an object-property
 */
@@ -161,46 +144,6 @@ exports.hopArray = function(object,array) {
 	return false;
 };
 
-/*
-Push entries onto an array, removing them first if they already exist in the array
-	array: array to modify (assumed to be free of duplicates)
-	value: a single value to push or an array of values to push
-*/
-exports.pushTop = function(array,value) {
-	var t,p;
-	if($tw.utils.isArray(value)) {
-		// Remove any array entries that are duplicated in the new values
-		if(value.length !== 0) {
-			if(array.length !== 0) {
-				if(value.length < array.length) {
-					for(t=0; t<value.length; t++) {
-						p = array.indexOf(value[t]);
-						if(p !== -1) {
-							array.splice(p,1);
-						}
-					}
-				} else {
-					for(t=array.length-1; t>=0; t--) {
-						p = value.indexOf(array[t]);
-						if(p !== -1) {
-							array.splice(t,1);
-						}
-					}
-				}
-			}
-			// Push the values on top of the main array
-			array.push.apply(array,value);
-		}
-	} else {
-		p = array.indexOf(value);
-		if(p !== -1) {
-			array.splice(p,1);
-		}
-		array.push(value);
-	}
-	return array;
-};
-
 /*
 Remove entries from an array
 	array: array to modify