Index: src/test/java/org/perf4j/chart/GoogleChartGeneratorTest.java
===================================================================
--- src/test/java/org/perf4j/chart/GoogleChartGeneratorTest.java	(revision 73)
+++ src/test/java/org/perf4j/chart/GoogleChartGeneratorTest.java	(working copy)
@@ -22,6 +22,7 @@
 
 import java.util.ResourceBundle;
 import java.util.Locale;
+import java.util.TimeZone;
 
 /**
  * Tests the GoogleChartGenerator
@@ -32,6 +33,8 @@
     private ResourceBundle expectedChartUrls;
 
     protected void setUp() throws Exception {
+        StatsValueRetriever.setTimeZone(TimeZone.getTimeZone("GMT-6"));
+
         expectedChartUrls = ResourceBundle.getBundle("org/perf4j/chart/googleChartTestExpectedValues");
     }
 
Index: src/main/java/org/perf4j/chart/GoogleChartGenerator.java
===================================================================
--- src/main/java/org/perf4j/chart/GoogleChartGenerator.java	(revision 73)
+++ src/main/java/org/perf4j/chart/GoogleChartGenerator.java	(working copy)
@@ -281,6 +281,7 @@
         //set up the axis labels - we use the US decimal format locale to ensure the decimal separator is . and not ,
         DecimalFormat decimalFormat = new DecimalFormat("##0.0", new DecimalFormatSymbols(Locale.US));
         SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");
+        dateFormat.setTimeZone(StatsValueRetriever.getTimeZone());
 
         //the y-axis label goes from 0 to the maximum data value
         String axisRangeParam = "&chxr=2,0," + decimalFormat.format(maxDataValue);
Index: src/main/java/org/perf4j/helpers/StatsValueRetriever.java
===================================================================
--- src/main/java/org/perf4j/helpers/StatsValueRetriever.java	(revision 73)
+++ src/main/java/org/perf4j/helpers/StatsValueRetriever.java	(working copy)
@@ -20,6 +20,7 @@
 import java.util.Map;
 import java.util.Collections;
 import java.util.LinkedHashMap;
+import java.util.TimeZone;
 
 /**
  * The StatsValueRetriever is used to enable retrieval of any of the statistics on the TimingStatistics object
@@ -28,6 +29,7 @@
  * @author Alex Devine
  */
 public abstract class StatsValueRetriever {
+
     public static final StatsValueRetriever MEAN_VALUE_RETRIEVER = new StatsValueRetriever() {
         public Number getStatsValue(TimingStatistics timingStats, long windowLength) {
             return (timingStats == null) ? 0.0 : timingStats.getMean();
@@ -106,7 +108,28 @@
         DEFAULT_RETRIEVERS = Collections.unmodifiableMap(defaultRetrievers);
     }
 
+    private static TimeZone timeZone;
+    static {
+        timeZone = TimeZone.getDefault();
+    }
+
     /**
+     * Returns the <tt>TimeZone</tt> that <tt>StatisticsChartGenerators</tt> should use to format this data.
+     * @return the timezone in which the statistics should be presented
+     */
+    public static TimeZone getTimeZone() {
+        return timeZone;
+    }
+
+    /**
+     * Sets the <tt>TimeZone</tt> which should be used to present this data.
+     * @param tz the timezone to use
+     */
+    public static void setTimeZone(TimeZone tz) {
+        timeZone = tz;
+    }
+
+    /**
      * Retrieves a single statistic value from the specified TimingStatistics object.
      *
      * @param timingStats  The TimingStatistics object containing the data to be retrieved.
@@ -129,4 +152,5 @@
      * @return The name of the value retrieved.
      */
     public abstract String getValueName();
+
 }