Index: solr/src/test/org/apache/solr/TestTrie.java
===================================================================
--- solr/src/test/org/apache/solr/TestTrie.java	(revision 945275)
+++ solr/src/test/org/apache/solr/TestTrie.java	(working copy)
@@ -171,7 +171,7 @@
     assertQ("Range filter tint:[* to *] must match 10 documents", req("q", "*:*", "fq", "tdate:[* TO *]"), "//*[@numFound='10']");
 
     // Test date math syntax
-    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
+    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
     format.setTimeZone(TimeZone.getTimeZone("UTC"));
 
     assertU(delQ("*:*"));
@@ -222,7 +222,7 @@
     checkPrecisionSteps("tdate");
 
     // For tdate tests
-    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
+    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
     format.setTimeZone(TimeZone.getTimeZone("UTC"));
     DateMathParser dmp = new DateMathParser(DateField.UTC, Locale.US);
 
Index: solr/src/test/org/apache/solr/request/TestFaceting.java
===================================================================
--- solr/src/test/org/apache/solr/request/TestFaceting.java	(revision 945275)
+++ solr/src/test/org/apache/solr/request/TestFaceting.java	(working copy)
@@ -24,6 +24,7 @@
 import org.junit.Test;
 import static org.junit.Assert.*;
 
+import java.util.Locale;
 import java.util.Random;
 
 /**
@@ -43,7 +44,7 @@
   }
 
   String t(int tnum) {
-    return String.format("%08d", tnum);
+    return String.format(Locale.US, "%08d", tnum);
   }
   
   void createIndex(int nTerms) {
Index: solr/src/java/org/apache/solr/core/CoreContainer.java
===================================================================
--- solr/src/java/org/apache/solr/core/CoreContainer.java	(revision 945275)
+++ solr/src/java/org/apache/solr/core/CoreContainer.java	(working copy)
@@ -425,7 +425,7 @@
         schemaFile = new File(solrLoader.getInstanceDir() + "conf" + File.separator + dcore.getSchemaName());
       }
       if(schemaFile. exists()){
-        String key = schemaFile.getAbsolutePath()+":"+new SimpleDateFormat("yyyyMMddhhmmss").format(new Date(schemaFile.lastModified()));
+        String key = schemaFile.getAbsolutePath()+":"+new SimpleDateFormat("yyyyMMddhhmmss", Locale.US).format(new Date(schemaFile.lastModified()));
         schema = indexSchemaCache.get(key);
         if(schema == null){
           log.info("creating new schema object for core: " + dcore.name);
Index: solr/src/java/org/apache/solr/handler/SnapShooter.java
===================================================================
--- solr/src/java/org/apache/solr/handler/SnapShooter.java	(revision 945275)
+++ solr/src/java/org/apache/solr/handler/SnapShooter.java	(working copy)
@@ -24,6 +24,7 @@
 import java.text.SimpleDateFormat;
 import java.util.Collection;
 import java.util.Date;
+import java.util.Locale;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.lucene.index.IndexCommit;
@@ -76,7 +77,7 @@
     String directoryName = null;
     Lock lock = null;
     try {
-      SimpleDateFormat fmt = new SimpleDateFormat(DATE_FMT);
+      SimpleDateFormat fmt = new SimpleDateFormat(DATE_FMT, Locale.US);
       directoryName = "snapshot." + fmt.format(new Date());
       lock = lockFactory.makeLock(directoryName + ".lock");
       if (lock.isLocked()) return;
Index: solr/src/java/org/apache/solr/handler/SnapPuller.java
===================================================================
--- solr/src/java/org/apache/solr/handler/SnapPuller.java	(revision 945275)
+++ solr/src/java/org/apache/solr/handler/SnapPuller.java	(working copy)
@@ -481,7 +481,7 @@
    * All the files are copied to a temp dir first
    */
   private File createTempindexDir(SolrCore core) {
-    String tmpIdxDirName = "index." + new SimpleDateFormat(SnapShooter.DATE_FMT).format(new Date());
+    String tmpIdxDirName = "index." + new SimpleDateFormat(SnapShooter.DATE_FMT, Locale.US).format(new Date());
     File tmpIdxDir = new File(core.getDataDir(), tmpIdxDirName);
     tmpIdxDir.mkdirs();
     return tmpIdxDir;
@@ -649,7 +649,7 @@
   }
 
   private String getDateAsStr(Date d) {
-    return new SimpleDateFormat(SnapShooter.DATE_FMT).format(d);
+    return new SimpleDateFormat(SnapShooter.DATE_FMT, Locale.US).format(d);
   }
 
   /**
Index: solr/src/java/org/apache/solr/response/JSONResponseWriter.java
===================================================================
--- solr/src/java/org/apache/solr/response/JSONResponseWriter.java	(revision 945275)
+++ solr/src/java/org/apache/solr/response/JSONResponseWriter.java	(working copy)
@@ -743,7 +743,7 @@
     // builder's buffer.
 
     StringBuilder sb = new StringBuilder();
-    if (cal==null) cal = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
+    if (cal==null) cal = Calendar.getInstance(TimeZone.getTimeZone("GMT"), Locale.US);
     cal.setTime(val);
 
     int i = cal.get(Calendar.YEAR);
Index: solr/src/java/org/apache/solr/response/XMLWriter.java
===================================================================
--- solr/src/java/org/apache/solr/response/XMLWriter.java	(revision 945275)
+++ solr/src/java/org/apache/solr/response/XMLWriter.java	(working copy)
@@ -162,7 +162,7 @@
   // temporary working objects...
   // be careful not to use these recursively...
   private final ArrayList tlst = new ArrayList();
-  private final Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
+  private final Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT"), Locale.US);
   private final StringBuilder sb = new StringBuilder();
 
   public XMLWriter(Writer writer, IndexSchema schema, SolrQueryRequest req, String version) {
Index: solr/src/common/org/apache/solr/common/util/DateUtil.java
===================================================================
--- solr/src/common/org/apache/solr/common/util/DateUtil.java	(revision 945275)
+++ solr/src/common/org/apache/solr/common/util/DateUtil.java	(working copy)
@@ -56,7 +56,7 @@
   private static final Date DEFAULT_TWO_DIGIT_YEAR_START;
 
   static {
-    Calendar calendar = Calendar.getInstance();
+    Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("GMT"), Locale.US);
     calendar.set(2000, Calendar.JANUARY, 1, 0, 0);
     DEFAULT_TWO_DIGIT_YEAR_START = calendar.getTime();
   }
@@ -185,7 +185,7 @@
     public ThreadLocalDateFormat() {
       super();
       //2007-04-26T08:05:04Z
-      SimpleDateFormat tmp = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
+      SimpleDateFormat tmp = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
       tmp.setTimeZone(UTC);
       proto = tmp;
     }