diff --git a/bcprov/src/main/java/org/bouncycastle/asn1/ASN1GeneralizedTime.java b/bcprov/src/main/java/org/bouncycastle/asn1/ASN1GeneralizedTime.java
index 089526e..0e2be64 100644
--- a/bcprov/src/main/java/org/bouncycastle/asn1/ASN1GeneralizedTime.java
+++ b/bcprov/src/main/java/org/bouncycastle/asn1/ASN1GeneralizedTime.java
@@ -3,6 +3,7 @@
 import java.io.IOException;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
+import java.util.Calendar;
 import java.util.Date;
 import java.util.Locale;
 import java.util.SimpleTimeZone;
@@ -109,7 +110,10 @@
     public ASN1GeneralizedTime(
         Date time)
     {
-        SimpleDateFormat dateF = new SimpleDateFormat("yyyyMMddHHmmss'Z'");
+        // BEGIN android-changed
+        // Was: SimpleDateFormat dateF = new SimpleDateFormat("yyyyMMddHHmmss'Z'");
+        SimpleDateFormat dateF = new SimpleDateFormat("yyyyMMddHHmmss'Z'", Locale.US);
+        // END android-changed
 
         dateF.setTimeZone(new SimpleTimeZone(0, "Z"));
 
@@ -127,7 +131,11 @@
         Date time,
         Locale locale)
     {
-        SimpleDateFormat dateF = new SimpleDateFormat("yyyyMMddHHmmss'Z'", locale);
+        // BEGIN android-changed
+        // Was: SimpleDateFormat dateF = new SimpleDateFormat("yyyyMMddHHmmss'Z'", locale);
+        SimpleDateFormat dateF = new SimpleDateFormat("yyyyMMddHHmmss'Z'", Locale.US);
+        dateF.setCalendar(Calendar.getInstance(Locale.US));
+        // END android-changed
 
         dateF.setTimeZone(new SimpleTimeZone(0, "Z"));
 
@@ -252,11 +260,17 @@
         {
             if (hasFractionalSeconds())
             {
-                dateF = new SimpleDateFormat("yyyyMMddHHmmss.SSS'Z'");
+                // BEGIN android-changed
+                // Was: dateF = new SimpleDateFormat("yyyyMMddHHmmss.SSS'Z'");
+                dateF = new SimpleDateFormat("yyyyMMddHHmmss.SSS'Z'", Locale.US);
+                // END android-changed
             }
             else
             {
-                dateF = new SimpleDateFormat("yyyyMMddHHmmss'Z'");
+                // BEGIN android-changed
+                // Was: dateF = new SimpleDateFormat("yyyyMMddHHmmss'Z'");
+                dateF = new SimpleDateFormat("yyyyMMddHHmmss'Z'", Locale.US);
+                // END android-changed
             }
 
             dateF.setTimeZone(new SimpleTimeZone(0, "Z"));
@@ -266,11 +280,17 @@
             d = this.getTime();
             if (hasFractionalSeconds())
             {
-                dateF = new SimpleDateFormat("yyyyMMddHHmmss.SSSz");
+                // BEGIN android-changed
+                // Was: dateF = new SimpleDateFormat("yyyyMMddHHmmss.SSSz");
+                dateF = new SimpleDateFormat("yyyyMMddHHmmss.SSSz", Locale.US);
+                // END android-changed
             }
             else
             {
-                dateF = new SimpleDateFormat("yyyyMMddHHmmssz");
+                // BEGIN android-changed
+                // Was: dateF = new SimpleDateFormat("yyyyMMddHHmmssz");
+                dateF = new SimpleDateFormat("yyyyMMddHHmmssz", Locale.US);
+                // END android-changed
             }
 
             dateF.setTimeZone(new SimpleTimeZone(0, "Z"));
@@ -279,11 +299,17 @@
         {
             if (hasFractionalSeconds())
             {
-                dateF = new SimpleDateFormat("yyyyMMddHHmmss.SSS");
+                // BEGIN android-changed
+                // dateF = new SimpleDateFormat("yyyyMMddHHmmss.SSS");
+                dateF = new SimpleDateFormat("yyyyMMddHHmmss.SSS", Locale.US);
+                // END android-changed
             }
             else
             {
-                dateF = new SimpleDateFormat("yyyyMMddHHmmss");
+                // BEGIN android-changed
+                // Was: dateF = new SimpleDateFormat("yyyyMMddHHmmss");
+                dateF = new SimpleDateFormat("yyyyMMddHHmmss", Locale.US);
+                // END android-changed
             }
 
             dateF.setTimeZone(new SimpleTimeZone(0, TimeZone.getDefault().getID()));
diff --git a/bcprov/src/main/java/org/bouncycastle/asn1/ASN1UTCTime.java b/bcprov/src/main/java/org/bouncycastle/asn1/ASN1UTCTime.java
index 2c82df3..41ce817 100644
--- a/bcprov/src/main/java/org/bouncycastle/asn1/ASN1UTCTime.java
+++ b/bcprov/src/main/java/org/bouncycastle/asn1/ASN1UTCTime.java
@@ -3,6 +3,7 @@
 import java.io.IOException;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
+import java.util.Calendar;
 import java.util.Date;
 import java.util.Locale;
 import java.util.SimpleTimeZone;
@@ -123,7 +124,10 @@
     public ASN1UTCTime(
         Date time)
     {
-        SimpleDateFormat dateF = new SimpleDateFormat("yyMMddHHmmss'Z'");
+        // BEGIN android-changed
+        // Was: SimpleDateFormat dateF = new SimpleDateFormat("yyMMddHHmmss'Z'");
+        SimpleDateFormat dateF = new SimpleDateFormat("yyMMddHHmmss'Z'", Locale.US);
+        // END android-changed
 
         dateF.setTimeZone(new SimpleTimeZone(0,"Z"));
 
@@ -141,7 +145,11 @@
         Date time,
         Locale locale)
     {
-        SimpleDateFormat dateF = new SimpleDateFormat("yyMMddHHmmss'Z'", locale);
+        // BEGIN android-changed
+        // Was: SimpleDateFormat dateF = new SimpleDateFormat("yyMMddHHmmss'Z'", locale);
+        SimpleDateFormat dateF = new SimpleDateFormat("yyMMddHHmmss'Z'", Locale.US);
+        dateF.setCalendar(Calendar.getInstance(locale));
+        // END android-changed
 
         dateF.setTimeZone(new SimpleTimeZone(0,"Z"));
 
@@ -164,7 +172,10 @@
     public Date getDate()
         throws ParseException
     {
-        SimpleDateFormat dateF = new SimpleDateFormat("yyMMddHHmmssz");
+        // BEGIN android-changed
+        // Was: SimpleDateFormat dateF = new SimpleDateFormat("yyMMddHHmmssz");
+        SimpleDateFormat dateF = new SimpleDateFormat("yyMMddHHmmssz", Locale.US);
+        // END android-changed
 
         return dateF.parse(getTime());
     }
@@ -179,7 +190,10 @@
     public Date getAdjustedDate()
         throws ParseException
     {
-        SimpleDateFormat dateF = new SimpleDateFormat("yyyyMMddHHmmssz");
+        // BEGIN android-changed
+        // Was: SimpleDateFormat dateF = new SimpleDateFormat("yyyyMMddHHmmssz");
+        SimpleDateFormat dateF = new SimpleDateFormat("yyyyMMddHHmmssz", Locale.US);
+        // END android-changed
 
         dateF.setTimeZone(new SimpleTimeZone(0, "Z"));
 
diff --git a/bcprov/src/main/java/org/bouncycastle/asn1/cms/Time.java b/bcprov/src/main/java/org/bouncycastle/asn1/cms/Time.java
index 84f12a9..ed9a6c0 100644
--- a/bcprov/src/main/java/org/bouncycastle/asn1/cms/Time.java
+++ b/bcprov/src/main/java/org/bouncycastle/asn1/cms/Time.java
@@ -2,6 +2,7 @@
 
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
+import java.util.Calendar;
 import java.util.Date;
 import java.util.Locale;
 import java.util.SimpleTimeZone;
@@ -70,7 +71,10 @@
         Date    time)
     {
         SimpleTimeZone      tz = new SimpleTimeZone(0, "Z");
-        SimpleDateFormat    dateF = new SimpleDateFormat("yyyyMMddHHmmss");
+        // BEGIN android-changed
+        // Was: SimpleDateFormat    dateF = new SimpleDateFormat("yyyyMMddHHmmss");
+        SimpleDateFormat    dateF = new SimpleDateFormat("yyyyMMddHHmmss", Locale.US);
+        // END android-changed
 
         dateF.setTimeZone(tz);
 
@@ -101,7 +105,11 @@
         Locale locale)
     {
         SimpleTimeZone      tz = new SimpleTimeZone(0, "Z");
-        SimpleDateFormat    dateF = new SimpleDateFormat("yyyyMMddHHmmss", locale);
+        // BEGIN android-changed
+        // Was: SimpleDateFormat    dateF = new SimpleDateFormat("yyyyMMddHHmmss", locale);
+        SimpleDateFormat    dateF = new SimpleDateFormat("yyyyMMddHHmmss", Locale.US);
+        dateF.setCalendar(Calendar.getInstance(locale));
+        // END android-changed
 
         dateF.setTimeZone(tz);
 
diff --git a/bcprov/src/main/java/org/bouncycastle/asn1/x509/Time.java b/bcprov/src/main/java/org/bouncycastle/asn1/x509/Time.java
index 77d36b3..989de4c 100644
--- a/bcprov/src/main/java/org/bouncycastle/asn1/x509/Time.java
+++ b/bcprov/src/main/java/org/bouncycastle/asn1/x509/Time.java
@@ -2,6 +2,7 @@
 
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
+import java.util.Calendar;
 import java.util.Date;
 import java.util.Locale;
 import java.util.SimpleTimeZone;
@@ -51,7 +52,10 @@
         Date    time)
     {
         SimpleTimeZone      tz = new SimpleTimeZone(0, "Z");
-        SimpleDateFormat    dateF = new SimpleDateFormat("yyyyMMddHHmmss");
+        // BEGIN android-changed
+        // Was: SimpleDateFormat    dateF = new SimpleDateFormat("yyyyMMddHHmmss");
+        SimpleDateFormat    dateF = new SimpleDateFormat("yyyyMMddHHmmss", Locale.US);
+        // END android-changed
 
         dateF.setTimeZone(tz);
 
@@ -82,7 +86,11 @@
         Locale locale)
     {
         SimpleTimeZone      tz = new SimpleTimeZone(0, "Z");
-        SimpleDateFormat    dateF = new SimpleDateFormat("yyyyMMddHHmmss", locale);
+        // BEGIN android-changed
+        // Was: SimpleDateFormat    dateF = new SimpleDateFormat("yyyyMMddHHmmss", locale);
+        SimpleDateFormat    dateF = new SimpleDateFormat("yyyyMMddHHmmss", Locale.US);
+        dateF.setCalendar(Calendar.getInstance(locale));
+        // END android-changed
 
         dateF.setTimeZone(tz);