Improve date localization for API >= 18 (4.3, JELLY_BEAN_MR2)

Fixes #3102
Closes #4597

res/layout/message_details_header.xml

@@ -34,7 +34,8 @@
 
         <TableLayout android:id="@+id/metadata_container"
                      android:layout_width="match_parent"
-                     android:layout_height="match_parent">
+                     android:layout_height="match_parent"
+                     android:shrinkColumns="1">
 
             <TableRow android:id="@+id/sent_container"
                       android:layout_width="match_parent"
@@ -51,7 +52,7 @@
                           android:layout_width="wrap_content"
                           android:layout_height="wrap_content"
                           android:layout_marginLeft="@dimen/message_details_table_row_pad"
-                          tools:text="Jan 18, 9:29AM" />
+                          tools:text="Jan 18, 2015, 12:29:37 AM GMT-08:00" />
 
             </TableRow>
 
@@ -70,7 +71,7 @@
                           android:layout_width="wrap_content"
                           android:layout_height="wrap_content"
                           android:layout_marginLeft="@dimen/message_details_table_row_pad"
-                          tools:text="Jan 18, 9:31AM" />
+                          tools:text="Jan 18, 2015, 12:31:15 AM GMT-08:00" />
 
             </TableRow>
 

src/org/thoughtcrime/securesms/util/DateUtils.java

@@ -17,6 +17,7 @@
 package org.thoughtcrime.securesms.util;
 
 import android.content.Context;
+import android.os.Build;
 import android.text.format.DateFormat;
 
 import java.text.SimpleDateFormat;
@@ -41,7 +42,7 @@ public class DateUtils extends android.text.format.DateUtils {
   }
 
   private static String getFormattedDateTime(long time, String template, Locale locale) {
-    String localizedPattern = new SimpleDateFormat(template, locale).toLocalizedPattern();
+    final String localizedPattern = getLocalizedPattern(template, locale);
     return new SimpleDateFormat(localizedPattern, locale).format(new Date(time));
   }
 
@@ -86,12 +87,19 @@ public class DateUtils extends android.text.format.DateUtils {
     String dateFormatPattern;
 
     if (DateFormat.is24HourFormat(context)) {
-      dateFormatPattern = "MMM d, yyyy HH:mm:ss zzz";
+      dateFormatPattern = getLocalizedPattern("MMM d, yyyy HH:mm:ss zzz", locale);
     } else {
-      dateFormatPattern = "MMM d, yyyy hh:mm:ss a zzz";
+      dateFormatPattern = getLocalizedPattern("MMM d, yyyy hh:mm:ss a zzz", locale);
     }
 
     return new SimpleDateFormat(dateFormatPattern, locale);
   }
 
+  private static String getLocalizedPattern(String template, Locale locale) {
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
+      return DateFormat.getBestDateTimePattern(locale, template);
+    } else {
+      return new SimpleDateFormat(template, locale).toLocalizedPattern();
+    }
+  }
 }