+ time test cases

src/main/java/com/jn/langx/util/Dates.java

@@ -25,6 +25,11 @@ public class Dates {
     public static final String DD_MM_YYYY = "dd/MM/yyyy";
     public static final String HH_mm_ss = "HH:mm:ss";
 
+    public static String format(@NonNull long millis, @NonNull String pattern) {
+        Preconditions.checkTrue(millis > 0);
+        return format(new Date(millis), pattern);
+    }
+
     public static String format(@NonNull Date date, @NonNull String pattern) {
         Preconditions.checkNotEmpty(pattern, "pattern is empty");
         Preconditions.checkNotNull(date);

src/main/java/com/jn/langx/util/InternalThreadLocalMap.java

@@ -49,7 +49,6 @@ public static InternalThreadLocalMap get() {
         return cache.get();
     }
 
-
     public static SimpleDateFormat getSimpleDateFormat(String pattern) {
         return get().simpleDateFormatMap.get(pattern);
     }

src/test/java/com/jn/langx/test/util/CalendersTests.java

@@ -1,9 +1,13 @@
 package com.jn.langx.test.util;
 
 import com.jn.langx.util.Dates;
+import com.jn.langx.util.collection.Collects;
+import com.jn.langx.util.comparator.ComparableComparator;
+import com.jn.langx.util.function.Consumer;
 import org.junit.Test;
 
 import java.util.Calendar;
+import java.util.Collection;
 import java.util.Date;
 import java.util.TimeZone;
 
@@ -38,4 +42,31 @@ public void name() {
         long t2 = actual_zero / Dates.DAY_TO_MILLIS * Dates.DAY_TO_MILLIS;
         System.out.println(t2 + "," + new Date(t2));
     }
+
+    @Test
+    public void testTimeZone() {
+        Collection<String> timeZoneIds = Collects.sort(Collects.asList(TimeZone.getAvailableIDs()), new ComparableComparator<String>());
+        Collects.forEach(timeZoneIds, new Consumer<String>() {
+            @Override
+            public void accept(String id) {
+                System.out.println(id);
+            }
+        });
+        System.out.println("default::::::" + TimeZone.getDefault().getID());
+    }
+
+
+    @Test
+    public void testTimeZone2() {
+        Calendar c1 = Calendar.getInstance();
+        long t1 = c1.getTimeInMillis();
+        System.out.println(c1.getTimeZone().getID() + " : " + t1);
+        Calendar c2 = Calendar.getInstance(TimeZone.getTimeZone("Asia/Tokyo"));
+        long t2 = c2.getTimeInMillis();
+        System.out.println(c2.getTimeZone().getID() + " : " + t2);
+
+        System.out.println("delta:" + (t2 - t1));
+    }
+
+
 }