Add constant DateTimeUtils.UTC

h2/src/main/org/h2/expression/Function.java

@@ -1926,7 +1926,7 @@ public class Function extends Expression implements FunctionCall {
         default:
             break;
         }
-        calendar = DateTimeUtils.createGregorianCalendar(TimeZone.getTimeZone("UTC"));
+        calendar = DateTimeUtils.createGregorianCalendar(DateTimeUtils.UTC);
         calendar.setTimeInMillis(t1);
         int year1 = calendar.get(Calendar.YEAR);
         int month1 = calendar.get(Calendar.MONTH);

h2/src/main/org/h2/server/web/WebServer.java

@@ -31,6 +31,7 @@ import org.h2.message.DbException;
 import org.h2.server.Service;
 import org.h2.server.ShutdownHandler;
 import org.h2.store.fs.FileUtils;
+import org.h2.util.DateTimeUtils;
 import org.h2.util.JdbcUtils;
 import org.h2.util.MathUtils;
 import org.h2.util.NetUtils;
@@ -257,7 +258,7 @@ public class WebServer implements Service {
         if (startDateTime == null) {
             SimpleDateFormat format = new SimpleDateFormat(
                     "EEE, d MMM yyyy HH:mm:ss z", new Locale("en", ""));
-            format.setTimeZone(TimeZone.getTimeZone("GMT"));
+            format.setTimeZone(DateTimeUtils.UTC);
             startDateTime = format.format(System.currentTimeMillis());
         }
         return startDateTime;

h2/src/main/org/h2/util/DateTimeUtils.java

@@ -35,6 +35,11 @@ public class DateTimeUtils {
      */
     public static final long MILLIS_PER_DAY = 24 * 60 * 60 * 1000L;
 
+    /**
+     * UTC time zone.
+     */
+    public static final TimeZone UTC = TimeZone.getTimeZone("UTC");
+
     private static final long NANOS_PER_DAY = MILLIS_PER_DAY * 1000000;
 
     private static final int SHIFT_YEAR = 9;

h2/src/main/org/h2/value/ValueTimestamp.java

@@ -172,7 +172,7 @@ public class ValueTimestamp extends Value {
             int timeEnd = s.length();
             TimeZone tz = null;
             if (s.endsWith("Z")) {
-                tz = TimeZone.getTimeZone("UTC");
+                tz = DateTimeUtils.UTC;
                 timeEnd--;
             } else {
                 int timeZoneStart = s.indexOf('+', dateEnd + 1);

h2/src/main/org/h2/value/ValueTimestampTimeZone.java

@@ -40,8 +40,6 @@ public class ValueTimestampTimeZone extends Value {
      */
     static final int DEFAULT_SCALE = 10;
 
-    private static final TimeZone GMT_TIMEZONE = TimeZone.getTimeZone("GMT");
-
     /**
      * A bit field with bits for the year, month, and day (see DateTimeUtils for
      * encoding)
@@ -165,7 +163,7 @@ public class ValueTimestampTimeZone extends Value {
                 }
                 if (tz != null) {
                     long millis = DateTimeUtils
-                            .convertDateValueToMillis(GMT_TIMEZONE, dateValue);
+                            .convertDateValueToMillis(DateTimeUtils.UTC, dateValue);
                     tzMinutes = (short) (tz.getOffset(millis) / 1000 / 60);
                 }
             }
@@ -294,7 +292,7 @@ public class ValueTimestampTimeZone extends Value {
 
         // convert to minutes and add timezone offset
         long a = DateTimeUtils.convertDateValueToMillis(
-                TimeZone.getTimeZone("UTC"), dateValue) /
+                DateTimeUtils.UTC, dateValue) /
                 (1000L * 60L);
         long ma = timeNanos / (1000L * 1000L * 1000L * 60L);
         a += ma;
@@ -302,7 +300,7 @@ public class ValueTimestampTimeZone extends Value {
 
         // convert to minutes and add timezone offset
         long b = DateTimeUtils.convertDateValueToMillis(
-                TimeZone.getTimeZone("UTC"), t.dateValue) /
+                DateTimeUtils.UTC, t.dateValue) /
                 (1000L * 60L);
         long mb = t.timeNanos / (1000L * 1000L * 1000L * 60L);
         b += mb;

h2/src/test/org/h2/test/unit/TestDate.java

@@ -352,7 +352,7 @@ public class TestDate extends TestBase {
     }
 
     private void testValidDate() {
-        Calendar c = DateTimeUtils.createGregorianCalendar(TimeZone.getTimeZone("UTC"));
+        Calendar c = DateTimeUtils.createGregorianCalendar(DateTimeUtils.UTC);
         c.setLenient(false);
         for (int y = -2000; y < 3000; y++) {
             for (int m = -3; m <= 14; m++) {