1 files changed, 113 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/lang3/time/GmtTimeZone.java b/src/main/java/org/apache/commons/lang3/time/GmtTimeZone.java
new file mode 100644
index 000000000..82e2dc1b0
--- /dev/null
+++ b/src/main/java/org/apache/commons/lang3/time/GmtTimeZone.java
@@ -0,0 +1,113 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.lang3.time;
+
+import java.util.Date;
+import java.util.Objects;
+import java.util.TimeZone;
+
+/**
+ * Custom time zone that contains offset from GMT.
+ *
+ * @since 3.7
+ */
+class GmtTimeZone extends TimeZone {
+
+    private static final int MILLISECONDS_PER_MINUTE = 60 * 1000;
+    private static final int MINUTES_PER_HOUR = 60;
+    private static final int HOURS_PER_DAY = 24;
+
+    // Serializable!
+    static final long serialVersionUID = 1L;
+
+    private static StringBuilder twoDigits(final StringBuilder sb, final int n) {
+        return sb.append((char) ('0' + (n / 10))).append((char) ('0' + (n % 10)));
+    }
+    private final int offset;
+
+    private final String zoneId;
+
+    GmtTimeZone(final boolean negate, final int hours, final int minutes) {
+        if (hours >= HOURS_PER_DAY) {
+            throw new IllegalArgumentException(hours + " hours out of range");
+        }
+        if (minutes >= MINUTES_PER_HOUR) {
+            throw new IllegalArgumentException(minutes + " minutes out of range");
+        }
+        final int milliseconds = (minutes + (hours * MINUTES_PER_HOUR)) * MILLISECONDS_PER_MINUTE;
+        offset = negate ? -milliseconds : milliseconds;
+        // @formatter:off
+        zoneId = twoDigits(twoDigits(new StringBuilder(9)
+            .append(TimeZones.GMT_ID)
+            .append(negate ? '-' : '+'), hours)
+            .append(':'), minutes)
+            .toString();
+        // @formatter:on
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (!(obj instanceof GmtTimeZone)) {
+            return false;
+        }
+        final GmtTimeZone other = (GmtTimeZone) obj;
+        return offset == other.offset && Objects.equals(zoneId, other.zoneId);
+    }
+
+    @Override
+    public String getID() {
+        return zoneId;
+    }
+
+    @Override
+    public int getOffset(final int era, final int year, final int month, final int day, final int dayOfWeek, final int milliseconds) {
+        return offset;
+    }
+
+    @Override
+    public int getRawOffset() {
+        return offset;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(offset, zoneId);
+    }
+
+    @Override
+    public boolean inDaylightTime(final Date date) {
+        return false;
+    }
+
+    @Override
+    public void setRawOffset(final int offsetMillis) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public String toString() {
+        return "[GmtTimeZone id=\"" + zoneId + "\",offset=" + offset + ']';
+    }
+
+    @Override
+    public boolean useDaylightTime() {
+        return false;
+    }
+}