public  static void setGlobalTimeOffset(int timeOffset) {
        globalTimeOffset = timeOffset;
    }
Sets the global time difference in seconds between the running JVM and
AWS. If this value is set then all the subsequent instantiation of an
<code>AmazonHttpClient</code> will start using this
value to generate timestamps.

@param timeOffset
           the time difference in seconds between the running JVM and AWS
aws-java-sdk-core/src/main/java/com/amazonaws/SDKGlobalTime.java