String timestampISO8601 = SignatureUtils.awsV4ParseAndFormatDate( httpMethod);
String timestampISO8601 = SignatureUtils.awsV4ParseAndFormatDate( httpMethod);
String timestampISO8601 = SignatureUtils.awsV4ParseAndFormatDate( httpMethod);
String timestampISO8601 = SignatureUtils.awsV4ParseAndFormatDate( httpMethod);