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There is a newer version: 2.0.0-rc-1

/*
 * Copyright 2014 the original author or authors.
 *
 * Licensed 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 ratpack.util.internal;

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.concurrent.TimeUnit;

public abstract class NumberUtil {

  public static BigDecimal convertNanoDiff(long startNanos, long stopNanos, TimeUnit timeUnit) {
    BigDecimal diffNanos = new BigDecimal(stopNanos - startNanos);
    return diffNanos.divide(BigDecimal.valueOf(timeUnit.toNanos(1)));
  }

  public static String toMillisDiffString(long startNanos, long stopNanos) {
    return convertNanoDiff(startNanos, stopNanos, TimeUnit.MILLISECONDS).setScale(5, RoundingMode.UP).toString();
  }

}