Calculate the elapsed time in seconds

CalcUtil.java

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.time.Duration;
import java.time.Instant;

public class CalcUtil {

  private static final BigDecimal MULTIPLIER_NANO_TO_SECONDS = new BigDecimal(1.0E9D);
  /**
   * Calculate the elapsed time in seconds
   *
   * @param init initial time
   * @return time in seconds
   */
  public static double calcTimeElapsedInSeconds(Instant init) {
    var finish = Instant.now();
    BigDecimal diff = new BigDecimal(Duration.between(init, finish).toNanos());
    return diff.divide(MULTIPLIER_NANO_TO_SECONDS, 9, RoundingMode.HALF_UP).doubleValue();
  }
}