TimeHelper

import java.time.Duration;
import java.time.Instant;
import java.time.OffsetDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.time.DurationFormatUtils;

@Slf4j
public class TimeHelper {

  public static final DateTimeFormatter FORMATTER =
      DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS[XXX][X]");

  public static Instant parseTimeStamp(String timeStamp) {
    return OffsetDateTime.parse(timeStamp, FORMATTER).toInstant();
  }

  public static String getDuration(String startTimeStamp, String endTimeStamp) {
    String duration = "";
    try {
      duration =
          DurationFormatUtils.formatDurationWords(
              Duration.between(parseTimeStamp(startTimeStamp), parseTimeStamp(endTimeStamp))
                  .toMillis(),
              true,
              true);
    } catch (NullPointerException | DateTimeParseException e) {
      log.error(e.getMessage(), e);
    }
    return duration;
  }
}

import java.time.Instant;
import java.time.LocalDate;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.Optional;
import java.util.Set;

private static final DateTimeFormatter VALUATION_TIMESTAMP_PARSER =
      DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss[.SSS][xxx][xx][X]");

  private Instant getTimeStampAsInstant(String timeStamp) {
    return Optional.ofNullable(timeStamp)
        .map(VALUATION_TIMESTAMP_PARSER::parse)
        .map(Instant::from)
        .orElse(null);
  }

import com.fasterxml.jackson.annotation.JsonFormat;
import java.time.Instant; 

@JsonFormat(pattern = "yyyy-MM-dd'T'HH:mm:ss.SSS[xxx][xx][X]")
  private Instant valuationTimeStamp;

private static final DateTimeFormatter VALUATION_TIMESTAMP_PARSER =
    DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss[.SSS][xxx][xx][X]");

import java.time.Duration;
import java.time.Instant;
import java.time.OffsetDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.time.DurationFormatUtils;

@Slf4j
public class TimeHelper {

  public static final DateTimeFormatter FORMATTER =
      DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS[XXX][X]");

  public static Instant parseTimeStamp(String timeStamp) {
    return OffsetDateTime.parse(timeStamp, FORMATTER).toInstant();
  }

  public static String getDuration(String startTimeStamp, String endTimeStamp) {
    String duration = "";
    try {
      duration =
          DurationFormatUtils.formatDuration(
              (Duration.between(parseTimeStamp(startTimeStamp), parseTimeStamp(endTimeStamp))
                  .toMillis()),
              "d'd' HH'h' mm'm' ss's'");
    } catch (NullPointerException | DateTimeParseException e) {
      log.error(e.getMessage(), e);
    }
    return duration;
  }
}