com.geotab.model.serialization.DateTimeSerializationUtil Maven / Gradle / Ivy

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/*
 *
 * 2020 Copyright (C) Geotab Inc. All rights reserved.
 */

package com.geotab.model.serialization;

import java.time.Clock;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.chrono.IsoChronology;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import lombok.experimental.UtilityClass;
import org.apache.commons.lang3.StringUtils;

@UtilityClass
public class DateTimeSerializationUtil {

  private static final String DATETIME_INPUT_PATTERN = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
  private static final String DATE_INPUT_PATTERN = "yyyy-MM-dd";

  private static final DateTimeFormatter DATE_TIME_FORMATTER = DateTimeFormatter
      .ofPattern(DATETIME_INPUT_PATTERN)
      .withChronology(IsoChronology.INSTANCE);

  private static final DateTimeFormatter DATE_TIME_PARSE_FORMATTER = new DateTimeFormatterBuilder()
      .append(DateTimeFormatter.ISO_LOCAL_DATE_TIME)
      .optionalStart()
      .appendOffset("+HH", "Z")
      .optionalEnd()
      .toFormatter();

  private static DateTimeFormatter DATE_FORMATTER = DateTimeFormatter.ofPattern(DATE_INPUT_PATTERN)
      .withChronology(IsoChronology.INSTANCE);

  public static LocalDateTime localDateTimeFromString(String dateTimeString) {
    if (StringUtils.isEmpty(dateTimeString)) {
      return null;
    }

    if (!dateTimeString.contains("T")) {
      dateTimeString += "T00:00:00.000Z";
    }

    return LocalDateTime.parse(dateTimeString, DATE_TIME_PARSE_FORMATTER);
  }

  public static String localDateTimeToString(LocalDateTime dateTime) {
    if (dateTime == null) {
      return null;
    }
    return dateTime.format(DATE_TIME_FORMATTER);
  }

  public static LocalDate localDateFromString(String dateString) {
    if (StringUtils.isEmpty(dateString)) {
      return null;
    }

    return LocalDate.parse(dateString, DATE_FORMATTER);
  }

  public static String localDateToString(LocalDate localDate) {
    if (localDate == null) {
      return null;
    }
    return localDate.format(DATE_FORMATTER);
  }

  public static LocalDateTime nowUtcLocalDateTime() {
    return LocalDateTime.now(Clock.systemUTC());
  }

  public static LocalDateTime localDateTimeToUtc(LocalDateTime localDateTime) {
    ZonedDateTime zonedDateTime = localDateTime.atZone(ZoneId.systemDefault());

    ZonedDateTime utcZoned = zonedDateTime.withZoneSameInstant(ZoneId.of("UTC"));

    return utcZoned.toLocalDateTime();
  }
}