Date Conversion utilities in JAVA

DateUtils

package com.titan.infra.dateutils;

import org.apache.commons.lang.StringUtils;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.*;


public class DateUtils {

    /**
     * Parse Date to String to give format and timezone
     * @param date
     * @param format
     * @param toTimeZone
     * @return
     */
    public static String formatDateToString(Date date, String format, String toTimeZone) {
        // null check
        if (Objects.isNull(date)) {
            return null;
        }
        // create SimpleDateFormat object
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
        // default system timezone if passed null or empty
        if (StringUtils.isBlank(toTimeZone)) {
            toTimeZone = Calendar.getInstance().getTimeZone().getID();
        }
        // set timezone to SimpleDateFormat
        if (StringUtils.isNotBlank(toTimeZone)) {
            simpleDateFormat.setTimeZone(TimeZone.getTimeZone(toTimeZone));
        }
        // set timezone to SimpleDateFormat
        simpleDateFormat.setTimeZone(TimeZone.getTimeZone(toTimeZone));

        // return Date in required format with timezone as String
        String formattedDate = simpleDateFormat.format(date);
        return formattedDate;
    }

    /**
     * Convert Date from One timezone to other
     * @param dateFrom
     * @param fromTimeZone
     * @param toTimeZone
     * @return
     */
    public static Date parseDate(Date dateFrom, String fromTimeZone, String toTimeZone) {
        String pattern = "yyyy/MM/dd HH:mm:ss";
        // From Zone format
        SimpleDateFormat sdfFromSimpleDateFormatFrom = new SimpleDateFormat(pattern);
        sdfFromSimpleDateFormatFrom.setTimeZone(TimeZone.getTimeZone(fromTimeZone));
        //To  Zone format
        SimpleDateFormat simpleDateFormatTo = new SimpleDateFormat(pattern);
        simpleDateFormatTo.setTimeZone(TimeZone.getTimeZone(toTimeZone));

        Date dateTo = null;
        try {
            dateTo = sdfFromSimpleDateFormatFrom.parse(simpleDateFormatTo.format(dateFrom));
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return dateTo;
    }

    /**
     * Format date as string
     * @param dateFrom
     * @param fromTimeZone
     * @param toTimeZone
     * @return
     */
    public static Date parseDateToString(Date dateFrom, String fromTimeZone, String toTimeZone) {
        String pattern = "yyyy/MM/dd HH:mm:ss";
        // From Zone format
        SimpleDateFormat sdfFromSimpleDateFormatFrom = new SimpleDateFormat(pattern);
        sdfFromSimpleDateFormatFrom.setTimeZone(TimeZone.getTimeZone(fromTimeZone));
        //To  Zone format
        SimpleDateFormat simpleDateFormatTo = new SimpleDateFormat(pattern);
        simpleDateFormatTo.setTimeZone(TimeZone.getTimeZone(toTimeZone));
        Date parsedDateTime = null;
        try {
            parsedDateTime = sdfFromSimpleDateFormatFrom.parse(simpleDateFormatTo.format(dateFrom));
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return parsedDateTime;
    }

    /**
     * Get Current UTC Date
     * @return Current UTC Date
     */
    public static Date getCurrentDate() {
        ZonedDateTime zonedDateTime = ZonedDateTime.now(ZoneOffset.UTC);
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd HH:mm:ss");
        DateFormat format = new SimpleDateFormat("yyyyMMdd HH:mm:ss");
        String dateStr = zonedDateTime.format(formatter);
        Date utcDate = null;
        try {
            utcDate = format.parse(dateStr);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return utcDate;

    }

//    public static void main(String[] args) {
//        Date currentDate = getCurrentDate();
//        System.out.println("DATE -> System Date in UTC: "+parseDate(currentDate, TimeZoneId.UTC, TimeZoneId.UTC));
//        System.out.println("STRING -> System Date in UTC: "+parseDateToString(currentDate, TimeZoneId.UTC, TimeZoneId.UTC));
//
//        System.out.println("DATE -> System Date in PST: "+parseDate(currentDate, TimeZoneId.UTC, TimeZoneId.PST));
//        System.out.println("STRING -> System Date in PST: "+parseDateToString(currentDate, TimeZoneId.UTC, TimeZoneId.PST));
//
//        System.out.println("DATE -> System Date in IST: "+parseDate(currentDate, TimeZoneId.UTC, TimeZoneId.IST));
//        System.out.println("STRING -> System Date in IST: "+parseDateToString(currentDate, TimeZoneId.UTC, TimeZoneId.IST));
//    }
}

TitanDateUtils.java

package com.titan.infra.dateutils;
import org.apache.commons.lang.StringUtils;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.*;


public class DateUtils {

    /**
     * Parse Date to String to give format and timezone
     * @param date
     * @param format
     * @param toTimeZone
     * @return
     */
    public static String formatDateToString(Date date, String format, String toTimeZone) {
        // null check
        if (Objects.isNull(date)) {
            return null;
        }
        // create SimpleDateFormat object
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);
        // default system timezone if passed null or empty
        if (StringUtils.isBlank(toTimeZone)) {
            toTimeZone = Calendar.getInstance().getTimeZone().getID();
        }
        // set timezone to SimpleDateFormat
        if (StringUtils.isNotBlank(toTimeZone)) {
            simpleDateFormat.setTimeZone(TimeZone.getTimeZone(toTimeZone));
        }
        // set timezone to SimpleDateFormat
        simpleDateFormat.setTimeZone(TimeZone.getTimeZone(toTimeZone));

        // return Date in required format with timezone as String
        String formattedDate = simpleDateFormat.format(date);
        return formattedDate;
    }

    /**
     * Convert Date from One timezone to other
     * @param dateFrom
     * @param fromTimeZone
     * @param toTimeZone
     * @return
     */
    public static Date parseDate(Date dateFrom, String fromTimeZone, String toTimeZone) {
        String pattern = "yyyy/MM/dd HH:mm:ss";
        // From Zone format
        SimpleDateFormat sdfFromSimpleDateFormatFrom = new SimpleDateFormat(pattern);
        sdfFromSimpleDateFormatFrom.setTimeZone(TimeZone.getTimeZone(fromTimeZone));
        //To  Zone format
        SimpleDateFormat simpleDateFormatTo = new SimpleDateFormat(pattern);
        simpleDateFormatTo.setTimeZone(TimeZone.getTimeZone(toTimeZone));

        Date dateTo = null;
        try {
            dateTo = sdfFromSimpleDateFormatFrom.parse(simpleDateFormatTo.format(dateFrom));
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return dateTo;
    }

    /**
     * Format date as string
     * @param dateFrom
     * @param fromTimeZone
     * @param toTimeZone
     * @return
     */
    public static Date parseDateToString(Date dateFrom, String fromTimeZone, String toTimeZone) {
        String pattern = "yyyy/MM/dd HH:mm:ss";
        // From Zone format
        SimpleDateFormat sdfFromSimpleDateFormatFrom = new SimpleDateFormat(pattern);
        sdfFromSimpleDateFormatFrom.setTimeZone(TimeZone.getTimeZone(fromTimeZone));
        //To  Zone format
        SimpleDateFormat simpleDateFormatTo = new SimpleDateFormat(pattern);
        simpleDateFormatTo.setTimeZone(TimeZone.getTimeZone(toTimeZone));
        Date parsedDateTime = null;
        try {
            parsedDateTime = sdfFromSimpleDateFormatFrom.parse(simpleDateFormatTo.format(dateFrom));
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return parsedDateTime;
    }

    /**
     * Get Current UTC Date
     * @return Current UTC Date
     */
    public static Date getCurrentDate() {
        ZonedDateTime zonedDateTime = ZonedDateTime.now(ZoneOffset.UTC);
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd HH:mm:ss");
        DateFormat format = new SimpleDateFormat("yyyyMMdd HH:mm:ss");
        String dateStr = zonedDateTime.format(formatter);
        Date utcDate = null;
        try {
            utcDate = format.parse(dateStr);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return utcDate;

    }

//    public static void main(String[] args) {
//        Date currentDate = getCurrentDate();
//        System.out.println("DATE -> System Date in UTC: "+parseDate(currentDate, TimeZoneId.UTC, TimeZoneId.UTC));
//        System.out.println("STRING -> System Date in UTC: "+parseDateToString(currentDate, TimeZoneId.UTC, TimeZoneId.UTC));
//
//        System.out.println("DATE -> System Date in PST: "+parseDate(currentDate, TimeZoneId.UTC, TimeZoneId.PST));
//        System.out.println("STRING -> System Date in PST: "+parseDateToString(currentDate, TimeZoneId.UTC, TimeZoneId.PST));
//
//        System.out.println("DATE -> System Date in IST: "+parseDate(currentDate, TimeZoneId.UTC, TimeZoneId.IST));
//        System.out.println("STRING -> System Date in IST: "+parseDateToString(currentDate, TimeZoneId.UTC, TimeZoneId.IST));
//    }
}