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package gew.util;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.Instant;
import java.time.ZonedDateTime;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* Date Time and Time Zone Helper, easy to convert different format of datetime across different time zones.
* This class is under continuous integration.
*
* @author Jason/GeW
* @since 2018-09-16
*/
public class TimeZoneHelper {
private static final String DATE_TIME_FORMAT_WITH_SEC = "yyyy-MM-dd HH:mm:ss";
private static final String DATE_TIME_FORMAT_WITH_MILLIS = "yyyy-MM-dd HH:mm:ss.SSS";
private static Map<String, String> TIMEZONE_WITH_OFFSET;
public enum ShortZoneId {
ACT,
AET,
AGT,
ART,
AST,
BET,
BST,
CAT,
CNT,
CST,
CTT,
EAT,
ECT,
IET,
IST,
JST,
MIT,
NET,
NST,
PLT,
PNT,
PRT,
PST,
SST,
VST,
EST,
MST,
HST
}
public static Map<String, String> getTypicalTimeZoneIdWithName() {
return ZoneId.SHORT_IDS;
}
public static Map<String, String> getAllTimeZoneIdWithOffset() {
Map<String, String> result = new HashMap<>(1024);
if (TIMEZONE_WITH_OFFSET != null) {
return TIMEZONE_WITH_OFFSET;
}
LocalDateTime datetime = LocalDateTime.now();
for (String zoneId : ZoneId.getAvailableZoneIds()) {
ZoneId zone = ZoneId.of(zoneId);
ZonedDateTime zdt = datetime.atZone(zone);
ZoneOffset zos = zdt.getOffset();
//replace Z to +00:00
String offset = zos.getId().replaceAll("Z", "+00:00");
result.put(zone.toString(), offset);
}
TIMEZONE_WITH_OFFSET = Collections.unmodifiableMap(result);
return TIMEZONE_WITH_OFFSET;
}
/**
* Retrieve TimeZone Offset By Location Name
* @param location String Location Name (America/Chicago)
* @return String UTC Offset (-06:00)
*/
public static String getTimeZoneOffsetByLocation(String location) {
if (TIMEZONE_WITH_OFFSET == null) {
getAllTimeZoneIdWithOffset();
}
return TIMEZONE_WITH_OFFSET.get(location);
}
/**
* Get Time Zone Area Name By UTC Offset
* @param offset String UTC Offset (-06:00)
* @return String Location Name (America/Chicago)
*/
public static Set<String> getTimeZoneIdByOffset(String offset) {
Set<String> result = new HashSet<>();
offset = offset.trim().toUpperCase();
if (offset.contains("UTC")) {
offset = offset.replace("UTC", "");
}
if (offset.length() < 6 || (!offset.contains("+") && !offset.contains("-"))) {
throw new IllegalArgumentException("Invalid Time Offset Format");
}
if (TIMEZONE_WITH_OFFSET == null) {
getAllTimeZoneIdWithOffset();
}
String finalOffset = offset.trim();
TIMEZONE_WITH_OFFSET.forEach((k, v) -> {if (v.equals(finalOffset)) result.add(k);});
return Collections.unmodifiableSet(result);
}
/**
* Convert Original ZonedDateTime to Destination ZonedDatetime
* @param dateTime ZoneDateTime of Original Location
* @param zoneId Destination ZoneId (String)
* @return ZoneDataTime of Destination Location
*/
public static ZonedDateTime toDestinationTimeZone(final ZonedDateTime dateTime, final String zoneId) {
return toDestinationTimeZone(dateTime, ZoneId.of(zoneId));
}
/**
* Convert Original ZonedDateTime to Destination ZonedDatetime
* @param dateTime ZoneDateTime of Original Location
* @param zoneId Destination ZoneId
* @return ZoneDataTime of Destination Location
*/
public static ZonedDateTime toDestinationTimeZone(final ZonedDateTime dateTime, final ZoneId zoneId) {
return dateTime.withZoneSameInstant(zoneId);
}
/**
* Convert Original ZonedDateTime to Destination ZonedDatetime
* @param dateTime ZoneDateTime of Original Location
* @param shortZoneId Destination Short ZoneID (CST)
* @return ZoneDataTime of Destination Location
*/
public static ZonedDateTime toDestinationTimeZone(final ZonedDateTime dateTime, ShortZoneId shortZoneId) {
return toDestinationTimeZone(dateTime, ZoneId.SHORT_IDS.get(shortZoneId.toString()));
}
/**
* Convert Original LocalDateTime to Destination ZonedDatetime
* @param dateTime LocalDateTime of Original Location
* @param origin Original Location ZoneId
* @param destination Destination ZoneId
* @return ZoneDataTime of Destination Location
*/
public static ZonedDateTime toDestinationTimeZone(final LocalDateTime dateTime, final ZoneId origin,
final ZoneId destination) {
return toDestinationTimeZone(dateTime.atZone(origin), destination);
}
/**
* Convert Original LocalDateTime to Destination ZonedDatetime
* @param dateTime LocalDateTime of Original Location
* @param originShortZoneId Original Location ShortZoneId
* @param destinationShortZoneId Destination Location ShortZoneId
* @return ZoneDataTime of Destination Location
*/
public static ZonedDateTime toDestinationTimeZone(final LocalDateTime dateTime, ShortZoneId originShortZoneId,
ShortZoneId destinationShortZoneId) {
return toDestinationTimeZone(dateTime.atZone(ZoneId.of(ZoneId.SHORT_IDS.get(originShortZoneId.toString()))),
ZoneId.SHORT_IDS.get(destinationShortZoneId.toString()));
}
/**
* Convert Original LocalDateTime to Destination ZonedDatetime
* @param dateTime LocalDateTime of Original Location
* @param origin Original Location ZoneId (String)
* @param destination Destination ZoneId (String)
* @return ZoneDataTime of Destination Location
*/
public static ZonedDateTime toDestinationTimeZone(final LocalDateTime dateTime, final String origin,
final String destination) {
return toDestinationTimeZone(dateTime, ZoneId.of(origin), ZoneId.of(destination));
}
/**
* Convert Original DateTime String to Destination ZonedDatetime
* @param dateTime LocalDateTime of Original Location
* @param format Datetime Pattern Format (String)
* @param origin Original Location ZoneId (String)
* @param destination Destination ZoneId (String)
* @return ZoneDataTime of Destination Location
*/
public static ZonedDateTime toDestinationTimeZone(final String dateTime, final String format,
final String origin, final String destination) {
LocalDateTime originDatetime = LocalDateTime.parse(dateTime, DateTimeFormatter.ofPattern(format));
return toDestinationTimeZone(originDatetime, origin, destination);
}
/**
* Convert Original ZonedDatetime to Destination LocalDateTime
* @param dateTime ZoneDateTime of Original Location
* @param destination Destination ZoneId (String)
* @return LocalDateTime of Destination Location
*/
public static LocalDateTime toDestinationTime(final ZonedDateTime dateTime, final String destination) {
return toDestinationTimeZone(dateTime, destination).toLocalDateTime();
}
/**
* Convert Original LocalDateTime to Destination LocalDateTime
* @param dateTime LocalDateTime of Original Location
* @param origin Original Location ZoneId (String)
* @param destination Destination ZoneId (String)
* @return LocalDateTime of Destination Location
*/
public static LocalDateTime toDestinationTime(final LocalDateTime dateTime, final String origin,
final String destination) {
return toDestinationTimeZone(dateTime, origin, destination).toLocalDateTime();
}
/**
* Convert Original LocalDateTime to Destination LocalDateTime
* @param dateTime LocalDateTime of Original Location
* @param origin Original Location ZoneId
* @param destination Destination ZoneId
* @return LocalDateTime of Destination Location
*/
public static LocalDateTime toDestinationTime(final LocalDateTime dateTime, final ZoneId origin,
final ZoneId destination) {
return toDestinationTimeZone(dateTime, origin, destination).toLocalDateTime();
}
/**
* Convert Original LocalDateTime to Destination LocalDateTime
* @param dateTime LocalDateTime of Original Location
* @param originShortZoneId Original Location ShortZoneId
* @param destinationShortZoneId Destination ShortZoneId
* @return LocalDateTime of Destination Location
*/
public static LocalDateTime toDestinationTime(final LocalDateTime dateTime, ShortZoneId originShortZoneId,
ShortZoneId destinationShortZoneId) {
return toDestinationTimeZone(dateTime, originShortZoneId, destinationShortZoneId).toLocalDateTime();
}
/**
* Convert Original DateTime String to Destination LocalDateTime
* @param dateTime Original Location Datetime (String)
* @param format Datetime Pattern Format (String)
* @param origin Original Location ZoneId (String)
* @param destination Destination ZoneId (String)
* @return LocalDateTime of Destination Location
*/
public static LocalDateTime toDestinationTime(final String dateTime, final String format,
final String origin, final String destination) {
return toDestinationTimeZone(dateTime, format, origin, destination).toLocalDateTime();
}
/**
* Convert Original DateTime String to Destination DateTime String
* @param dateTime Original Location Datetime (String)
* @param format Datetime Pattern Format (String)
* @param originShortZoneId Original Location ShortZoneId
* @param destinationShortZoneId Destination ShortZoneId
* @return Destination Datetime (String)
*/
public static String toDestinationTimeString(final String dateTime, final String format,
ShortZoneId originShortZoneId, ShortZoneId destinationShortZoneId) {
return toDestinationTime(LocalDateTime
.parse(dateTime, DateTimeFormatter.ofPattern(format)), originShortZoneId, destinationShortZoneId)
.format(DateTimeFormatter.ofPattern(format));
}
/**
* Convert Original DateTime String to Destination DateTime String
* @param dateTime Original Location Datetime (String)
* @param format Datetime Pattern Format (String)
* @param origin Original Location ZoneId (String)
* @param destination Destination ZoneId (String)
* @return Destination Datetime (String)
*/
public static String toDestinationTimeString(final String dateTime, final String format,
final String origin, final String destination) {
return toDestinationTime(dateTime, format, origin, destination).format(DateTimeFormatter.ofPattern(format));
}
/**
* Convert DateTime String to Destination Epoch Second
* @param dateTime Origin Local Datetime
* @param origin Origin ZoneId
* @return Epoch Second (Long)
*/
public static Long toEpochTime(final LocalDateTime dateTime, final ZoneId origin) {
return dateTime.atZone(origin).toEpochSecond();
}
/**
* Convert DateTime String to Destination Epoch Second
* @param dateTime Origin Local Datetime (String)
* @param format Datetime Pattern Format (String)
* @param origin origin Origin ZoneId (String)
* @return Epoch Second (Long)
*/
public static Long toEpochTime(final String dateTime, final String format, final String origin) {
return toEpochTime(LocalDateTime.parse(dateTime,
DateTimeFormatter.ofPattern(format)), ZoneId.of(origin));
}
/**
* Convert Epoch Second Time to Destination LocalDatetime
* @param epochSecond Epoch Second (Long)
* @param destination Destination ZoneId
* @return Destination (LocalDatetime)
*/
public static LocalDateTime convertFromEpochTime(final Long epochSecond, final ZoneId destination) {
return LocalDateTime.ofInstant(Instant.ofEpochSecond(epochSecond), destination);
}
/**
* Convert Epoch Second Time to Destination LocalDatetime
* @param epochSecond Epoch Second (Long)
* @param destination Destination ZoneId (String)
* @return Destination (LocalDatetime)
*/
public static LocalDateTime convertFromEpochTime(final Long epochSecond, final String destination) {
return convertFromEpochTime(epochSecond, ZoneId.of(destination));
}
/**
* Convert Epoch Second Time to Destination LocalDatetime
* @param epochSecond Epoch Second (Long)
* @param destination Destination ZoneId (String)
* @param format Datetime Pattern Format (String)
* @return Destination (LocalDatetime)
*/
public static String convertFromEpochTime(final Long epochSecond, final ZoneId destination, final String format) {
return convertFromEpochTime(epochSecond, destination).format(DateTimeFormatter.ofPattern(format));
}
private static void printTimeZoneInfo() {
getTypicalTimeZoneIdWithName().forEach((k, v) -> System.out.println(k + " : " + v));
getAllTimeZoneIdWithOffset().forEach((k, v) -> System.out.println(k + " : " + v));
System.out.println(getTimeZoneIdByOffset("UTC +08:00"));
}
// Test Driver
public static void main(String[] args) {
String dateInString1 = "2018-09-30 20:30:40";
LocalDateTime localDateTime1 = LocalDateTime.now();
ZonedDateTime zonedDateTime1 = ZonedDateTime.now();
String zoneIdString0 = "+00:00";
String zoneIdName0 = "Greenwich";
String zoneIdString1 = "+08:00";
String zoneIdName1 = "Asia/Shanghai";
String zoneIdName2 = "America/Chicago";
ZonedDateTime destinationTimeZone = toDestinationTimeZone(localDateTime1, zoneIdName2, zoneIdName0);
System.out.println("-> To Time Zone: " + zoneIdName0 + " " + destinationTimeZone);
destinationTimeZone = toDestinationTimeZone(zonedDateTime1, ShortZoneId.PST);
System.out.println("-> To Time Zone: " + ShortZoneId.PST + " " + destinationTimeZone);
String destinationTimeString = toDestinationTimeString(dateInString1, DATE_TIME_FORMAT_WITH_SEC,
zoneIdName2, zoneIdName1);
System.out.println("-> To Static Time From Zone [" + zoneIdName2 + "] To Zone [" + zoneIdName1
+ "] : " + destinationTimeString);
destinationTimeString = toDestinationTimeString(dateInString1, DATE_TIME_FORMAT_WITH_SEC,
ShortZoneId.CST, ShortZoneId.PST);
System.out.println("\n-> Convert Static Time From CST to PST: " + " " + destinationTimeString);
Long destinationEpochTime = toEpochTime(localDateTime1, ZoneId.of(zoneIdName2));
System.out.println("\n-> To Epoch Time for Zone: " + zoneIdName2 + " " + destinationEpochTime);
LocalDateTime destinationTime = convertFromEpochTime(System.currentTimeMillis()/1000,
ZoneId.of(zoneIdName2));
System.out.println("Convert Current Epoch Second to [" + zoneIdName2 + "] : " + destinationTime);
String timeString = convertFromEpochTime(System.currentTimeMillis()/1000,
ZoneId.of(zoneIdName1), DATE_TIME_FORMAT_WITH_SEC);
System.out.println("Convert Current Epoch Second to [" + zoneIdName1 + "] : " + timeString);
}
}