If you are comparing a Timestamp from a remote server located in a different timezone with a local Timestamp, you need to convert either the remote Timestamp to a local one or vice versa.
//Firstly, create a ZonedDateTime representing the remote Timestamp
GregorianCalendar remoteCalendar = new GregorianCalendar(remoteTimeZone);
//Secondly, convert this remote ZonedDateTime to a local ZonedDateTime
ZonedDateTime remoteZonedResult;
You need to know your server's timezone id no matter which way you are going to convert. Let's say your server's timezone id is "America/New_York". (You can get all the available timezone ids by calling TimeZone.getAvailableIDs().)
1. Convert a remote Timestamp to a local ZonedDateTime
String remoteZoneId = "America/New_York";
TimeZone remoteTimeZone = TimeZone.getTimeZone(serverZoneId);
Timestamp remoteTimestamp = <the value to be converted>
//Firstly, create a ZonedDateTime representing the remote Timestamp
GregorianCalendar remoteCalendar = new GregorianCalendar(remoteTimeZone);
remoteCalendar.setTimeInMillis(remoteTimestamp.getTime());
ZonedDateTime remoteZDT = remoteCalendar.toZonedDateTime();
// ( OR use the following code to get the remote ZonedDateTime:
// Instant remoteInstant = Instant.ofEpochMilli(remoteTimestamp.getTime());
// ZonedDateTime remoteZDT = remoteInstant.atZone(remoteTimeZone.toZoneId());
// )
// ( OR use the following code to get the remote ZonedDateTime:
// Instant remoteInstant = Instant.ofEpochMilli(remoteTimestamp.getTime());
// ZonedDateTime remoteZDT = remoteInstant.atZone(remoteTimeZone.toZoneId());
// )
//Secondly, convert this remote ZonedDateTime to a local ZonedDateTime
TimeZone localTimeZone = TimeZone.getDefault();
ZonedDateTime remoteZonedResult;
if (remoteTimeZone.getRawOffset() == localTimeZone.getRawOffset()){
remoteZonedResult = remoteZDT;
} else {
remoteZonedResult = remoteZDT.withZoneSameInstant(localTimeZone.toZoneId());
}
2. Convert a local Timestamp to a local ZonedDateTime
Timestamp localTimeStamp = <your local time stamp>
TimeZone localTimeZone = TimeZone.getDefault();
ZonedDateTime localZonedResult = ZonedDateTime.of(localTimeStamp.toLocalDateTime(), localTimeZone.toZoneId());
3. Comparing
remoteZonedResult.isBefore(localZonedResult);
remoteZonedResult.isAfter(localZonedResult);
remoteZoneResult.equals(localZonedResult);
Of course, you can also convert the local Timestamp to a remote ZonedDateTime, and then comparing it with the remote ZonedDateTime representing a remote Timestamp.
Of course, you can also convert the local Timestamp to a remote ZonedDateTime, and then comparing it with the remote ZonedDateTime representing a remote Timestamp.
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