The problem is that the source system took the pure date value, but added time at midnight, then converted that to UTC, but you want the pure date value in a java.util.Date
, which by default prints in your local time zone, i.e. the JVM's default time zone.
So, you have to parse the string, revert the value back to the time zone of the source system, the treat that local time as a time in your own JVM's default time zone.
You can do that like this, showing all the intermediate types:
String sourceStr = "2020-01-11T23:00:00.000Z";
ZoneId sourceTimeZone = ZoneOffset.ofHours(1); // Use real zone of source, e.g. ZoneId.of("Europe/Paris");
// Parse Zulu date string as zoned date/time in source time zone
Instant sourceInstant = Instant.parse(sourceStr);
ZonedDateTime sourceZoned = sourceInstant.atZone(sourceTimeZone);
// Convert to util.Date in local time zone
ZonedDateTime localZoned = sourceZoned.withZoneSameLocal(ZoneId.systemDefault());
Instant localInstant = localZoned.toInstant();
Date localDate = Date.from(localInstant); // <== This is your desired result
// Print value in ISO 8601 format
String localStr = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS").format(localDate);
System.out.println(localStr);
Output
2020-01-12T00:00:00.000
The code can of course be merged together:
String input = "2020-01-11T23:00:00.000Z";
Date date = Date.from(Instant.parse(input).atZone(ZoneOffset.ofHours(1))
.withZoneSameLocal(ZoneId.systemDefault()).toInstant());
System.out.println(date);
Output
Sun Jan 12 00:00:00 EST 2020
As you can see, the date value is correct, even though I'm in the US Eastern time zone.
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