Java Time Zone Transition Period From EDT To EST?

Oct 28, 2014

Problem statement: Convert "2014-11-02 01:00:15 EST" to GMT.

This seems easy enough. But why is the below code giving the wrong answer?

Background:

* EDT aka GMT-4

* EST aka GMT-5

* 2014-11-02 01:00:15 EST == 2014-11-02 06:00:15 GMT

* If I user the commented out date string it works!!!

* EDT(until Nov 2, 2014 at 2am) -> at 2am we go to 1am EST

* If I use the below commented out from string it work!!! But these are equal (2014-11-02 01:00:15 GMT-05:00 and "2014-11-02 01:00:15 EST)

Code Example:

ZoneId gmt = ZoneId.of("GMT");
//String from = "2014-11-02 01:00:15 GMT-05:00";
String from = "2014-11-02 01:00:15 EST";
final DateTimeFormatter dateTimeFormatterone = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss z");
ZnedDateTime zonedDateTime = ZonedDateTime.parse(from, dateTimeFormatterone);
ZonedDateTime gmtzonedDateTime = zonedDateTime.withZoneSameInstant(gmt);
String result = gmtzonedDateTime.format(dateTimeFormatterone);

This is what the outcome is.

result == "2014-11-02 05:00:15 GMT"

Shouldn't it be

result == "2014-11-02 06:00:15 GMT"

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