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https://issues.apache.org/jira/browse/DERBY-7091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17233816#comment-17233816
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Richard N. Hillegas commented on DERBY-7091:
--------------------------------------------
In a derby-dev email thread titled "[jira] [Commented] (DERBY-7091) Times
Inserted Incorrectly Around Daylight Savings Time Change in Spring", Anurag
Shekhar points out that summer time kicked in at 2017-03-12 02:00:00. That is
the exact moment when the clocks jumped forward. Technically, 2017-03-12
02:00:00 and 2017-03-12 02:48:00.000 are non-existent times. The standard
notation for those instants are 2017-03-12 03:00:00.000 and 2017-03-12
03:48:00.000 respectively:
http://apache-database.10148.n7.nabble.com/jira-Commented-DERBY-7091-Times-Inserted-Incorrectly-Around-Daylight-Savings-Time-Change-in-Spring-td151535.html
Hope this makes sense,
-Rick
> Times Inserted Incorrectly Around Daylight Savings Time Change in Spring
> ------------------------------------------------------------------------
>
> Key: DERBY-7091
> URL: https://issues.apache.org/jira/browse/DERBY-7091
> Project: Derby
> Issue Type: Bug
> Affects Versions: 10.14.2.0
> Environment: Java 14.0.1
> Reporter: Larry Melvin Lemons
> Priority: Critical
> Attachments: Test.java, Timezone_Data_Inconsistencies.odt
>
>
> When inserting date/times into the timestamp field around the daylight
> savings time change in the Spring, the times are inconsistent. I am in/use
> the New York EST/EDT timezone, but the data I am inserting is Standard time
> and not Daylight Savings Time
> All the times are correct up to 1:48AM, then when it inserts 2:00 AM the data
> in the database is 3:00AM. That could be alright if it kept switching the
> time to Daylight Savings Time, however going from inserting 2:48AM and
> getting 3:48AM in the database, when it inserts 3:00AM it shows 3:00AM in the
> database, not the expected 4:00AM. Then in the fall whatever is inserted in
> the database is what shows in the database around the daylight savings time
> switch to standard time. See the attached Open Document Text file for
> examples of what is actually inserted and what is showing in the database.
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