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https://issues.apache.org/jira/browse/GROOVY-8368?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jochen Theodorou closed GROOVY-8368.
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Resolution: Fixed
Assignee: Jochen Theodorou
> date arithmetic bug using TimeCategory intervals
> ------------------------------------------------
>
> Key: GROOVY-8368
> URL: https://issues.apache.org/jira/browse/GROOVY-8368
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 2.6.0-alpha-1
> Environment: Ubuntu 16.04, Groovy 2.6.0-alpha-1, OpenJDK 1.8.0_131
> Reporter: Brian Koehmstedt
> Assignee: Jochen Theodorou
> Priority: Minor
> Attachments: intervalBug.groovy
>
>
> There's what I think to be a date arithmetic bug using TimeCategory intervals
> and it appears to show itself only the 30th of any given month. I noticed
> this because our automatic builds fail towards the end of the month due to
> failing tests and this has been going on for a long time. I decided to hunt
> this down today (Oct 30) as the build failed today and I had time to track it
> down. I was able to produce a small script to reproduce it, as shown below.
> I tested with latest 2.6.0 alpha1 as well as 2.4.10 (what we're actually
> using). Both show the bug.
> I don't have an opinion on how "1.month" is interpreted in Groovy. That's
> not what this submission is about. The bug I am reporting here is that the
> following two expressions should always evaluate to the same value and it
> appears they don't on the 30th of the month:
> {code}
> Date now = new Date().clearTime()
> // fails on the 30th of the month (at least, for Oct 30 2017)
> assert now + 1.month + 1.day == now + 1.day + 1.month
> {code}
> {code}
> // START of intervalBug.groovy
> import groovy.time.TimeCategory
> Date now = new Date().clearTime()
> println "current date = $now"
> use(TimeCategory) {
> println "now+1day+1month = ${now + 1.day + 1.month}"
> println "now+1month+1day = ${now + 1.month + 1.day}"
> }
> // END of intervalBug.groovy
> {code}
> {noformat}
> # also tested with groovy-2.4.10 with same buggy result
> $ groovy -v
> Groovy Version: 2.6.0-alpha-1 JVM: 1.8.0_131 Vendor: Oracle Corporation OS:
> Linux
> # 29th of month is OK: same result produced
> $ sudo date -s "29 OCT 2017 13:00:00"; groovy intervalBug.groovy
> Sun Oct 29 13:00:00 PDT 2017
> current date = Sun Oct 29 00:00:00 PDT 2017
> now+1day+1month = Thu Nov 30 00:00:00 PST 2017
> now+1month+1day = Thu Nov 30 00:00:00 PST 2017
> # 30th of month is BUGGY: different result produced
> $ sudo date -s "30 OCT 2017 13:00:00"; groovy intervalBug.groovy
> Mon Oct 30 13:00:00 PDT 2017
> current date = Mon Oct 30 00:00:00 PDT 2017
> now+1day+1month = Thu Nov 30 00:00:00 PST 2017
> now+1month+1day = Fri Dec 01 00:00:00 PST 2017
> # 31st of month is OK
> $ sudo date -s "31 OCT 2017 13:00:00"; groovy intervalBug.groovy
> [sudo] password for bkoehmstedt:
> Tue Oct 31 13:00:00 PDT 2017
> current date = Tue Oct 31 00:00:00 PDT 2017
> now+1day+1month = Fri Dec 01 00:00:00 PST 2017
> now+1month+1day = Fri Dec 01 00:00:00 PST 2017
> # 1st of month is OK
> $ sudo date -s "01 NOV 2017 13:00:00"; groovy intervalBug.groovy
> [sudo] password for bkoehmstedt:
> Wed Nov 1 13:00:00 PDT 2017
> current date = Wed Nov 01 00:00:00 PDT 2017
> now+1day+1month = Sat Dec 02 00:00:00 PST 2017
> now+1month+1day = Sat Dec 02 00:00:00 PST 2017
> {noformat}
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