At runtime, any code can call TimeZone.setDefault to change the timezone of the JVM.
I'd suggest logging TimeZone.getDefault().getDisplayName(Locale.ENGLISH); intermittently and seeing if some code somewhere is changing the timezone. Could be in any library... Paul On Wed, Jun 10, 2020 at 2:56 PM Stefan Mayr <ste...@mayr-stefan.de> wrote: > Hi, > > today I've seen something I don't understand: our developers reported an > application that was returning a non-GMT timezone in Date and > Last-Modified headers. > > $ curl -v http://localhost:8080 > * Rebuilt URL to: http://localhost:8080/ > * Trying 127.0.0.1... > * TCP_NODELAY set > * Connected to localhost (127.0.0.1) port 8080 (#0) > > GET / HTTP/1.1 > > Host: localhost:8080 > > User-Agent: curl/7.58.0 > > Accept: */* > > > < HTTP/1.1 200 > < X-Correlation-Id: 68ef1063-dbbb-4216-a3a7-2acdb768abbd > < Last-Modified: Tue, 12 May 2020 14:04:15 YEKT > < Accept-Ranges: bytes > < X-Content-Type-Options: nosniff > < X-XSS-Protection: 1; mode=block > < Cache-Control: no-cache, no-store, max-age=0, must-revalidate > < Pragma: no-cache > < Expires: 0 > < Strict-Transport-Security: max-age=31536000 > < X-Frame-Options: DENY > < Content-Type: text/html;charset=UTF-8 > < Content-Language: en-US > < Content-Length: 5409 > < Date: Wed, 10 Jun 2020 20:42:26 JST > ... > > There you can see Date with JST and Last-Modified with YEKT instead of GMT > > All other locales (LANG, LC_*, /etc/localtime) of this system are okay > and after a restart everything is correct again and I'm not able to > reproduce it > > $ curl -vs http://localhost:8080 2>&1|egrep -i "Date|Last-Modified" > * start date: Mar 25 10:50:00 2020 GMT > * expire date: Mar 30 23:59:59 2021 GMT > < cache-control: no-cache, no-store, max-age=0, must-revalidate > < date: Wed, 10 Jun 2020 11:52:42 GMT > < last-modified: Tue, 12 May 2020 09:04:15 GMT > > > This is a Spring Boot application with an embedded Tomcat (9.0.16) > running in a Cloud Foundry Container. > > Reading through the source code of > org.apache.tomcat.util.http.FastHttpDateFormat I don't understand how > this is even possible. > > Has anybody ever seen this or an idea what could have happened there? > After the restart I can't reproduce it. > > Thanks, > > Stefan > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > >
