Actually Java has nowadays nanosecond precision in java.time.Instant, and later Java versions have more than millisecond precision there.
https://stackoverflow.com/questions/59632635/create-actual-date-in-string-format-from-microseconds-with-precision-of-microsec -Harri -----Original Message----- From: Mark Thomas <ma...@apache.org> Sent: perjantai 12. syyskuuta 2025 13.46 To: users@tomcat.apache.org Subject: Re: Support for microsecond precision in timestamps (Tomcat 9.0.108 / 10.1.44) On 12/09/2025 09:02, Poojashree Prakash wrote: > Hello, > > I am working with Tomcat 9.0.108 and 10.1.44 and trying to configure > my logging to include timestamps with microsecond precision. > > I have configured the pattern to use - > %{yyyy-MM-dd'T'HH:mm:ss.SSSSSS'Z'}t Where in the docs suggests that that will work? "S" is millisecond so "SSSSSS" is going to do strange things. > However, when I look at the logs, I notice that the values in the > microsecond portion appear to be dummy/filler values rather than true > microseconds: > > {"time":"2025-09-12T05:53:05.*000*655ZUTC"} > {"time":"2025-09-12T05:53:05.*000*675ZUTC"} See above. > Does Tomcat (9.0.x or 10.1.x) currently support real microsecond > precision in access logs or log4j2 output, or are these values > truncated/padded from millisecond resolution? You can have request processing time in nanoseconds if you want (see ExtendedAccessLogValve) but not absolute time. > If not supported, is there a recommended approach or an upcoming plan > to enable true microsecond precision in timestamps for Tomcat logs? Given that Java can't return the current time in anything more precise than milliseconds I don't see how microsecond precision could be realistically implemented. Mark --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
