• ITU - Internet Time Utility - https://github.com/ethlo/itu
• Google HTTP client - com.google.api.client.util.DateTime
• Standard JDK - java.time.OffsetDateTime

Your mileage may vary. I've done my best to make sure these tests are as accurate as possible, but please do your own evaluation.

JMH result file - Visualize JMH

Tests performed on a Lenovo P1 G6 laptop:

• Intel(R) Core(TM) i9-13900H
• Ubuntu 23.10
• OpenJDK version 17.0.9

mvn jmh:benchmark

To group the results and create the result file, you can run plot.py, for example:

python3 plot.py