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manifold
Manifold is a Java compiler plugin, its features include Metaprogramming, Properties, Extension Methods, Operator Overloading, Templates, a Preprocessor, and more.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Check out the manifold project. https://github.com/manifold-systems/manifold
In the meantime you might want to check out JavaCPP: https://github.com/bytedeco/javacpp
.NET's DateTime isn't amazing, it's true, but I think there's been some small improvements in that area recently. If you need something more robust, you can always reach for Noda Time.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.