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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.
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Joplin
Joplin - the secure note taking and to-do app with synchronisation capabilities for Windows, macOS, Linux, Android and iOS.
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github-orgmode-tests
This is a test project where you can explore how github interprets Org-mode files
In that case, you might like Zim. It's a desktop wiki tool, that writes flat text files in folders (if you use note nesting), using markdown (plus buttons for formatting if you prefer). You can configure it to default new notes to include date, and I think a calandar selector is used for something, but I've only used it for cross-referenced things, such as cookbooks or loading TTRPGs/settings together.
I think jrnl may be exactly what you're looking for. You can do quick entries directly from the command line or have it open your favorite text editor. It handles encryption, date and time stamps, tags, etc. I used it for a long time before I decided to switch back to old-fashioned pen and paper. As for syncing, I'd recommend syncthing, which is amazing in general.
did you mean this?