rusty_time-core

Portable NTPv4 protocol and clock-discipline algorithms.

This crate knows bytes, timestamps and estimates. It performs no I/O, reads no OS clock, and holds no product types — a developer who has never heard of the rest of the workspace can drive it, and it compiles for wasm32 unchanged.

• ntp — RFC 5905 packet codec, extension fields (RFC 7822), timestamp arithmetic.
• filter — the sample register and a weighted linear regression that measures frequency directly, rather than inferring it through a PLL time constant.
• select — falseticker rejection by interval intersection.
• discipline — turns estimates into clock commands (step, slew, drain budget).
• client — SyncController, the loop the daemon and the simulator both run.
• server — client table, token-bucket rate limiting, Kiss-o'-Death, interleaved mode.

Sign convention throughout: an offset is the number of seconds to add to the local clock to match the source (RFC 5905 theta). Positive offset means the local clock is behind.

Part of rusty_time

rusty_time is chrony, remade with Rust: a pure-Rust NTPv4 + NTS time client and server for Linux, macOS, Windows and wasm, with no C toolchain anywhere in the build.

Performance claims live in corpus/LEDGER.md with the run that produced them. Anything not in the ledger is not claimed.

Licence

MIT OR Apache-2.0.