Command line app to query an NTP server, to verify your OS clock setting.
zig build -Dexe [--release=[safe|small|fast]]
# build and run, debug: zig build -Dexe run
# library tests: zig build testCurrently targets just SNTP (RFC4330). src/ntp.zig can be used independently in other projects; it is exposed via this project's build.zig and build.zig.zon files. Other dependencies of the binary are lazy, i.e. they won't be fetched if you use only the library in another project.
Usage: ntp_client [options]
Options:
-s, --server NTP server to query (default: pool.ntp.org)
-p, --port UDP port to use for NTP query (default: 123)
-v, --protocol-version NTP protocol version, 3 or 4 (default: 4)
-a, --all Query all IP addresses found for a given server URL (default: false / stop after first)
--src-ip IP address to use for sending the query (default: 0.0.0.0 / auto-select)
--src-port UDP port to use for sending the query (default: 0 / any port)
-z, --timezone Timezone to use in results display (default: UTC)
-j, --json Print result as JSON
-h, --help Show this help and exitzig build run -Dexe -- -z local---***---
Server name: "pool.ntp.org"
Server address: "178.63.52.31:123"
---
LI=0 VN=4 Mode=4 Stratum=2 Poll=0 (0 s) Precision=-24 (59 ns)
ID: 0xDE03BC83
Server root dispersion: 30914 us, root delay: 8392 us
---
Server last synced : 2024-07-09T08:54:05.515336464+02:00
T1, packet created : 2024-07-09T09:06:56.690365786+02:00
T2, server received : 2024-07-09T09:06:56.697508476+02:00
T3, server replied : 2024-07-09T09:06:56.697553604+02:00
T4, reply received : 2024-07-09T09:06:56.700540800+02:00
(timezone displayed: Europe/Berlin)
---
Offset to timserver: 0.002 s (2077 us)
Round-trip delay: 0.010 s (10129 us)
---***---
Developed & tested on Linux (Debian, on an x86 machine). Windows worked last time I tested (build.zig links libc for this), Mac OS might work (can't test this).
This package is developed with Zig 0.14.0-dev (master), might not compile with older versions. As of 2024-06-15, Zig-0.12 and Zig-0.13 (both stable) should work.
- flags for command line argument parsing
- zdt to display timestamps as UTC or timezone-local datetimes
MIT. See the LICENSE file in the root directory of the repository.