Fast, CLI world clock that displays time zone information using tz database to read valid tz entries.
$ gotwc -h -f tools/samples/tz-small.conf
America/New_York 2023-12-11 12:37:13
America/Los_Angeles 2023-12-11 09:37:13
UTC 2023-12-11 17:37:13
Europe/London 2023-12-11 17:37:13
Europe/Paris 2023-12-11 18:37:13
Asia/Tokyo 2023-12-12 02:37:13
Australia/Sydney 2023-12-12 04:37:13- 🚀 Fast - 10X times faster than
twc.cand 65X times faster thandate.1
Only ≈7 msfor one entry, and ≈177 msfor ≈ 600 entries. - 🔒 Robust - tested to work with all tz database entries,
version 2023c. - 📦 Self-contained - zero dependencies,
lightweight (
110 lines,2458 bytes).
If you are building gotwc, you'll need:
- A Go compiler
If you have Homebrew installed, just run:
brew install Neved4/homebrew-tap/gotwcAlternatively, clone the repository:
git clone https://github.com/Neved4/gotwcThen build:
go buildThe following usage and options are available:
gotwc [-h] [-f path] [-s format] [-t timezone] ...
Options:
-f path
Read config from path (default "$HOME/.config/twc/tz.conf")
-h
Print in human-readable format
-s format
Set desired time format (e.g. "%Y-%m-%d")
-t timezone
specific timezone (e.g. "Asia/Tokyo")
Examples:
Print Tokyo's date in a human-readable format with YY-MM-DD format:
$ gotwc -h -s %Y-%m-%d -t Asia/Tokyo
Asia/Tokyo 2024-01-02 15:04:05
Print date in Los Angeles using an environment variable for the timezone:
$ TZ=America/Los_Angeles gotwc
2024-01-02T15:04:05-0800
Environment:
XDG_CONFIG_HOME
When defined, it will be used to store the tz.conf file.
TZ
Timezone to use when displaying dates.
Files:
~/.config/twc/tz.conf
Stores tz database entries to be displayed.
See also:
environ(7)
To compile the binary inside a Docker image, run:
docker build .Runs on Linux, macOS and *BSD systems on both
x86_64 and arm64.
gotwc should run on most POSIX.1-20172 compatible systems and
produce ISO 86013 output.
gotwc is licensed under the terms of the MIT License.
See the LICENSE file for details.
- oz/tz - awesome cli time zone helper
- tzdiff - cli timezone diff
- Neved4/twc - tiny world clock in C
Footnotes
-
cfr.
datecommand takes ≈931 mswhen iterating over ≈ 600 entries. Measured withhyperfine. ↩ -
IEEE Std 1003.1-2017: Standard for Information Technology — Portable Operating System Interface (POSIX®),
ISO/IEC/IEEE 9945:2009/COR 2:2017. URL: https://pubs.opengroup.org/onlinepubs/9699919799/ ↩ -
ISO 8601: Date and time \ — Representations for information interchange, ISO 8601-1:2019.
URL: https://www.iso.org/obp/ui/#iso:std:iso:8601:-2:ed-1:v1:en ↩