Operations Clock (github hosted webpage)
This clock was originally developed for the National Hurricane Center in 2004, and has become popular in operations centers, especially in FEMA and the National Weather Service.
To launch the clock, either launch locally or via a webserver one of these html files. For best appearance, full screen the browser. Make sure the computer running the web browser has a system clock in sync with the atomic clock.
One popular complete clock solution is to set up a raspberry pi connected to a monitor and boot it into a full screen browser with this clock. See pi instructions for example.
- utc-lcl.html (preferred)
- zulu.html
- universal.html
- local.html
- universal-local.html
- countdown.html
index.html points to utc-lcl.html as the preferred clock, but any of the other clocks can be used.
The utc-lcl clock can be customized with your specific local timezone in the bottom left using the settings.js file. Samples are provided for eastern and central timezones in the settings.js file and under config directory. Currently only local tz images available for EST, EDT, CST, CDT. More images can be made for other timezones.
The countdown clock can be configured either:
- With a date in the settings.js file. See sample in settings file or under config
- With a URL argument "target":
countdown.html?target=2026-01-01T00:00:00-07:00(example for New Years in the Mountain Standard Time Zone, UTC-7)