Moment Timezone

IANA Time Zone Database + Moment.js.

var june = moment("2014-06-01T12:00:00Z");
june.tz('America/Los_Angeles').format('ha z'); // 5am PDT
june.tz('America/New_York').format('ha z');    // 8am EDT
june.tz('Asia/Tokyo').format('ha z');          // 9pm JST
june.tz('Australia/Sydney').format('ha z');    // 10pm EST

var dec = moment("2014-12-01T12:00:00Z");
dec.tz('America/Los_Angeles').format('ha z');  // 4am PST
dec.tz('America/New_York').format('ha z');     // 7am EST
dec.tz('Asia/Tokyo').format('ha z');           // 9pm JST
dec.tz('Australia/Sydney').format('ha z');     // 11pm EST

Use Node.js 22.12+ and npm for development. Runtime exports accept both CommonJS Moment and a webpack-style default export. JSHint's minimatch/lodash and the Nodeunit TAP reporter use patched dependency overrides.

Run npm ci --ignore-scripts, npx grunt jshint nodeunit:core, and npm audit. The full npm test also checks historical timezone guesses from 2018 against bundled 2019a data: on 2026-09-13, 73 of 1,426,324 zone assertions fail identically in the pre-update baseline and the refreshed version. Core tests pass. Timezone data has not been refreshed by this dependency update.