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Date / Time handling for Gleam

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birl src birl_ffi.mjs
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src/birl_ffi.mjs 

import { Some } from '../gleam_stdlib/gleam/option.mjs';



// FFI functions for features not available in gleam_time



export function local_timezone() {

  return new Some(Intl.DateTimeFormat().resolvedOptions().timeZone);

}



export function monotonic_now() {

  return Math.floor(globalThis.performance.now() * 1000);

}



export function weekday(timestamp, offset) {

  const date = new Date((timestamp + offset) / 1000);

  return date.getUTCDay();

}