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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';



export function now() {

  return Date.now() * 1000;

}



export function local_offset() {

  const date = new Date();

  return -date.getTimezoneOffset();

}



export function local_timezone() {

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

}



export function monotonic_now() {

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

}



export function to_parts(timestamp, offset) {

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

  return [

    [date.getUTCFullYear(), date.getUTCMonth() + 1, date.getUTCDate()],

    [

      date.getUTCHours(),

      date.getUTCMinutes(),

      date.getUTCSeconds(),

      date.getUTCMilliseconds(),

    ],

  ];

}



export function from_parts(parts, offset) {

  const date = new Date(

    Date.UTC(

      parts[0][0],

      parts[0][1] - 1,

      parts[0][2],

      parts[1][0],

      parts[1][1],

      parts[1][2],

      parts[1][3]

    )

  );



  return date.getTime() * 1000 - offset;

}



export function weekday(timestamp, offset) {

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

  return date.getUTCDay();

}