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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 

export function now() {

  return Date.now() * 1000

}



export function local_offset() {

  const date = new Date()

  return -1 * date.getTimezoneOffset()

}



export function monotonic_now() {

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

}



export function to_parts(timestamp) {

  const date = new Date(timestamp / 1000)

  return [

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

    [date.getUTCHours(), date.getUTCMinutes(), date.getUTCSeconds()],

  ]

}



export function from_parts(parts, offset) {

  const date = new Date()

  date.setUTCFullYear(parts[0][0])

  date.setUTCMonth(parts[0][1] - 1)

  date.setUTCDate(parts[0][2])

  date.setUTCHours(parts[1][0])

  date.setUTCMinutes(parts[1][1])

  date.setUTCSeconds(parts[1][2])

  return date.getTime() * 1000 - offset

}



export function weekday(timestamp, offset) {

  const date = new Date((timestamp - offset) / 1000)

  return date.getDay()

}



// export function to_iso(timestamp) {

//   const date = new Date(timestamp / 1000)

//   return date.toISOString()

// }



// export function from_iso(iso_date) {

//   const date = new Date(iso_date)

//   if (isNaN(date)) return new Error(Nil)

//   return date.getTime() * 1000

// }