@vvo/tzdb/dist/utils/timeZone.js.map

Always up to date list of time zones, with grouping and major cities

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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\n\nconst ianaRegex =\n  /^[A-Za-z_+-]{1,256}(:?\\/[A-Za-z_+-]{1,256}(\\/[A-Za-z_+-]{1,256})?)?$/;\n\nconst typeToPos = {\n  year: 0,\n  month: 1,\n  day: 2,\n  hour: 3,\n  minute: 4,\n  second: 5,\n};\n\nfunction isValidIanaSpecifier(s) {\n  return !!(s && s.match(ianaRegex));\n}\n\nfunction hackyOffset(dtf, date) {\n  const formatted = dtf.format(date).replace(/\\u200E/g, \"\");\n  const parsed = /(\\d+)\\/(\\d+)\\/(\\d+),? (\\d+):(\\d+):(\\d+)/.exec(formatted);\n  const [, fMonth, fDay, fYear, fHour, fMinute, fSecond] = parsed;\n  return [fYear, fMonth, fDay, fHour, fMinute, fSecond];\n}\n\nfunction partsOffset(dtf, date) {\n  const formatted = dtf.formatToParts(date);\n  const filled = [];\n  for (let i = 0; i < formatted.length; i++) {\n    const { type, value } = formatted[i];\n    const pos = typeToPos[type];\n\n    if (typeof pos !== \"undefined\") {\n      filled[pos] = parseInt(value, 10);\n    }\n  }\n  return filled;\n}\n\nfunction makeDTF(zone) {\n  return new Intl.DateTimeFormat(\"en-US\", {\n    hourCycle: \"h23\",\n    timeZone: zone,\n    year: \"numeric\",\n    month: \"2-digit\",\n    day: \"2-digit\",\n    hour: \"2-digit\",\n    minute: \"2-digit\",\n    second: \"2-digit\",\n  });\n}\n\n// covert a calendar object to a local timestamp (epoch, but with the offset baked in)\nfunction objToLocalTS(obj) {\n  let d = Date.UTC(\n    obj.year,\n    obj.month - 1,\n    obj.day,\n    obj.hour,\n    obj.minute,\n    obj.second,\n    obj.millisecond,\n  );\n\n  // for legacy reasons, years between 0 and 99 are interpreted as 19XX; revert that\n  if (obj.year < 100 && obj.year >= 0) {\n    d = new Date(d);\n    d.setUTCFullYear(d.getUTCFullYear() - 1900);\n  }\n  return +d;\n}\n\nexport function getZoneOffset(timeZoneName) {\n  if (!isValidIanaSpecifier(timeZoneName)) {\n    return false;\n  }\n\n  const date = new Date(Date.now());\n\n  let dtf;\n\n  try {\n    dtf = makeDTF(timeZoneName);\n  } catch (_) {\n    return false;\n  }\n\n  const [year, month, day, hour, minute, second] = dtf.formatToParts\n    ? partsOffset(dtf, date)\n    : hackyOffset(dtf, date);\n\n  const asUTC = objToLocalTS({\n    year,\n    month,\n    day,\n    hour,\n    minute,\n    second,\n    millisecond: 0,\n  });\n\n  let asTS = +date;\n  const over = asTS % 1000;\n  asTS -= over >= 0 ? over : 1000 + over;\n  return (asUTC - asTS) / (60 * 1000);\n}\n"],"file":"timeZone.js"}