tz.js/examples.js

var XTZ;

(function () {
  "use strict";

  if (!XTZ) {
    try {
      XTZ = require("xtz");
    } catch (e) {
      XTZ = require("./xtz.js");
    }
  }

  var TZ = XTZ;
  var tzDate;

  //
  // UTC-absolute time translated to a Time Zone
  //
  function demo1() {
    console.info("What's the UTC equivalent of 8:15am in New York?");
    console.info();

    console.info("\t// during daylight savings");
    console.info(`\tXTZ.toUTC("2021-03-14 08:15:59.000", "America/New_York")`);
    console.info(`\ttzDate.toISOString()`);
    tzDate = XTZ.toUTC("2021-03-14 08:15:59.000", "America/New_York");
    console.info(
      "\t" + tzDate.toISOString(),
      "// same as",
      new Date(tzDate.toISOString()).toISOString()
    );
    console.info();

    console.info("\t// during standard time");
    console.info(`\tXTZ.toUTC("2021-11-07 08:15:59.000", "America/New_York")`);
    console.info(`\ttzDate.toISOString()`);
    tzDate = XTZ.toUTC("2021-11-07 08:15:59.000", "America/New_York");
    console.info(
      "\t" + tzDate.toISOString(),
      "// same as",
      new Date(tzDate.toISOString()).toISOString()
    );
    console.info();
  }

  //
  // Time Zone-relative time translated to UTC
  //
  function demo2() {
    console.info("What time is it in New York at 8:15am on March 14th UTC?");
    console.info();

    console.info("\t// during daylight savings");
    console.info(
      `\tXTZ.toTimeZone("2021-03-14T08:15:59.000Z", "America/New_York")`
    );
    console.info(`\ttzDate.toISOString()`);
    tzDate = XTZ.toTimeZone("2021-03-14T08:15:59.000Z", "America/New_York");
    console.info(
      "\t" + tzDate.toISOString(),
      "// same as",
      new Date(tzDate.toISOString()).toISOString()
    );
    console.info();

    console.info("\t// during standard time");
    console.info(`\tXTZ.toUTC("2021-11-07T08:15:59.000Z", "America/New_York")`);
    console.info(`\ttzDate.toISOString()`);
    tzDate = XTZ.toUTC("2021-11-07T08:15:59.000Z", "America/New_York");
    console.info(
      "\t" + tzDate.toISOString(),
      "// same as",
      new Date(tzDate.toISOString()).toISOString()
    );
    console.info();
  }

  demo1();
  demo2();
})();