JavaScript/Dates/Exercises

1. You can show the offset between your timezone and UTC by using getTimezoneOffset(). Show this offset.

Click to see solution

"use strict";
const ts_1 = new Date();
alert(ts_1.getTimezoneOffset());

2. Show the offset again, but don't use getTimezoneOffset(). Instead, work with Date.now() and Date.UTC().

Click to see solution

"use strict";

// Use an arbitrary timestamp, i.e., the first second of our century.
// a) in your timezone
const ts_2 = new Date(2000, 0, 1);
alert('Numerical value: ' + ts_2.valueOf());
alert(new Date(ts_2));

// b) in UTC
const ts_3 = Date.UTC(2000, 0, 1);
alert('Numerical value: ' + ts_3.valueOf());
alert(new Date(ts_3));

// the difference
const minutes = (ts_2 - ts_3) / 60000;
alert(minutes);