The Date object in JavaScript is the main element when it comes to handling date and time. It records a single point in time as the milliseconds’ number elapsed since the 1st January 1970 00:00: ...

Step 3. Obtain the current UTC time, by adding the local time zone offset to the local time. // obtain UTC time in msec utc = localTime + localOffset; ...

But as a JavaScript developer, you would know this theory doesn't hold long after you start working with dates for real. On top of different date-time formats, you have to consider timezone and ...