How to Convert a UTC Epoch to a Local Date Effectively?

Convert UTC Epoch to Local Date Effectively

In a quest to transform UTC epochs to date objects, a common challenge arises when the assumption is made that the epoch provided is local. To address this issue, a more efficient approach can be employed.

The Solution

Instead of converting the UTC epoch to a UTC date and then adjusting it to the local time zone, the solution lies in setting the initial date to the epoch and adding UTC units. For instance, consider a UTC epoch in seconds, such as 1234567890:

var utcSeconds = 1234567890;
var d = new Date(0); // Sets the date to the epoch
d.setUTCSeconds(utcSeconds);

By utilizing this technique, the resulting date object, d, will accurately reflect the local time zone and provide the desired conversion from UTC epoch to local date.

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