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Here is how to calculate difference, in minutes, between UTC and local time

You can even check for functions:

Find the nearest ancestor:

This one is important to know... Arrays are internally represented as objects in JavaScript.

I like this one. Great for very simple tests in console.

If you want to "deep copy" the object, that's the way to go:

Interfaces and enums are one of the best features you can find in TypeScript. Interfaces let you define contracts for objects, functions, and classes. This means the compiler catches errors early if you use an object incorrectly.

You can also use Template Literals with Tagged Templates for custom formatting: