DateTimeFormat in TypeScript

Question

I want to display a time string in 24 hour format and thought it would be easy in TypeScript. But I can't use the Date.toLocaleTimeString() with options for some reason. Any idea why? They are defined in a separate interface definition.

interface Date {     toLocaleString(locales?: string[], options?: Intl.DateTimeFormatOptions): string;     toLocaleString(locale?: string, options?: Intl.DateTimeFormatOptions): string; } 

The other option is to use Intl.DateTimeFormat but the constructors return a Collator?

var DateTimeFormat: {     new (locales?: string[], options?: DateTimeFormatOptions): Collator;     new (locale?: string, options?: DateTimeFormatOptions): Collator;     (locales?: string[], options?: DateTimeFormatOptions): Collator; 

Is it a copy paste bug in lib.d.ts (same for NumberFormat) or how am I supposed to use them?

Hopefully it's an easy fix, I'm pretty new to TypeScript so I might have missed something.

Answer 1

This should work...

var displayDate = new Date().toLocaleDateString();  alert(displayDate); 

But I suspect you are trying it on something else, for example:

var displayDate = Date.now.toLocaleDateString(); // No!  alert(displayDate);