Summary - Date and time

Combine Date, Intl and setTimeout to write a timer.

Summary - Date and time

In this group you learned Node.js's date and time tools: the Date object, getUTCDate/getUTCMonth methods, localization with Intl.DateTimeFormat, high-resolution measurement with performance.now, and setTimeout/setInterval timers. Now we will combine them in a timer.

Structure: show the UTC date localized with Intl.DateTimeFormat, and use setTimeout to print a message after a delay. This is a small example of combining date display and a scheduled task in a real app. Even with a 0 ms delay the timer runs after sync code, so the output order is deterministic.

Exercise Write a localized date and timer

Define const date = new Date("2024-03-15T00:00:00Z");. Create const fmt = new Intl.DateTimeFormat("tr-TR", { day: "numeric", month: "long", year: "numeric", timeZone: "UTC" });. Print the date with console.log(fmt.format(date)). Set a timer with setTimeout(() => console.log("Timer done"), 0);.

Show example solution

const date = new Date("2024-03-15T00:00:00Z");
const fmt = new Intl.DateTimeFormat("tr-TR", { day: "numeric", month: "long", year: "numeric", timeZone: "UTC" });
console.log(fmt.format(date));
setTimeout(() => console.log("Timer done"), 0);

Test yourself

What is the best way to show a date in Turkish format?
```
new Intl.DateTimeFormat("tr-TR", ...)
```
- Intl.DateTimeFormat("tr-TR", ...) kullanmak
- Building an array of month names by hand
- Date.toString() kullanmak
- performance.now() kullanmak
Show answer

Intl.DateTimeFormat("tr-TR", ...) kullanmak — Intl.DateTimeFormat does localized formatting.
Match each tool to its purpose

Date

Date object
getUTCMonth

Month component
Intl.DateTimeFormat

Localized formatting
setTimeout

Delayed call

Complete the DateTimeFormat call

const fmt = new Intl.____("tr-TR", { day: "numeric", month: "long", year: "numeric", timeZone: "UTC" });

Show answer

const fmt = new Intl.DateTimeFormat("tr-TR", { day: "numeric", month: "long", year: "numeric", timeZone: "UTC" });

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