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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.

Practice 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);.

Starter code

index.js
// Define a UTC date
// write here

// Create a tr-TR formatter
// write here

// Print the date
// write here

// Print "Timer done"
// write here

Sample solution

index.js
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);

Expected output

15 Mart 2024
Zamanlayıcı tamam

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 What is the best way to show a date in Turkish format?

index.js
new Intl.DateTimeFormat("tr-TR", ...)
  • Intl.DateTimeFormat("tr-TR", ...) kullanmak Correct answer
  • Building an array of month names by hand
  • Date.toString() kullanmak
  • performance.now() kullanmak

Explanation: Intl.DateTimeFormat does localized formatting.

2 Match each tool to its purpose

Term Meaning
Date Date object
getUTCMonth Month component
Intl.DateTimeFormat Localized formatting
setTimeout Delayed call

3 Complete the DateTimeFormat call

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

Explanation: Intl.DateTimeFormat creates a local formatter.

All lessons in Intermediate

1 Events

  1. EventEmitter
  2. on and emit
  3. once
  4. removeListener
  5. error event
  6. Summary - Events

2 Streams

  1. What are streams?
  2. Readable stream
  3. Writable stream
  4. pipe
  5. Transform stream
  6. Summary - Streams

3 HTTP server

  1. http.createServer
  2. Request and response
  3. Routing
  4. JSON response
  5. Query string
  6. Summary - HTTP server

4 Project: Helper library

  1. Module design
  2. String helpers
  3. Number helpers
  4. Date helpers
  5. Putting it together

5 Express basics

  1. What is Express?
  2. express()
  3. app.get
  4. app.post
  5. app.listen
  6. Summary - Express basics

6 Middleware

  1. What is middleware?
  2. app.use
  3. Router middleware
  4. Error middleware
  5. Body parser
  6. Summary - Middleware

7 Routing

  1. Route parameters
  2. Query parameters
  3. express.Router
  4. Route groups
  5. Method chaining
  6. Summary - Routing

8 Project: Quiz app

  1. Quiz model
  2. Adding questions
  3. Running the quiz
  4. Score calculation
  5. Putting it together

9 Async patterns

  1. Async iteration
  2. Async generators
  3. Concurrency limit
  4. Retry pattern
  5. Debounce and throttle
  6. Summary - Async patterns

10 Buffer and binary

  1. What is Buffer?
  2. Buffer.from
  3. Buffer.concat
  4. toString and encoding
  5. Buffer slice
  6. Summary - Buffer

11 Process and CLI

  1. process.argv
  2. process.env
  3. process.exit
  4. process.stdin/stdout
  5. Child process
  6. Summary - Process

12 Project: Library API

  1. Model design
  2. Express app
  3. CRUD routes
  4. Middleware
  5. Putting it together

13 npm and packages

  1. npm install
  2. package.json scripts
  3. devDependencies
  4. Semver
  5. npm publish
  6. Summary - npm

14 Error handling

  1. The Error class
  2. try/catch
  3. Custom errors
  4. Error middleware
  5. Unhandled rejection
  6. Summary - Error handling

15 Testing basics

  1. node:test
  2. assert
  3. describe and it
  4. Before and after
  5. Mock
  6. Summary - Testing basics

16 Debugging

  1. node inspect
  2. Chrome DevTools
  3. console methods
  4. util.inspect
  5. Source maps
  6. Summary - Debugging

17 Date and time

  1. The Date object
  2. Date methods
  3. Intl.DateTimeFormat
  4. performance.now
  5. setTimeout and setInterval
  6. Summary - Date and time

18 Crypto

  1. crypto module
  2. createHash
  3. randomBytes
  4. HMAC
  5. AES
  6. Summary - Crypto

19 URL and query string

  1. URL object
  2. URLSearchParams
  3. URL properties
  4. URL.resolve
  5. querystring
  6. Summary - URL and query string

20 Intermediate final

  1. Project design
  2. Express API
  3. fs persistence
  4. Middleware
  5. Putting it together