TypeScript Date getHours()

In this chapter, we will explore the Date.getHours() method in TypeScript. This method returns the hour (from 0 to 23) of the specified date according to local time. Understanding how to use Date.getHours() is useful for extracting the hour from a date object.

Table of Contents

1. Definition
2. Syntax
3. Examples
4. Conclusion

1. Definition

The Date.getHours() method returns the hour (from 0 to 23) of the specified date according to local time.

2. Syntax

dateObj.getHours();

Parameters

The Date.getHours() method does not take any parameters.

Return Value

The method returns an integer number, between 0 and 23, representing the hour for the given date according to local time.

3. Examples

Let's look at some examples to understand how Date.getHours() works in TypeScript.

Example 1: Basic Usage

In this example, we use Date.getHours() to get the hour from a specific date.

let date = new Date('2024-07-15T10:20:30Z');
let hours = date.getHours();
console.log(hours); // Output: 10 (if in UTC timezone)

Example 2: Getting the Current Hour

In this example, we use Date.getHours() to get the current hour.

let now = new Date();
let currentHour = now.getHours();
console.log(currentHour); // Output: The current hour, e.g., 14

Example 3: Using Date.getHours() with Different Times

In this example, we use Date.getHours() to get the hour for different times.

let morning = new Date('2024-07-15T08:00:00');
let evening = new Date('2024-07-15T20:00:00');
console.log(morning.getHours()); // Output: 8
console.log(evening.getHours()); // Output: 20

Example 4: Using Date.getHours() with a Date Object

In this example, we use Date.getHours() with a date object created from the current date and time.

let date = new Date();
let hours = date.getHours();
console.log(hours); // Output: The current hour

Example 5: Using Date.getHours() with Past and Future Dates

In this example, we use Date.getHours() to get the hour for past and future dates.

let pastDate = new Date('2000-01-01T12:34:56');
let futureDate = new Date('2050-05-20T23:45:00');
console.log(pastDate.getHours()); // Output: 12
console.log(futureDate.getHours()); // Output: 23

Example 6: Using Date.getHours() in Different Time Zones

In this example, we use Date.getHours() to get the hour for a date object in different time zones.

let date = new Date('2024-07-15T10:20:30Z');
let hoursUTC = date.getUTCHours();
let hoursLocal = date.getHours();
console.log(hoursUTC);   // Output: 10
console.log(hoursLocal); // Output: Depends on the local time zone

4. Conclusion

In this chapter, we explored the Date.getHours() method in TypeScript, which is used to return the hour (from 0 to 23) of the specified date according to local time. We covered its definition, syntax, parameters, return value, and provided several examples to demonstrate its usage. Understanding how to use Date.getHours() effectively can help in various scenarios where extracting the hour from a date object is required.