Java: Get month Integer from Date

Problem Statement

Extracting month integers from date objects is a basic skill for developers. This is because you may encounter tasks like generating monthly reports, filtering dates by month, and scheduling events. In this article, we will try to familiarize ourselves with Java's powerful date and time API.

Prerequisites

Let's dive right into the Java task at hand, making sure you consider the following points. Make sure you are familiar with the basic Java syntax, especially the date and time API. You will use syntaxes such as java.util.Date, java.util.Calendar and modern java.time packages (recently introduced in Java 8).

Project structure

If you choose to use a Java IDE (such as Eclipse), your project structure should look like this.

<code>src/
├── main/
│ ├── java/
│ │ └── com/example/monthinteger/
│ │ ├── DateUtils.java
│ │ ├── Main.java
│ └── resources/
│ └── application.properties</code>

Let's now look at two possible ways you can extract month integers from dates; use the Calendar and LocalDate class methods.

Use Calendar class

The

Calendar class method is one of the most common ways to extract month integers from dates. The following tips will dig into how to execute Java code.

• The first step is to use the Date function to create and get the current time.
• You can then use the Calendar.getInstance() function to create a Calendar instance.
• The next step is to use the Date object to set the setTime() function. Calendar
Finally, you can use
• to retrieve month integers. It should be noted that the indexed month is based on 0, which means January = 0, and you can get the 1-based month value by adding 1. get(Calendar.MONTH)

Example

The following is a complete Java code block for getting month integers from dates using the Calendar class.

import java.util.Calendar;
import java.util.Date;

public class MonthExtractionExample {
   public static void main(String[] args) {
      Date currentDate = new Date();

      Calendar calendar = Calendar.getInstance();
      calendar.setTime(currentDate);

      int month = calendar.get(Calendar.MONTH);
      System.out.println("月份整数: " + (month + 1));
   }
}

Output

<code>月份整数: 9</code>

The following is a snippet of the appearance of the Calendar class after the compilation process.

Use LocalDate class

The following tips provide a guide on how to extract month integers from the current date using the LocalDate class.

Use the
• function to create a LocalDate.of() object to represent the current date. LocalDate After that, it's very simple, you just need to use the
class to retrieve the month integer. This method provides an efficient way to directly return a month value based on 1.
• getMonthValue()
Example

This is the complete block of code that you can paste into the Java IDE to retrieve the month integer from the current date.

import java.time.LocalDate;

public class GetMonthFromDate {
   public static void main(String[] args) {
      // 创建 LocalDate 实例
      LocalDate date = LocalDate.of(2024, 9, 9);

      // 获取月份整数
      int month = date.getMonthValue();

      // 打印月份
      System.out.println("月份是: " + month);
   }
}

Output

You should get an output screen similar to the illustration below to confirm that you use the above Java code to get month integers from dates.

<code>月份是: 9</code>

How to choose the ideal method

Both of the above codes provide an effective way to extract month integers from dates. On the one hand, the Calendar class method provides a more traditional way to extract month integers from dates. The LocalDate class method provides a modern method for getting month integers. The best guide to follow is to use the LocalDate method if you are using Java 8 and later, and the Calendar method if you are using an older version of Java.

Summary!

The above covers two common methods of extracting month integers from dates. Both Java month integer acquisition methods are easier to port to your project. If you want to try both methods before deciding on the ideal method, use Java 8 and later.

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