How to use Java to get the start and end time of the day

Preface

In Java development, handling dates and times is a common task. Especially when processing data, it is very important to obtain the start and end times of a specific date. This blog will explain how to use JavaLocalDateandLocalDateTimeClass to get the start time (00:00:00) and end time (23:59:59) of a certain day.

1. Java Date Time API Overview

Java 8 introduces a new datetime API (package) to better handle dates and times. Compared to the old oneandClass, new API is easier to use and thread safe. We will use the following two classes:

• LocalDate: Indicates a date (year, month, and date) without time zone.
• LocalDateTime: Indicates a date (year, month, day, hour, minute, and second) without a time zone.

2. Get the start and end time of the day

We will write a simple Java program to get the start and end times of the specified date. Here is a code example:

import ;
import ;
import ;
import ;

public class DateExample {
    public static void main(String[] args) {
        // Specify date        LocalDate date = (2024, 10, 24);

        // Get the start time of the day        LocalDateTime startOfDay = ();
        // Get the end time of the day        LocalDateTime endOfDay = (); // 23:59:59.999999999

        // Format output        DateTimeFormatter formatter = ("yyyy-MM-dd HH:mm:ss");
        ("Start time: " + (formatter));
        ("End time: " + (formatter));
    }
}

Code parsing

• Specified date:use(2024, 10, 24)A date object representing October 24, 2024 was created.

• Get the start time: CalledatStartOfDay()Method, return the start time of the date (i.e. 00:00:00).

• Get the end time: CalledatTime()Get the end time of the day, which represents 23:59:59.9999999999. You can use it as needed(23, 59, 59)To get the simple 23:59:59 format.

• Format output:useDateTimeFormatterFormat date and time into strings for easy printing output.

Running results

After running the above code, you will see the following output:

Start time: 2024-10-24 00:00:00
End time: 2024-10-24 23:59:59

3. Summary

This article describes how to use Java 8's new datetime API to get the start and end times of a specified date. useLocalDateandLocalDateTimeClasses, developers can handle dates and times more easily, avoiding many troubles caused by old APIs.

In this way, you can accurately handle date-related requirements in actual development, whether in database queries, data statistics or time-frame comparisons, which are very useful tips.

This is the article about how to use Java to obtain the start and end time of the day. For more related content on Java to obtain the start and end time of the day, please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!