Java Convert LocalDate to ZonedDateTime – Java 147

Post author:若雪
Post published:2023-10-12
Post category:RD / Java / Java Conversion / Java Conversion Datetime
Post comments:0 Comments
Post last modified:2023-10-14

Table of Contents

Java Convert LocalDate to ZonedDateTime

將 LocalDate 轉換為 ZonedDateTime，在日期後附加時區信息，轉換步驟如下： 1. 取得時區，以便可以將時區資訊附加到日期，2. 調用 atStartOfDay 以便可以將時間附加到日期， Java LocalDate ZonedDateTime 任務是將該 LocalDate 轉換為 ZonedDateTime ，本篇增加了範例，並透過單元測試來驗證產出結果。

檔案目錄

./
   +- src
       +- test
       |   +- org
       |       +- ruoxue
       |           +- java_147
       |               +- conversion
       |                   +- datetime
       |                       +- LocalDateToZonedDateTimeTest.java

單元測試

Java LocalDate to ZonedDateTime 提供 LocalDate 轉換成 ZonedDateTime 等操作。

atStartOfDay

Java LocalDate to ZonedDateTime 使用 atStartOfDay 轉換成 ZonedDateTime 。

	@Test
	public void atStartOfDay() {
		LocalDate localDate = LocalDate.of(2023, 4, 4);
		System.out.println(localDate);
		ZoneId zone = ZoneId.of("Asia/Sakhalin");
		ZonedDateTime result = localDate.atStartOfDay(zone);
		System.out.println(result);
		assertEquals("2023-04-04T00:00+11:00[Asia/Sakhalin]", result.toString());

		localDate = LocalDate.parse("2023-04-04");
		System.out.println(localDate);
		result = localDate.atStartOfDay(zone);
		System.out.println(result);
		assertEquals("2023-04-04T00:00+11:00[Asia/Sakhalin]", result.toString());
	}

2023-04-04
2023-04-04T00:00+11:00[Asia/Sakhalin]
2023-04-04
2023-04-04T00:00+11:00[Asia/Sakhalin]

atZone

Java LocalDate to ZonedDateTime 使用 atZone 轉換成 ZonedDateTime 。

	@Test
	public void atZone() {
		LocalDate localDate = LocalDate.of(2023, 4, 4);
		System.out.println(localDate);
		LocalDateTime localDateTime = localDate.atTime(0, 0, 0);
		ZoneId zone = ZoneId.of("Asia/Sakhalin");
		ZonedDateTime result = localDateTime.atZone(zone);
		System.out.println(result);
		assertEquals("2023-04-04T00:00+11:00[Asia/Sakhalin]", result.toString());

		localDate = LocalDate.parse("2023-04-04");
		System.out.println(localDate);
		result = localDateTime.atZone(zone);
		System.out.println(result);
		assertEquals("2023-04-04T00:00+11:00[Asia/Sakhalin]", result.toString());
	}

2023-04-04
2023-04-04T00:00+11:00[Asia/Sakhalin]
2023-04-04
2023-04-04T00:00+11:00[Asia/Sakhalin]

LocalDateToZonedDateTimeTest.java

Convert LocalDate to ZonedDateTime in Java 新增單元測試，驗證是否符合預期。

package org.ruoxue.java_147.conversion.datetime;

import static org.junit.Assert.assertEquals;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;

import org.junit.Test;

public class LocalDateToZonedDateTimeTest {

	@Test
	public void atStartOfDay() {
		LocalDate localDate = LocalDate.of(2023, 4, 4);
		System.out.println(localDate);
		ZoneId zone = ZoneId.of("Asia/Sakhalin");
		ZonedDateTime result = localDate.atStartOfDay(zone);
		System.out.println(result);
		assertEquals("2023-04-04T00:00+11:00[Asia/Sakhalin]", result.toString());

		localDate = LocalDate.parse("2023-04-04");
		System.out.println(localDate);
		result = localDate.atStartOfDay(zone);
		System.out.println(result);
		assertEquals("2023-04-04T00:00+11:00[Asia/Sakhalin]", result.toString());
	}

	@Test
	public void atZone() {
		LocalDate localDate = LocalDate.of(2023, 4, 4);
		System.out.println(localDate);
		LocalDateTime localDateTime = localDate.atTime(0, 0, 0);
		ZoneId zone = ZoneId.of("Asia/Sakhalin");
		ZonedDateTime result = localDateTime.atZone(zone);
		System.out.println(result);
		assertEquals("2023-04-04T00:00+11:00[Asia/Sakhalin]", result.toString());

		localDate = LocalDate.parse("2023-04-04");
		System.out.println(localDate);
		result = localDateTime.atZone(zone);
		System.out.println(result);
		assertEquals("2023-04-04T00:00+11:00[Asia/Sakhalin]", result.toString());
	}
}

心得分享

LocalDate to ZonedDateTime in Java 將 LocalDate 轉換為 ZonedDateTime 實例的方法，簡單來說過程如： LocalDate -> java.util.ZonedDateTime 這些步驟等， Convert LocalDate to ZonedDateTime in Java 提供將 LocalDate 實例轉換為 ZonedDateTime 實例的方法。