Date date = new Date();
// 可以打印當前日期時間
System.out.println(date.toString()); // 控制臺輸出 Thu Jan 05 18:41:11 CST 2023

// 常用的格式化
String pattern1 = "yyyy-MM-dd HH:mm:ss";
SimpleDateFormat sdf1 = new SimpleDateFormat(pattern1);
System.out.println(sdf1.format(date3)); // 輸出 2023-01-05 18:19:50
String pattern2 = "yyyy年MM月dd日 HH時mm分ss秒";
SimpleDateFormat sdf2 = new SimpleDateFormat(pattern2);
System.out.println(sdf2.format(date3)); // 輸出 2023年01月05日 18時19分50秒

String input = "2023-01-01 00:00:01";
String pattern1 = "yyyy-MM-dd HH:mm:ss";
SimpleDateFormat sdf3 = new SimpleDateFormat(pattern1);
try {
    // 將 String 類型的日期解析成 Date 類型的日期
    Date parsed = sdf3.parse(input);
    System.out.println(parsed);
} catch (ParseException e) {
    e.printStackTrace();
}

Calendar calendar = Calendar.getInstance();

calendar.set(Calendar.YEAR, 2023);          // 設置年份為2023
calendar.set(Calendar.MONTH, Calendar.MAY); // 設置月份為5（從0開始，5表示六月）
calendar.set(Calendar.DAY_OF_MONTH, 16);    // 設置日期為16號

calendar.add(Calendar.DAY_OF_MONTH, 7); // 增加7天

LocalDate now = LocalDate.now(); 			// 獲取當前日期
LocalDate date = LocalDate.of(2023, 5, 15); // 創(chuàng)建指定日期
LocalDate parsedDate = LocalDate.parse("2023-05-15"); // 解析日期
int year = date.getYear(); 			// 獲取年份
int month = date.getMonthValue(); 	// 獲取月份
int day = date.getDayOfMonth(); 	// 獲取日期

LocalTime time = LocalTime.now(); 					// 獲取當前時間
LocalTime specificTime = LocalTime.of(14, 30, 0); 	// 創(chuàng)建指定時間
LocalTime parsedTime = LocalTime.parse("14:30:00"); // 解析時間
int hour = time.getHour(); 		// 獲取小時
int minute = time.getMinute(); 	// 獲取分鐘
int second = time.getSecond(); 	// 獲取秒

LocalDateTime dateTime = LocalDateTime.now(); 								// 獲取當前日期和時間
LocalDateTime specificDateTime = LocalDateTime.of(2023, 5, 15, 14, 30); 	// 創(chuàng)建指定日期和時間
LocalDateTime parsedDateTime = LocalDateTime.parse("2023-05-15T14:30:00"); 	// 解析日期和時間，字母'T'用于分隔日期部分和時間部分。它的作用是明確表示日期和時間的分界線。

ZoneId zone = ZoneId.of("America/New_York"); 			// 創(chuàng)建時區(qū)
ZonedDateTime zonedDateTime = ZonedDateTime.now(zone); 	// 獲取帶有時區(qū)的當前日期和時間

LocalDateTime start = LocalDateTime.of(2023, 9, 8, 11, 0);
LocalDateTime end = LocalDateTime.of(2023, 9, 8, 11, 30);
Duration duration = Duration.between(start, end); 	// 計算兩個時間點之間的時間差
long minutes = duration.toMinutes(); 				// 獲取分鐘數(shù)

LocalDate startDate = LocalDate.of(2023, 9, 1);
LocalDate endDate = LocalDate.of(2023, 9, 8);
Period period = Period.between(startDate, endDate); // 計算兩個日期之間的時間差
int days = period.getDays(); 						// 獲取天數(shù)

LocalDateTime dateTime = LocalDateTime.now();
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
String formattedDateTime = dateTime.format(formatter); // 格式化為字符串
LocalDateTime parsedDateTime = LocalDateTime.parse("2023-05-15 14:30:00", formatter); // 解析字符串為日期和時間

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.13.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.13.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.13.4.2</version>
</dependency>

public class A {
    @JsonFormat(pattern = "yyyy年MM月", timezone = "GMT+8")
    @DateTimeFormat(pattern = "yyyy年MM月")
    private Date startTime;
    @JsonFormat(pattern = "yyyy年MM月", timezone = "GMT+8")
    @DateTimeFormat(pattern = "yyyy年MM月")
    private Date endTime;
}
public class B {
    @JsonFormat(pattern = "yyyy-MM-dd", timezone = "GMT+8")
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    private Date startTime;
    @JsonFormat(pattern = "yyyy-MM-dd", timezone = "GMT+8")
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    private Date endTime;
}