JAVA时间格式，没有那么死板，可以自由组合。你想怎样就怎样，随便你控制。

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;public class DateFormatExamples {public static void main(String[] args) {LocalDateTime now = LocalDateTime.now();System.out.println("ISO_LOCAL_DATE_TIME: " + now.format(DateTimeFormatter.ISO_LOCAL_DATE_TIME));System.out.println("ISO_LOCAL_DATE: " + now.format(DateTimeFormatter.ISO_LOCAL_DATE));System.out.println("ISO_LOCAL_TIME: " + now.format(DateTimeFormatter.ISO_LOCAL_TIME));// 自定义格式,可以换成yyyyMM-dd HH:mm:ss，也可以换成yyyy-MM-dd HHmmss，随你喜欢DateTimeFormatter customFormat = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");System.out.println("随你便: " + now.format(customFormat));DateTimeFormatter dateOnly = DateTimeFormatter.ofPattern("dd/MM/yyyy");LocalDate today = LocalDate.now();System.out.println("日期部分: " + today.format(dateOnly));DateTimeFormatter timeOnly = DateTimeFormatter.ofPattern("hh:mm a");LocalTime currentTime = LocalTime.now();System.out.println("取后头 " + currentTime.format(timeOnly));System.out.println("MMddyyyy: " + now.format(DateTimeFormatter.ofPattern("MMddyyyy")));System.out.println("MM/dd/yyyy HH:mm:ss: " + now.format(DateTimeFormatter.ofPattern("MM/dd/yyyy HH:mm:ss")));System.out.println("KK:mm a: " + now.format(DateTimeFormatter.ofPattern("KK:mm a")));System.out.println("yyyy年MM月dd日: " + now.format(DateTimeFormatter.ofPattern("yyyy年MM月dd日")));System.out.println("yyyy.MM.dd 公元: " + now.format(DateTimeFormatter.ofPattern("yyyy.MM.dd G")));System.out.println("星期几: " + now.format(DateTimeFormatter.ofPattern("EEEE")));System.out.println("yyyyy.MMMMM.dd GGG hh:mm: " + now.format(DateTimeFormatter.ofPattern("yyyyy.MMMMM.dd GGG hh:mm")));}
}

输出结果是：

ISO_LOCAL_DATE_TIME: 2024-06-23T11:01:10.104
ISO_LOCAL_DATE: 2024-06-23
ISO_LOCAL_TIME: 11:01:10.104
随你便: 2024-06-23 11:01:10
日期部分: 23/06/2024
取后头 11:01 上午
MMddyyyy: 06232024
MM/dd/yyyy HH:mm:ss: 06/23/2024 11:01:10
KK:mm a: 11:01 上午
yyyy年MM月dd日: 2024年06月23日
yyyy.MM.dd 公元: 2024.06.23 公元
星期几: 星期日
yyyyy.MMMMM.dd GGG hh:mm: 02024.6.23 公元 11:01