隨記

Date

current time

ex

Date currentTime = new Date();  
System.out.println("currentTime: " + currentTime);

UNIX TimeStamp已考慮時區問題

ex

Date currentUnix = new Date();  
Long unix =currentUnix.getTime();

apache.commons.lang3 DateFormatUtils

public static String format(Date date,
                            String pattern,
                            TimeZone timeZone)
Formats a date/time into a specific pattern in a time zone.

Parameters:
date - the date to format, not null
pattern - the pattern to use to format the date, not null
timeZone - the time zone to use, may be null
Returns:
the formatted date

Fomatter用法

import java.time.format.DateTimeFormatter;  
DateTimeFormatter format = DateTimeFormatter.ofPattern("MMM d yyyy hh:mm a");  
DateTimeFormatter format1 = DateTimeFormatter.ofPattern("yyyy-MM-dd hh:mm:ss");  
DateTimeFormatter format2 = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");  
String dateString = "2022-12-19 19:30";  
localDateTime.format(format);  
LocalDateTime formatDateTime = LocalDateTime.parse(dateString, format2);

-------------------------------------------------------------;

LocalDateTime

LocalDateTime

LocalDateTime currentTime = LocalDateTime.now();  
ex: 2022-02-14T09:52:14.406 (本機本地時間)

--------------------------------------------------------;

ZonedDateTime

取得有時區的時間

ZonedDateTime date1 = ZonedDateTime.parse("2007-12-03T10:15:30+05:30[Asia/Taipei]");  
ex: 2022-12-03T10:15:30+08:00[Asia/Taipei]  

ZoneId id = ZoneId.of("Asia/Taipei");  
//取得ZoneId

-------------------------------------------------------------; Date 轉其他型別

Date currcurrentDateentUnix = new Date();  
Instant current = currentDate.toInstant();  
ZoneId myZone = ZoneId.of("Asia/Taipei");  
轉LocalDateTime和ZonedDateTime類別
LocalDateTime localDateTime = LocalDateTime.ofInstant(current, myZone);  
ZonedDateTime zonedDateTime = ZonedDateTime.ofInstant(current, myZone);