2SE_专题_日期处理/日期处理_4

鱼欲遇雨：每日都学习一点，持之以恒，天道酬勤！不能用电脑时，提前补上！（2012.9.16）

 

 

Agenda(议程，日常工作事项）
1   What is UTC/UT?
2   What is GMT?
3   How to get the current time?
4   How to format it?
5   How to convert a string to a date/time?
6   How to process the date / time with database?

Here's the answer:
1   java.lang.System
2   java.util.Date
3   java.util.Calendar
4   java.util.GregorianCalendar
5   java.util.TimeZone
6   java.text.DateFormat
7   java.text.SimpleDateFormat
8   java.sql.Date
9   java.sql.Time
10   java.sql.Timestamp

 

// TestDateTime.java

import java.sql.Timestamp;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;


public class TestDateTime {
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		//System.out.println(System.currentTimeMillis());
		System.currentTimeMillis();
		Date d = new Date();
		Calendar c = Calendar.getInstance();
		
		String s = "1970-09-14 08:24:37";
		Timestamp ts = Timestamp.valueOf(s);
		System.out.println(ts);
		
		Calendar cJapan = new GregorianCalendar(TimeZone.getTimeZone("Japan"));
		System.out.println(cJapan.get(Calendar.HOUR_OF_DAY));
		
		for(String str : TimeZone.getAvailableIDs()) {
			System.out.println(str);
		}

	}

}