import java.util.*;
import java.text.SimpleDateFormat;
import java.sql.Date;
import java.sql.Time;
import java.sql.Timestamp;
public class TestDateTime
{
public static void main(String[] argv)
{
long nCurrentTime = System.currentTimeMillis();
java.util.Date utilDate = new java.util.Date(nCurrentTime);
//以下是用于數(shù)據(jù)庫(kù)操作的日期和時(shí)間類(lèi)
java.sql.Date sqlDate = new java.sql.Date(utilDate.getTime());
//java.util.Date和java.sql.Date的轉(zhuǎn)換
java.sql.Time sqlTime = new java.sql.Time(utilDate.getTime());
java.sql.Timestamp sqlTimestamp = new java.sql.Timestamp(nCurrentTime);
//Calendar用于獲取指定的時(shí)間項(xiàng)（字段）
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(nCurrentTime);
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH) + 1; //注意：返回的月份是基于0的！
int day = calendar.get(Calendar.DAY_OF_MONTH);
int hour = calendar.get(Calendar.HOUR_OF_DAY);
int minute = calendar.get(Calendar.MINUTE);
int second = calendar.get(Calendar.SECOND);
System.out.println("Current date is: " + year + "年" + month + "月" + day + "日");
System.out.println("Current time is: " + hour + "時(shí)" + minute + "分" + second + "秒");
//SimpleDateFormat用于格式化日期和時(shí)間
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String szDatetime1 = df.format(utilDate);
System.out.println("Current datetime is: " + szDatetime1);
//以下計(jì)算兩個(gè)日期值之間相差的時(shí)間
java.util.Date date2 = new java.util.Date(nCurrentTime - 24600 * 1000);
long nMilliSeconds = utilDate.getTime() - date2.getTime();
long nSeconds = nMilliSeconds / 1000; //把毫秒換算成秒
double nDays = nSeconds / (24d * 60d * 60d); //把秒換算成天
String szDatetime2 = df.format(date2);
System.out.println("Time between " + szDatetime1 + " and " + szDatetime2 + " is " + nSeconds + " seconds (" + nDays + " days)");
}
}
程序運(yùn)行結(jié)果：
C:\java>java TestDateTime
Current date is: 2005年1月2日
Current time is: 15時(shí)55分45秒
Current datetime is: 2005-01-02 15:55:45
Time between 2005-01-02 15:55:45 and 2005-01-02 09:05:45 is 24600 seconds (0.2847222222222222 days)
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