DateFormat df = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss ");
System.out.println(df.format(new Date()));
String time =df.format(new Date());
DateFormat df = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss ");
String currenttime =df.format(new Date());
Timestamp createtime = Timestamp.valueOf(currenttime);
Date time = new Date();
int createtime = (int) time.getTime();
用DateFormat.getDateInstance().format(new Date());转换成如2008-05-04 09:48:17.687的日期格式就可以进行相减了。
package com.enation.framework.util;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
* 日期相关的操作
* @author Dawei
*
*/
public class DateUtil {
/**
* 将一个字符串转换成日期格式
* @param date
* @param pattern
* @return
*/
public static Date toDate(String date, String pattern) {
if((""+date).equals("")){
return null;
}
if(pattern == null){
pattern = "yyyy-MM-dd";
}
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
Date newDate = new Date();
try {
newDate = sdf.parse(date);
} catch (Exception ex) {
ex.printStackTrace();
}
return newDate;
}
/**
* 把日期转换成字符串型
* @param date
* @param pattern
* @return
*/
public static String toString(Date date, String pattern){
if(date == null){
return "";
}
if(pattern == null){
pattern = "yyyy-MM-dd";
}
String dateString = "";
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
try {
dateString = sdf.format(date);
} catch (Exception ex) {
ex.printStackTrace();
}
return dateString;
}
/**
* 获取上个月的开始结束时间
* @return
*/
public static String[] getLastMonth() {
// 取得系统当前时间
Calendar cal = Calendar.getInstance();
int year = cal.get(Calendar.YEAR);
int month = cal.get(Calendar.MONTH) + 1;
// 取得系统当前时间所在月第一天时间对象
cal.set(Calendar.DAY_OF_MONTH, 1);
// 日期减一,取得上月最后一天时间对象
cal.add(Calendar.DAY_OF_MONTH, -1);
// 输出上月最后一天日期
int day = cal.get(Calendar.DAY_OF_MONTH);
String months = "";
String days = "";
if (month > 1) {
month--;
} else {
year--;
month = 12;
}
if (!(String.valueOf(month).length() > 1)) {
months = "0" + month;
} else {
months = String.valueOf(month);
}
if (!(String.valueOf(day).length() > 1)) {
days = "0" + day;
} else {
days = String.valueOf(day);
}
String firstDay = "" + year + "-" + months + "-01";
String lastDay = "" + year + "-" + months + "-" + days;
String[] lastMonth = new String[2];
lastMonth[0] = firstDay;
lastMonth[1] = lastDay;
// System.out.println(lastMonth[0] + "||" + lastMonth[1]);
return lastMonth;
}
/**
* 获取当月的开始结束时间
* @return
*/
public static String[] getCurrentMonth() {
// 取得系统当前时间
Calendar cal = Calendar.getInstance();
int year = cal.get(Calendar.YEAR);
int month = cal.get(Calendar.MONTH)+1 ;
// 取得系统当前时间所在月第一天时间对象
cal.set(Calendar.DAY_OF_MONTH, 1);
// 日期减一,取得上月最后一天时间对象
cal.add(Calendar.DAY_OF_MONTH, -1);
// 输出上月最后一天日期
int day = cal.get(Calendar.DAY_OF_MONTH);
String months = "";
String days = "";
if (!(String.valueOf(month).length() > 1)) {
months = "0" + month;
} else {
months = String.valueOf(month);
}
if (!(String.valueOf(day).length() > 1)) {
days = "0" + day;
} else {
days = String.valueOf(day);
}
String firstDay = "" + year + "-" + months + "-01";
String lastDay = "" + year + "-" + months + "-" + days;
String[] currentMonth = new String[2];
currentMonth[0] = firstDay;
currentMonth[1] = lastDay;
// System.out.println(lastMonth[0] + "||" + lastMonth[1]);
return currentMonth;
}
public static int getDateline(){
return (int)(System.currentTimeMillis()/1000);
}
public static int getDateline(String date){
return (int)(toDate(date, "yyyy-MM-dd").getTime()/1000);
}
}