java日期函数工具类

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

import java.util.GregorianCalendar;

 

public class DateTimeUtil {

public static String getDateStr(String pattern,Date date){

SimpleDateFormat df = new SimpleDateFormat(pattern);

return df.format(date);

}

public static Date getDateFromStr(String pattern,String dateStr)throws Exception{

if(dateStr == null){

return null;

}

SimpleDateFormat df = new SimpleDateFormat(pattern);

return df.parse(dateStr);

}

public static Date addYear(Date date,int amount){

Calendar cal = new GregorianCalendar();

cal.setTime(date);

cal.add(Calendar.YEAR, amount);

return cal.getTime();

}

public static Date addMonth(Date date,int amount){

Calendar cal = new GregorianCalendar();

cal.setTime(date);

cal.add(Calendar.MONTH, amount);

return cal.getTime();

}

public static Date addDate(Date date,int amount){

Calendar cal = new GregorianCalendar();

cal.setTime(date);

cal.add(Calendar.DATE, amount);

return cal.getTime();

}

public static Date addHour(Date date,int amount){

Calendar cal = new GregorianCalendar();

cal.setTime(date);

cal.add(Calendar.HOUR, amount);

return cal.getTime();

}

public static Date addMinute(Date date,int amount){

Calendar cal = new GregorianCalendar();

cal.setTime(date);

cal.add(Calendar.MINUTE, amount);

return cal.getTime();

}

}