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();}}
