public class DateUtil {
/**
* get today
* for example: 2013-08-13
* @return
*
*/
public static String getToday() {
Date now = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String today = sdf.format(now);
return today;
}
/**
* get Current month
* @return
*/
public static String getCurrenMonth() {
Date now = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
String month = sdf.format(now);
return month;
}
/**
* get Current month
* @return
*/
public static String getCurrenWeek() {
Date now = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("w");
String month = sdf.format(now);
return month;
}
public static String getCurrenYear() {
Date now = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy");
String year = sdf.format(now);
return year;
}
/**
* get the now time
* for example: 2013-08-28 09:48:04
* @return
*/
public static String getNow() {
Date now = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String today = sdf.format(now);
return today;
}
/**
* get the Date from today i days
* @param i
* @return
*/
public static String getDateFromNow(int i) {
Date date = new Date();//取时间
Calendar calendar = new GregorianCalendar();
calendar.setTime(date);
calendar.add(Calendar.DATE, i);//把日期往后增加一天.整数往后推,负数往前移动
date = calendar.getTime(); //这个时间就是日期往后推一天的结果
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
String dateString = formatter.format(date);
return dateString;
}
// public static void main(String args[]){
// System.out.println(DateUtil.getDateFromNow(2));
// System.out.println(DateUtil.getToday());
// }
/**
* 取得当月天数
* */
public static int getCurrentMonthLastDay()
{
Calendar a = Calendar.getInstance();
a.set(Calendar.DATE, 1);//把日期设置为当月第一天
a.roll(Calendar.DATE, -1);//日期回滚一天，也就是最后一天
int maxDate = a.get(Calendar.DATE);
return maxDate;
}
/**
* 得到指定月的天数
* */
public static int getMonthLastDay(int year, int month)
{
Calendar a = Calendar.getInstance();
a.set(Calendar.YEAR, year);
a.set(Calendar.MONTH, month - 1);
a.set(Calendar.DATE, 1);//把日期设置为当月第一天
a.roll(Calendar.DATE, -1);//日期回滚一天，也就是最后一天
int maxDate = a.get(Calendar.DATE);
return maxDate;
}
}