public class Test { /** * @param args */ public static void main(String[] args) {
SimpleDateFormat form = new SimpleDateFormat("yyyy-MM-dd"); Calendar ca = Calendar.getInstance(); Date today = new Date(); String todayConvert = form.format(today); ca.set(Calendar.YEAR, Integer.parseInt(todayConvert.substring(0, 4))); ca.set(Calendar.MONTH, Integer.parseInt(todayConvert.substring(5, 7))); ca.set(Calendar.DAY_OF_MONTH, 0); System.out.println("The last day of month:" + form.format(ca.getTime())); }結果:The last day of month:2012-02-29
public static void main(String[] args) throws ParseException {
String str = "2012-02-18"; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Date date = sdf.parse(str); Calendar cal = Calendar.getInstance(); cal.setTime(date);
public static void getTime(Date date) {
if(date == null) date=new Date();
Calendar calendar=Calendar.getInstance();
calendar.setTime(date);
int dow=calendar.get(Calendar.DAY_OF_WEEK);
if(dow==7) dow=0;
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
//本周最小日期
calendar.add(Calendar.DAY_OF_YEAR, -dow);
String strDate=sdf.format(calendar.getTime());
System.out.println(strDate);
// 本周最大日期
calendar.add(Calendar.DAY_OF_YEAR, 6);
strDate=sdf.format(calendar.getTime());
System.out.println(strDate);
}
* @param args
*/
public static void main(String[] args) {
SimpleDateFormat form = new SimpleDateFormat("yyyy-MM-dd");
Calendar ca = Calendar.getInstance();
Date today = new Date();
String todayConvert = form.format(today);
ca.set(Calendar.YEAR, Integer.parseInt(todayConvert.substring(0, 4)));
ca.set(Calendar.MONTH, Integer.parseInt(todayConvert.substring(5, 7)));
ca.set(Calendar.DAY_OF_MONTH, 0);
System.out.println("The last day of month:" + form.format(ca.getTime()));
}結果:The last day of month:2012-02-29
String str = "2012-02-18";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date date = sdf.parse(str);
Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.set(Calendar.DAY_OF_WEEK, 1);
System.out.println("本周开始日期:"+sdf.format(cal.getTime()));
cal.set(Calendar.DAY_OF_WEEK, 7);
System.out.println("本周结束日期:"+sdf.format(cal.getTime()));
cal.set(Calendar.DAY_OF_MONTH, 1);
System.out.println("本月开始日期:"+sdf.format(cal.getTime()));
int daysInMonth = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
cal.set(Calendar.DAY_OF_MONTH, daysInMonth);
System.out.println("本月结束日期:"+sdf.format(cal.getTime()));
}