/
* 获取当前月第一天
* @param firstDay
*/
public static String getFirstDay(){
String first = null;
try {
SimpleDateFormat format = new SimpleDateFormat(“yyyy-MM-dd”);
Calendar c = Calendar.getInstance(); //获取当前月第一天
c.add(Calendar.MONTH, 0);
c.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天
first = format.format(c.getTime());
} catch (Exception e) {
e.printStackTrace();
}
return first;
}
/
* 获取当前月最后一天 减一天
* @return
*/
public static String getLastDay(){
String last = null;
try {
SimpleDateFormat format = new SimpleDateFormat(“yyyy-MM-dd”);
Calendar ca = Calendar.getInstance();
ca.set(Calendar.DAY_OF_MONTH, ca.getActualMaximum(Calendar.DAY_OF_MONTH)-1);
last = format.format(ca.getTime());
} catch (Exception e) {
e.printStackTrace();
}
return last;
}
/
* 获取当前月前天日期
* @return
*/
public static String getBeforeDate(){
String strDate = “”;
try {
Date date = new Date(System.currentTimeMillis() – ());
SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd”);
strDate = sdf.format(date);
} catch (Exception e) {
e.printStackTrace();
}
return strDate;
}
/
* 获取某月第一天
* @param month
* @return
*/
public static String getFirtDayOfMonth(int month){
String firtDayOfMonth = null;
try {
SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd”);
Calendar cal = Calendar.getInstance();
//设置月份
cal.set(Calendar.MONTH, month-1);
//获取某月最大天数
int lastDay = cal.getActualMinimum(Calendar.DAY_OF_MONTH);
//设置日历中月份的最大天数
cal.set(Calendar.DAY_OF_MONTH, lastDay);
firtDayOfMonth = sdf.format(cal.getTime());
} catch (Exception e) {
e.printStackTrace();
}
return firtDayOfMonth;
}
/
* 获取某月最后一天
* @param month
* @return
*/
public static String getLastDayOfMonth(int month){
String lastDayOfMonth = null;
try {
SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd”);
Calendar cal = Calendar.getInstance();
//设置月份
cal.set(Calendar.MONTH, month-1);
//获取某月最大天数
int lastDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
//设置日历中月份的最大天数
cal.set(Calendar.DAY_OF_MONTH, lastDay);
lastDayOfMonth = sdf.format(cal.getTime());
} catch (Exception e) {
e.printStackTrace();
}
return lastDayOfMonth;
}
public static void main(String[] args) {
System.out.println(“获取当前月第一天 : “+getFirstDay());
System.out.println(“获取当前月最后一天减一天 : “+getLastDay());
System.out.println(“获取当前月前天日期 : “+getBeforeDate());
System.out.println(“获取某月第一天 : “+getFirtDayOfMonth(8));
System.out.println(“获取某月最后一天 : “+getLastDayOfMonth(8));
}
输出结果：
获取当前月第一天 : 2016-08-01
获取当前月最后一天减一天 : 2016-08-30
获取当前月前天日期 : 2016-08-25
获取某月第一天 : 2016-08-01
获取某月最后一天 : 2016-08-31
发布者：全栈程序员-站长，转载请注明出处：https://javaforall.net/205299.html原文链接：https://javaforall.net
