SimpleDateFormat format =
new
SimpleDateFormat(
"yyyy-MM-dd"
);
//獲取前月的第一天
Calendar cal_1=Calendar.getInstance();
//獲取當前日期
cal_1.add(Calendar.MONTH, -
1
);
cal_1.set(Calendar.DAY_OF_MONTH,
1
);
//設置為1號,當前日期既為本月第一天
firstDay = format.format(cal_1.getTime());
System.out.println(
"-----1------firstDay:"
+firstDay);
//獲取前月的最后一天
Calendar cale = Calendar.getInstance();
cale.set(Calendar.DAY_OF_MONTH,
0
);
//設置為1號,當前日期既為本月第一天
lastDay = format.format(cale.getTime());
System.out.println(
"-----2------lastDay:"
+lastDay);
//獲取當前月第一天：
Calendar c = Calendar.getInstance();
c.add(Calendar.MONTH,
0
);
c.set(Calendar.DAY_OF_MONTH,
1
);
//設置為1號,當前日期既為本月第一天
String first = format.format(c.getTime());
System.out.println(
"===============first:"
+first);
//獲取當前月最后一天
Calendar ca = Calendar.getInstance();
ca.set(Calendar.DAY_OF_MONTH, ca.getActualMaximum(Calendar.DAY_OF_MONTH));
String last = format.format(ca.getTime());
System.out.println(
"===============last:"
+last);
/**
* 字符串的日期格式的計算
*/
public
static
int
daysBetween(String smdate,String bdate)
throws
ParseException{
SimpleDateFormat sdf=
new
SimpleDateFormat(
"yyyy-MM-dd"
);
Calendar cal = Calendar.getInstance();
cal.setTime(sdf.parse(smdate));
long
time1 = cal.getTimeInMillis();
cal.setTime(sdf.parse(bdate));
long
time2 = cal.getTimeInMillis();
long
between_days=(time2-time1)/(
1000
*
3600
*
24
);
return
Integer.parseInt(String.valueOf(between_days));
}