一、工具类 方法
//获取指定月份的天数
public static int getDaysByYearMonth(int year, int month) {
Calendar a = Calendar.getInstance();
a.set(Calendar.YEAR, year);
a.set(Calendar.MONTH, month - 1);
a.set(Calendar.DATE, 1);
a.roll(Calendar.DATE, -1);
int maxDate = a.get(Calendar.DATE);
return maxDate;
}
二、遍历
public void dayReport(Date month) {
Calendar cal = Calendar.getInstance();
cal.setTime(month);//month 为指定月份任意日期
int year = cal.get(Calendar.YEAR);
int m = cal.get(Calendar.MONTH);
int dayNumOfMonth = TimeUtils.getDaysByYearMonth(year, m);
cal.set(Calendar.DAY_OF_MONTH, 1);// 从一号开始
for (int i = 0; i < dayNumOfMonth; i++, cal.add(Calendar.DATE, 1)) {
Date d = cal.getTime();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
String df = simpleDateFormat.format(d);
}
}