[java]
/**
* 計算指定日期為當年第幾周
* @param year 指定的年份
* @param month 指定的月份
* @param day 指定的日
* @return 指定日期為當年的第幾周
*/
public static int caculateWeekOfYear(int year,int month,int day){
Calendar c = Calendar.getInstance();
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, month – 1);
c.set(Calendar.DATE, day);
return c.get(Calendar.WEEK_OF_YEAR);
}
/**
* 獲取本月第一天是星期幾
* @return
*/
public static int getWeekOfFirstDay(Calendar c){
Calendar calendar = c;
calendar.set(Calendar.DAY_OF_MONTH, 1);
return calendar.get(Calendar.DAY_OF_WEEK);
}
/**
* 獲取本月1號是該年的第幾周
* @return
*/
public static int getMonthStartWeek(Calendar c){
Calendar calendar = c;
calendar.set(Calendar.DATE, 1);
return calendar.get(Calendar.WEEK_OF_YEAR);
}
/**
* 獲取當天是該年的第幾周
*/
public static int getCurrentWeekOfYear(){
Calendar calendar = Calendar.getInstance();
return calendar.get(Calendar.WEEK_OF_YEAR);
}
/**
* 獲取上月的總天數
* @return
*/
public static int getLastMonthDays(Calendar c){
Calendar calendar = c;
calendar.set(Calendar.MONTH, calendar.get(Calendar.MONTH) – 1);
return calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
}
/**
* 獲取指定月份的總天數
* @return
*/
public static int getCurrentMonthDays(int month){
Calendar c = Calendar.getInstance();
c.set(Calendar.MONTH, month);
return c.getActualMaximum(Calendar.DAY_OF_MONTH);
}
/**
* 獲取指定年份有多少周
* @param year
* @return
*/
public static int getTotalWeekOfYear(int year){
Calendar c = Calendar.getInstance();
return c.getActualMaximum(Calendar.WEEK_OF_YEAR);
}
/**
* 判斷指定月份是否是當前月
* @param month
* @return
*/
public static boolean isCurrentMonth(int month){
Calendar c = Calendar.getInstance();
return (c.get(Calendar.MONTH) == month)?true:false;
}
/**
* 計算指定的月份共有多少天
*/
public static int getTotalDaysOfMonth(int year, int month){
Calendar c = Calendar.getInstance();
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, month);
c.set(Calendar.DATE, 1);
/**
* 計算這個月有多少天
*/
return c.getActualMaximum(Calendar.DAY_OF_MONTH);
}
作者:huweilong1030