Date()日期转换和简单计算

/**

* 判断是否为闰年

* @param year

* @return

*/

public boolean isLeap ( int year )

{

if ( (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0) )

return true;

else

return false;

}

/**

* 判断某年某月总天数

* @param year

* @param month

* @return

*/

public int getDays ( int year , int month )     {

int tianshu = 0;

switch (month)

{

case 1:

case 3:

case 5:

case 7:

case 8:

case 10:

case 12:

tianshu = 31;

break;

case 4:

case 6:

case 9:

case 11:

tianshu = 30;

break;

case 2:

if ( isLeap(year) == true )

{

tianshu = 29;

}

else

{

tianshu = 28;

}

break;

}

return tianshu;

}

/**

* 在某Date()日期上增加几天或几个月

* @return 新的日期

*/

public static String changeDate(String str, int n) {

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

try {

Calendar cd = Calendar.getInstance();

cd.setTime(sdf.parse(str));

cd.add(Calendar.DATE, n); // 在审批基础上增加一天

// cd.add(Calendar.MONTH, n);//增加一个月

return sdf.format(cd.getTime());

} catch (Exception e) {

Global.getInstance().LogError(e);

return str;

}

}

//两个Date()相加减

public static void main(String[] args) {

try {

SimpleDateFormat dfs = new SimpleDateFormat("yyyy-MM-dd");

Date begin=dfs.parse("1992-08-10");

Date end =  new Date();

long between=(end.getTime()-begin.getTime())/1000;//除以1000是为了转换成秒

long day1=between/(24*3600);       //几天

long hour1=between%(24*3600)/3600; //零几小时

long minute1=between%3600/60;      //零几分钟

long second1=between%60/60;        //零几秒钟

} catch (ParseException e) {

e.printStackTrace();

}

}

//输入某人生日计算实际年龄

public static int getAge(String date) {

try {

SimpleDateFormat dfs = new SimpleDateFormat("yyyy-MM-dd");

Date begin = dfs.parse(date);

int month = begin.getMonth() + 1;

int day = begin.getDate();

Date end = new Date();

long between = (end.getTime() - begin.getTime()) / 1000;

long day1 = between / (24 * 3600);

int age = (int) (day1 / 365);

long nmonth = end.getMonth() + 1;

long nday = end.getDate();

if (nmonth < month || (nmonth == month && day < nday)) {

age--;

}

return age;

} catch (Exception e) {

e.printStackTrace();

return 0;

}

}

转成这样时间格式：二〇一四年九月二十一日

this.getCurrentDate = function() {
        var today = new Date();
        var chinese = ['〇', '一', '二', '三', '四', '五', '六', '七', '八', '九'];
        var y = today.getFullYear().toString();
        var m = (today.getMonth() + 1).toString();
        var d = today.getDate().toString();
        var result = "";
        for (var i = 0; i < y.length; i++) {
            result += chinese[y.charAt(i)];
        }
        result += "年";
        if (m.length == 2) {
            if (m.charAt(0) == "1") {
                result += ("十" + chinese[m.charAt(1)] + "月");
            }
        } else {
            result += (chinese[m.charAt(0)] + "月");
        }
        if (d.length == 2) {
            result += (chinese[d.charAt(0)] + "十" + chinese[d.charAt(1)] + "日");
        } else {
            result += (chinese[d.charAt(0)] + "日");
        }
        return result;
    };