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Date()日期简单计算
/**
* 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;
}
}