1.获取当前时间

方法一：

long nowLongTime = System.currentTimeMillis();

int month = cal.get(Calendar.MONTH) + 1;
int day = cal.get(Calendar.DAY_OF_MONTH); //本月中的第几天
int day1 = cal.get(Calendar.DATE); //日期
int day2 = cal.get(Calendar.DAY_OF_WEEK) + 1; //一年中的第几周
int day3 = cal.get(Calendar.DAY_OF_WEEK_IN_MONTH); //本月中的第几周
int day4 = cal.get(Calendar.DAY_OF_YEAR); //一年中的第几天
int hour = cal.get(Calendar.HOUR_OF_DAY);
int minute = cal.get(Calendar.MINUTE);
int second = cal.get(Calendar.SECOND);

方法二：

Time nowTime = new Time();
nowTime.setToNow();
int year = nowTime.year;
int month = nowTime.month + 1;
int day = nowTime.monthDay;
int hour = nowTime.hour;
int minute = nowTime.minute;
int second = nowTime.second;

方法三：
Date date = new Date();

cal.setTime(date);

2.类型转换

long转换为String

方法一：

public static String GetStringFromLong(long millis)
{
SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd HH:mm");
java.util.Date dt = new Date(millis);
return sdf.format(dt);
}

方法二：
public static String GetDate(long millis)
{
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(millis);
return String.format("%1$d年%2$d月%3$d日", cal.get(Calendar.YEAR), cal.get(Calendar.MONTH)+ 1,cal.get(Calendar.DAY_OF_MONTH));
}

 

Date转换为String

public static String GetStringFromDate(Date date)
{
SimpleDateFormat formatter = new SimpleDateFormat ("yyyy年MM月dd日 HH:mm:ss");
String str = formatter.format(date);
return str;
}


long转换为Date
public static Date GetDateFromLong(long millis)
{
Date date = new Date(millis);
return date;
}

 

Date转换为long

public static long GetLongFromDate(Date date)
{
return date.getTime();
}