String DataString = DateFormat.getDateInstance(DateFormat.SHORT).format(Calendar.getInstance().getTime());

获取单元本地化格式的短日期格式字符串。

我不明白为什么这么多答案使用硬编码的日期和时间格式，而OS/Java提供了正确的日期和时间本地化。总是使用设备的格式不是比使用程序员的格式更好吗?

它还提供了本地化格式的日期读取:

    DateFormat format = DateFormat.getDateInstance(DateFormat.SHORT);
    Date date = null;
    try {
        date = format.parse(DateString);
    }
    catch(ParseException e) {
    }

然后由用户来设置显示日期和时间的格式，而不是你。不论语言等，同一种语言在不同的国家有不同的格式。

试试下面的方法。下面给出了所有格式以获得日期和时间格式。

    Calendar c = Calendar.getInstance();
    SimpleDateFormat dateformat = new SimpleDateFormat("dd-MMM-yyyy hh:mm:ss aa");
    String datetime = dateformat.format(c.getTime());
    System.out.println(datetime);

你可以用:

import java.util.Calendar;
import java.util.Date;

Date currentTime = Calendar.getInstance().getTime();

Calendar中有许多常量可以满足您的所有需要。

检查Calendar类文档。

实际上，使用time . getcurrenttimezone()在设备上设置当前时区更安全，否则您将获得UTC的当前时间。

Time today = new Time(Time.getCurrentTimezone());
today.setToNow();

然后，你可以得到你想要的所有日期字段，例如:

textViewDay.setText(today.monthDay + "");             // Day of the month (1-31)
textViewMonth.setText(today.month + "");              // Month (0-11)
textViewYear.setText(today.year + "");                // Year 
textViewTime.setText(today.format("%k:%M:%S"));  // Current time

详情请参阅android.text.format.Time类。

更新

正如许多人指出的那样，谷歌说这个类有一些问题，不应该再使用了:

This class has a number of issues and it is recommended that GregorianCalendar is used instead. Known issues: For historical reasons when performing time calculations all arithmetic currently takes place using 32-bit integers. This limits the reliable time range representable from 1902 until 2037.See the wikipedia article on the Year 2038 problem for details. Do not rely on this behavior; it may change in the future. Calling switchTimezone(String) on a date that cannot exist, such as a wall time that was skipped due to a DST transition, will result in a date in 1969 (i.e. -1, or 1 second before 1st Jan 1970 UTC). Much of the formatting / parsing assumes ASCII text and is therefore not suitable for use with non-ASCII scripts.

    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
    Calendar cal = Calendar.getInstance();
    System.out.println("time => " + dateFormat.format(cal.getTime()));

    String time_str = dateFormat.format(cal.getTime());

    String[] s = time_str.split(" ");

    for (int i = 0; i < s.length; i++) {
         System.out.println("date  => " + s[i]);
    }

    int year_sys = Integer.parseInt(s[0].split("/")[0]);
    int month_sys = Integer.parseInt(s[0].split("/")[1]);
    int day_sys = Integer.parseInt(s[0].split("/")[2]);

    int hour_sys = Integer.parseInt(s[1].split(":")[0]);
    int min_sys = Integer.parseInt(s[1].split(":")[1]);

    System.out.println("year_sys  => " + year_sys);
    System.out.println("month_sys  => " + month_sys);
    System.out.println("day_sys  => " + day_sys);

    System.out.println("hour_sys  => " + hour_sys);
    System.out.println("min_sys  => " + min_sys);

这是一个获取日期和时间的有用方法:

private String getDate(){
    DateFormat dfDate = new SimpleDateFormat("yyyy/MM/dd");
    String date=dfDate.format(Calendar.getInstance().getTime());
    DateFormat dfTime = new SimpleDateFormat("HH:mm");
    String time = dfTime.format(Calendar.getInstance().getTime());
    return date + " " + time;
}

你可以调用这个方法来获取当前的日期和时间值:

2017/01//09 19:23