下面是一些获取时间和日期的方法:

public static void getCurrentTimeUsingDate() {
    Date date = new Date();
    String strDateFormat = "hh:mm:ss a";
    DateFormat dateFormat = new SimpleDateFormat(strDateFormat);
    String formattedDate= dateFormat.format(date);
    Toast.makeText(this, formattedDate, Toast.LENGTH_SHORT).show();
}

使用日历的时间

public static void getCurrentTimeUsingCalendar() {
    Calendar cal = Calendar.getInstance();
    Date date=cal.getTime();
    DateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");
    String formattedDate=dateFormat.format(date);
    Toast.makeText(this, formattedDate, Toast.LENGTH_SHORT).show();
}

当地时间日期

public static void getCurrentTime(){
    System.out.println("-----Current time of your time zone-----");
    LocalTime time = LocalTime.now();
    Toast.makeText(this, time, Toast.LENGTH_SHORT).show();
}

分区时间

public static void getCurrentTimeWithTimeZone(){
    Toast.makeText(this, "Current time of a different time zone using LocalTime", Toast.LENGTH_SHORT).show();

    ZoneId zoneId = ZoneId.of("America/Los_Angeles");
    LocalTime localTime=LocalTime.now(zoneId);
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("HH:mm:ss");
    String formattedTime=localTime.format(formatter);
    Toast.makeText(this,formattedTime , Toast.LENGTH_SHORT).show();
}

获取当前时间和日期的简单方法

import java.util.Calendar

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

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.

你可以使用以下代码:

Calendar c = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String strDate = sdf.format(c.getTime());

输出:

2014-11-11 00:47:55

您还可以从这里获得SimpleDateFormat的更多格式化选项。

在com.google.gson.internal.bind.util包中有一个ISO8601Utils实用程序类，所以如果你在你的应用程序中使用Gson，你可以使用它。

它支持毫秒和时区，所以这是一个很好的开箱即用的选择。

你可以简单地使用下面的代码:

 DateFormat df = new SimpleDateFormat("HH:mm"); // Format time
 String time = df.format(Calendar.getInstance().getTime());

 DateFormat df1 = new SimpleDateFormat("yyyy/MM/dd"); // Format date
 String date = df1.format(Calendar.getInstance().getTime());

Use:

Time time = new Time();
time.setToNow();
System.out.println("time: " + time.hour + ":" + time.minute);

例如，这将为您提供“12:32”。

记得导入android.text.format.Time;。