这里是另一个解决方案，这是在kotlin:

val df: DateFormat = SimpleDateFormat("yyyy.MM.dd HH:mm:ss")
val timeStamp = df.format(Calendar.getInstance().time)

输出的例子:

"2022.04.22 10:22:35"

你可以使用SimpleDateFormat类:

SimpleDateFormat s = new SimpleDateFormat("ddMMyyyyhhmmss");
String format = s.format(new Date());

这里是最广为人知的方法的比较列表

你可以通过尝试下面的代码在Android中获得当前时间戳

time.setText(String.valueOf(System.currentTimeMillis()));

和时间戳到时间格式

SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
String dateString = formatter.format(new Date(Long.parseLong(time.getText().toString())));
time.setText(dateString);

Kotlin解决方案:

val nowInEpoch = Instant.now().epochSecond

确保你的最低SDK版本是26。

来自开发者博客:

System.currentTimeMillis() is the standard "wall" clock (time and date) expressing milliseconds since the epoch. The wall clock can be set by the user or the phone network (see setCurrentTimeMillis(long)), so the time may jump backwards or forwards unpredictably. This clock should only be used when correspondence with real-world dates and times is important, such as in a calendar or alarm clock application. Interval or elapsed time measurements should use a different clock. If you are using System.currentTimeMillis(), consider listening to the ACTION_TIME_TICK, ACTION_TIME_CHANGED and ACTION_TIMEZONE_CHANGED Intent broadcasts to find out when the time changes.