如何将文件上次修改的时间戳转换为日期？

Question

How do I convert File#lastModified() to a real date? The format is not really important.

Answer 1

Date d = new Date(file.lastModified());

lastModified() returns the milliseconds since 1970-01-01, and the Date class stores its time also in the same way. The Date(long) constructor takes these milliseconds, and initializes the Date with it.

Answer 2

Just you use the SimpleDateFormat class to convert long to date. Only you execute code:

new SimpleDateFormat("dd-MM-yyyy HH-mm-ss").format(
    new Date(new File(filename).lastModified()) 
);

Answer 3

What you get is a long number representing the number of millis elapsed from Jan 1st, 1970. That's the standard way of representing dates.

try this:

java.util.Date myDate = new java.util.Date(theFile.lastModified());

and now you have a Date object at hand.

You can use SimpleDateFormat to print that date in a cuter way.

Answer 4

1. Get the last modified timestamp, as described in the duplicate of your question

2. Create a new Date object, or Calendar object. new Date(timestamp) . Or Calendar.getInstance() and then call setTimeInMillis(timestamp) . As the name suggests, the timestamp is actually a number of milliseconds (since Jan 1st 1970)

3. You can then format the date via java.text.SimpleDateFormat