setLastModified(long time)


On this document we will be showing a java example on how to use the setLastModified(long time) method of File Class. This method sets the last-modified time of the file or directory named by this abstract pathname.

All platforms support file-modification times to the nearest second, but some provide more precision. The argument will be truncated to fit the supported precision. If the operation succeeds and no intervening operations on the file take place, then the next invocation of the lastModified() method will return the (possibly truncated) time argument that was passed to this method.


  • IllegalArgumentException – If the argument is negative
  • SecurityException – If a security manager exists and its SecurityManager.checkWrite(java.lang.String) method denies write access to the named file

Method Syntax

public boolean setLastModified(long time)

Method Argument

Data Type Parameter Description
long time The new last-modified time, measured in milliseconds since the epoch (00:00:00 GMT, January 1, 1970)

Method Returns

This method returns boolean, true if and only if the operation succeeded; false otherwise.


Requires Java 1.2 and up

Java File setLastModified(long time) Example

Below is a java code demonstrates the use of setLastModified(long time) method of File class. The example presented might be simple however it shows the behaviour of the setLastModified(long time) method of File class. Basically on this example, we just make use of the Calendar class to get the current time and set it as value on the setLastModified() method. This would set the last modified date of the File as the current time.

Sample Output

Below is the sample output when you run the above example.

java lang File setLastModified() example output

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