Java Program to Change Last Modification Time of a File
Modifying the date of the file is possible through Java using the File class of Java i.e File.setLastModified() method
Java File Class
The File class is Java’s representation of a file or directory pathname. The File class contains several methods for working with the pathname, deleting and renaming files, creating new directories, listing the contents of a directory, and determining several common attributes of files and directories.
The setLastModified() function is a method that comes predefined in the Java File class. The function sets the last modified time of a file or directory. The function sets the last modified value of the file in milliseconds (long type).
Parameters – A string consisting of the new last-modified time in milliseconds.
Return value – It returns a boolean. (True if the operation succeeds, else false).
If the file doesn’t found in the system default date is printed as of 30/01/1970 as the default file is generated by the system.
Now to change the last modified date of a file, follow the given steps.
- First, use the SimpleDateFormat(“mm/dd/yyyy”) constructor to make a new SimpleDateFormat class instance.
- Then, construct a String object with the “mm/dd/yyyy” format.
- Use the parse(String) method of the SimpleDateFormat class to create a new Date object with the date value of the String we created.
- Finally, use File.setLastModified(Date.getTime()) method to set the new “Last Modified” date of our file.
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