Golang : Change a file last modified date and time
There are times when we need to perform some operation on a file, but then manually change the last modified and access time of the file.
In this tutorial, we will learn how to change a file last modified time with http://golang.org/pkg/os/#Chtimes function. The Chtimes will require the target filename, atime and mtime.
- atime: time of last access (ls -lu),
- mtime: time of last modification (ls -l)
Below the the code example :
changetime.go
package main
import (
"fmt"
"os"
"time"
)
func main() {
filename := "binary.file"
// get last modified time
file, err := os.Stat(filename)
if err != nil {
fmt.Println(err)
}
modifiedtime := file.ModTime()
fmt.Println("Last modified time : ", modifiedtime)
// get current timestamp
currenttime := time.Now().Local()
fmt.Println("Current time : ", currenttime.Format("2006-01-02 15:04:05 +0800"))
// change both atime and mtime to currenttime
err = os.Chtimes(filename, currenttime, currenttime)
if err != nil {
fmt.Println(err)
}
fmt.Println("Changed the file time information")
}
Result :
localhost:~ admin$ go run changetime.go
Last modified time : 2014-02-12 22:00:18 +0800 MYT <------ original last modified time
Current time : 2014-06-30 14:50:00 +0800
Changed the file time information
localhost:~ admin$ ls -la binary.file
-rwxr-xr-x 1 admin staff 2206048 Jun 30 14:50 binary.file <------- changed to Jun 30
See also : Golang : Get file last modified date and time
By Adam Ng
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