> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/sidef-lang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/sidef-lang/programming_tasks/f/file_modification_time.md).

# File modification time

```ruby
var file = File(__FILE__)
say file.stat.mtime            # seconds since the epoch
 
# keep atime unchanged
# set mtime to current time
file.utime(file.stat.atime, Time.now)
```