Python set modification time

How can I set the last modified time of a file from python?

There are 2 ways to do this. One is the os.utime example which is required if you are setting the timestamp on a file that has no reference stats.

However, if you are copying the files with shutil.copy() you have a reference file. Then if you want the permission bits, last access time, last modification time, and flags also copied, you can use shutil.copystat() immediately after the shutil.copy() .

And then there is shutil.copy2 which is intended to do both at once.

To edit a file last modified field, use:

os.utime(r'C:\my\file\path.pdf', (1602179630, 1602179630)) 

💡 — Epoch is the number of seconds that have elapsed since January 1, 1970. see more

If you are looking for a datetime version:

import datetime import os def set_file_last_modified(file_path, dt): dt_epoch = dt.timestamp() os.utime(file_path, (dt_epoch, dt_epoch)) # . now = datetime.datetime.now() set_file_last_modified(r'C:\my\file\path.pdf', now) 

Jossef Harush Kadouri 29702

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Change File Modification Time In Python

This post demonstrates how to change a file modification time in Python. No third party modules are required and it will work on Windows, Mac and Linux.

File modification times show when a file was last edited. This can sometimes be confused with creation time but these are very different. Creation time is normally held by the operating system and states when a file was created. This means if you download a file from the internet, the creation time will change and be the time it was downloaded. Thus the creation time isn’t very helpful.

File modification time is different however as it is stored in the file. Even though the operating system still manages these, they can still be easily changed as opposed to creation time.

The modification date can be found by right-clicking on a file and selecting properties.

Setting File Modification Times

First, you will want to import os, time and datetime.

import os import time import datetime 

You will now need to locate the file you want to edit and create a time object to set to the file. To create one, we will first break it down into its simpler parts.

fileLocation = r"" year = 2017 month = 11 day = 5 hour = 19 minute = 50 second = 0 

fileLocation is a string and the rest of the variables above are integers.

Next, we will create our datetime object using the data given and then convert it to seconds since epoch; this is what will be stored.

date = datetime.datetime(year=year, month=month, day=day, hour=hour, minute=minute, second=second) modTime = time.mktime(date.timetuple()) 

Now we can do a simple os.utime call passing the file and modification time to set the new times.

os.utime(fileLocation, (modTime, modTime)) 

Now if you go back and check the modification date it should be changed.

import os import time import datetime fileLocation = r"" year = 2017 month = 11 day = 5 hour = 19 minute = 50 second = 0 date = datetime.datetime(year=year, month=month, day=day, hour=hour, minute=minute, second=second) modTime = time.mktime(date.timetuple()) os.utime(fileLocation, (modTime, modTime)) 

But how do I change creation time?

The solution is platform-specific but for Windows you can look at this.

Owner of PyTutorials and creator of auto-py-to-exe. I enjoy making quick tutorials for people new to particular topics in Python and tools that help fix small things.

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How to set file modification time (mtime) in Python

You can use os.utime() to set the access and modification times of files in Python. In order to set just the access time ( mtime ) use this snippet:

# mtime must be a datetime stat = os.stat(filename) # times must have two floats (unix timestamps): (atime, mtime) os.utime(filename, times=(stat.st_atime, mtime.timestamp()))

Or use this utility function:

from datetime import datetime import os def set_file_modification_time(filename, mtime): """ Set the modification time of a given filename to the given mtime. mtime must be a datetime object. """ stat = os.stat(filename) atime = stat.st_atime os.utime(filename, times=(atime, mtime.timestamp()))

# Set the modification time of myfile.txt to 1980-1-1, leave the acess time intact set_file_modification_time("myfile.txt", datetime(1980, 1, 1, 0, 0, 0))

In case you need to compatible with Python 2.x, use this variant instead:

from datetime import datetime import os import time def datetime_to_timestamp(dt): return time.mktime(dt.timetuple()) + dt.microsecond/1e6 def set_file_modification_time(filename, mtime): """ Set the modification time of a given filename to the given mtime. mtime must be a datetime object. """ stat = os.stat(filename) atime = stat.st_atime os.utime(filename, (atime, datetime_to_timestamp(mtime)))

In case you have any option of using Python 3.x, I recommend using the Python 3 version listed above, since it’s much more readable, involves less code and (at the time of writing this code), Python 2 will be retired in only a couple of months. I recommend upgrading your scripts with Python 3 compatibility as soon as possible as many other projects have already done.

If this post helped you, please consider buying me a coffee or donating via PayPal to support research & publishing of new posts on TechOverflow

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birkin / python_set_date.md

using python, how would I change a file creation-date for a pdf?

Modifying a file’s creation time isn’t a standard operation because it’s not a common need and it can potentially cause issues. However, it is possible to do this using the Python os and datetime modules, specifically using the os.utime function.

Here is a basic example of how you can change the creation date of a file:

import os import time import datetime # specify your file path filepath = '/path/to/your/file.pdf' # specify the creation date you want to set new_creation_time = datetime.datetime(2023, 5, 17, 0, 0) # convert the datetime object to a timestamp new_timestamp = time.mktime(new_creation_time.timetuple()) # change the creation date of the file os.utime(filepath, (new_timestamp, new_timestamp))

In this example, the creation time and modification time of the file at filepath are set to the timestamp equivalent of May 17, 2023, at 00:00.

1. The os.utime function changes both the access time and the modified time. As far as I know, there’s no standard way in Python to change only the creation time of a file.
2. This method will work on Unix systems (like Linux or MacOS). On Windows, it might not work as expected because Windows handles file timestamps differently. For Windows, you might need to use a platform-specific API to modify the creation time, such as pywin32.
3. Changing file timestamps can have unexpected side effects, like affecting backups or causing issues with file synchronization, so it’s generally not recommended unless you have a specific reason for doing it.
4. Make sure you have the appropriate permissions to modify the file.

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