[jira] [Work logged] (VFS-257) FTP: Add support for MDTM to get more accurate last modified times

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/VFS-257?focusedWorklogId=387427&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-387427 ]

ASF GitHub Bot logged work on VFS-257:
--------------------------------------

                Author: ASF GitHub Bot
            Created on: 14/Feb/20 15:28
            Start Date: 14/Feb/20 15:28
    Worklog Time Spent: 10m 
      Work Description: moikeygraham commented on pull request #82: VFS-257 - FTP: Add support for MDTM to get more accurate last modified times
URL: https://github.com/apache/commons-vfs/pull/82
 
 
   Adding support for MDTM command when obtaining a FtpFileObject timestamp.
   
   The patch attached on the original JIRA was quite old, so I started fresh.
   
   Contains two test cases:
   - Server supporting MDTM command
   - Server not supporting MDTM command
 
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Issue Time Tracking
-------------------

            Worklog Id:     (was: 387427)
    Remaining Estimate: 0h
            Time Spent: 10m

> FTP: Add support for MDTM to get more accurate last modified times
> ------------------------------------------------------------------
>
>                 Key: VFS-257
>                 URL: https://issues.apache.org/jira/browse/VFS-257
>             Project: Commons VFS
>          Issue Type: Improvement
>    Affects Versions: 1.0
>            Reporter: Andrew Franklin
>            Priority: Major
>         Attachments: VFS-257.patch
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> The current FTPFileObject implementation delegates to the commons-net FtpFile to get the last modified date. Unfortunately this value is parsed from the result of the LIST command, which suffers from a few issues:
> * NET-212 - LMDs aren't persistable beyond a year as commons-net has to guess the year in many cases, based on the current year.
> * Most FTP parser formats are only accurate to the minute, and sometimes only the nearest day
> * Sometimes the FTP server will change the time format for a single file over time, changing the resulting lmd.
> By using the MDTM command you're able to get a last modified date that's accurate to the second (and sometimes even millisecond) and doesn't suffer from the above issues. As I understand it, the command is implemented in commons-net 2.1?



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