[VFS-257] FTP: Add support for MDTM to get more accurate last modified times

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.0
• Fix Version/s: 2.8.0
• Assignee: Unassigned
• Reporter: Andrew Franklin
• Created: 18/May/09 06:43
• Updated: 09/Feb/21 14:50
• Resolved: 09/Feb/21 14:50

Description

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?

Issue Links

• links to: GitHub Pull Request #82