Mails datetime is based on the file last change time instead of arrive date

[UtechtDustin]

I setup a new server and pasted a backup of my nextcloud and mailserver.
Anything works fine but the time shows always "7 days before" (just in a other language).
Thunderbird, Roundcube and my mobile Phone shows the correct arrive date!

Expected behavior

Show the correct datetime when the mail arrived.

Actual behavior

Shows the last change time from the mail file!

Mail app

Mail app version: (see apps admin page, e.g. 0.5.3)
0.8.1
Mailserver or service: (e.g. Outlook, Yahoo, Gmail, Exchange,...)
own
Number of accounts: (e.g. 1 or 2)
1

Server configuration

Operating system: (e.g. Debian 8)
Debian 8
Web server: (e.g. Apache, Nginx,...)
Apache
Database: (e.g. MariaDB, SQLite, PostgreSQL,...)
MariaDB
PHP version: (e.g. 7.0)
7.1

Nextcloud Version: (see admin page, e.g. 13.0.2)
13.0.2
Updated from an older version or fresh install:
fresh install
List of activated apps:

Enabled:                                                                                                                                                                                                            
  - activity: 2.6.1                                                                                                                                                                                                 
  - calendar: 1.6.1                                                                                                                                                                                                 
  - caniupdate: 0.1.2                                                                                                                                                                                               
  - comments: 1.3.0                                                                                                                                                                                                 
  - contacts: 2.1.3                                                                                                                                                                                                 
  - dav: 1.4.6
  - deck: 0.3.1
  - federatedfilesharing: 1.3.1
  - federation: 1.3.0
  - files: 1.8.0
  - files_pdfviewer: 1.2.1
  - files_rightclick: 0.8.4
  - files_sharing: 1.5.0
  - files_texteditor: 2.5.1
  - files_trashbin: 1.3.0
  - files_versions: 1.6.0
  - files_videoplayer: 1.2.0
  - firstrunwizard: 2.2.1
  - gallery: 18.0.0
  - issuetemplate: 0.3.0
  - logreader: 2.0.0
  - lookup_server_connector: 1.1.0
  - mail: 0.8.1
  - nextcloud_announcements: 1.2.0
  - notifications: 2.1.2
  - oauth2: 1.1.0
  - onlyoffice: 1.3.0
  - password_policy: 1.3.0
  - provisioning_api: 1.3.0
  - serverinfo: 1.3.0
  - sharebymail: 1.3.0
  - survey_client: 1.1.0
  - systemtags: 1.3.0
  - theming: 1.4.1
  - twofactor_backupcodes: 1.2.3
  - updatenotification: 1.3.0
  - workflowengine: 1.3.0
Disabled:
  - admin_audit
  - encryption
  - files_external
  - user_external
  - user_ldap

The content of config/config.php:

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "***REMOVED SENSITIVE VALUE***"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "overwrite.cli.url": "https:\/\/***REMOVED SENSITIVE VALUE***\/nextcloud",
        "dbtype": "mysql",
        "version": "13.0.2.1",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "php",
        "mail_smtpauthtype": "LOGIN",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "loglevel": 0,
        "maintenance": false,
        "theme": ""
    }
}

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[ChristophWurst]

This should be easy to fix:

mail/lib/Mailbox.php

Line 118 in 73dd0f0

Horde_Imap_Client::SORT_DATE

[UtechtDustin]

@ChristophWurst
Its not a sorting issue, the issue is the display of the "arrive date".

German:
Das eigentliche Problem ist das bei jeder E-mail steht das diese vor x Tagen angekommen sei, obwohl die Teils schon Jahre alt sind.
Die stelle in der Mailbox.php ist fürs sortieren da oder nicht ?

[ChristophWurst]

Got it. That should be very similar to fix. At some point there is a call to the horde library that specifies which attributes are to fetch and there we'd have to fetch the correct date and then also use that from there.