Book fileLastModified reports UTC timestamps, but values are actually localized

[farahnur42]

Steps to reproduce

1. Add a newly grabbed/created/modified book to any series
2. Check fileLastModified for that book from the API response (with e.g. /api/v1/books/{bookId})

{
  "id": "0F58NY1Z9D205",
  "seriesId": "0CJ42PH9819KV",
  "seriesTitle": "The Pension Life Vampire",
  "libraryId": "04CQ0DEQJ2E78",
  "name": "The Pension Life Vampire c022 (2024) (Digital)",
  "url": "/manga/The Pension Life Vampire/The Pension Life Vampire c022 (2024) (Digital).cbz",
  "number": 27,
  "created": "2024-02-16T16:28:12Z",
  "lastModified": "2024-02-16T16:29:27Z",
  "fileLastModified": "2024-02-16T11:42:32Z", ## should be 2024-02-16T05:42:32Z
  "sizeBytes": 14802017,
  "size": "14.1 MiB",
  "media": {
    "status": "READY",
    "mediaType": "application/zip",
    "pagesCount": 20,
    "comment": "",
    "epubDivinaCompatible": false,
    "mediaProfile": "DIVINA"
  },
  "metadata": {
    "title": "The Pension Life Vampire c022 (2024) (Digital)",
    "titleLock": false,
    "summary": "",
    "summaryLock": false,
    "number": "22",
    "numberLock": true,
    "numberSort": 22,
    "numberSortLock": true,
    "releaseDate": null,
    "releaseDateLock": false,
    "authors": [
      {
        "name": "Shouichi Taguchi",
        "role": "penciller"
      },
      {
        "name": "Shouichi Taguchi",
        "role": "inker"
      },
      {
        "name": "Shouichi Taguchi",
        "role": "colorist"
      },
      {
        "name": "Shouichi Taguchi",
        "role": "letterer"
      },
      {
        "name": "Shouichi Taguchi",
        "role": "cover"
      },
      {
        "name": "Shouichi Taguchi",
        "role": "writer"
      }
    ],
    "authorsLock": false,
    "tags": [],
    "tagsLock": false,
    "isbn": "",
    "isbnLock": false,
    "links": [],
    "linksLock": false,
    "created": "2024-02-16T16:28:12Z",
    "lastModified": "2024-02-16T16:34:28Z"
  },
  "readProgress": null,
  "deleted": false,
  "fileHash": "6748aa089dd44956a83397d06ffaf1f8",
  "oneshot": false
}

3. Notice that the time is localized, not in UTC.
   

Expected behavior

The time should be converted to UTC from whatever the configured timezone is, as the API reports it as UTC.

Actual behavior

The time is localized so it can be either in the future or the past depending on your native timezone (in my case perpetually 6h in the future).

Logs

No response

Komga version

1.10.3-master

Operating system

Docker

Installation method

Docker

Other details

This throws off the date/time for recently added content on e.g. the Tachiyomi Komga extension <=1.4.55 (1.4.55 switches from fileLastModified to lastModified which is even more incorrect as any metadata change, reordering etc to the book will throw it off - I've asked for this behaviour to be reverted once the timestamps are fixed Komga-side).

Acknowledgements

• I have searched the existing issues (open AND closed) and this is a new ticket, NOT a duplicate or related to another open issue.
• I have written a short but informative title.
• I have checked the FAQ.
• I have updated the app to the latest version.
• I will fill out all of the requested information in this form.

[gotson]

can you provide details of your filesystem time for that file ?

[farahnur42]

This throws off the date/time for recently added content on e.g. the Tachiyomi Komga extension <=1.4.55 (1.4.55 switches from fileLastModified to lastModified which is even more incorrect as any metadata change, reordering etc to the book will throw it off - I've asked for this behaviour to be reverted once the timestamps are fixed Komga-side).

Update on this for anyone stumbling upon this issue: 1.4.56 switches over to book.created instead of book.LastModified, and it can be switched back over to fileLastModified in the future.

[github-actions]

🎉 This issue has been resolved in 1.10.4 (Release Notes)