FDM(免费下载管理器)如何确定文件和时间?

发布于 2025-02-01 18:30:52 字数 639 浏览 4 评论 0 原文

我认为你们中的许多人都使用下载经理。我使用免费下载管理器,我非常喜欢。但是我对这个有价值的工具如何确定文件下载的文件的日期和时间感到困惑。

例如,我从
下载了PDF文件

,它将文件的日期设置为以下 |创建:2019年9月20日,星期五,下午6:12:36,

当我检查HTTP标头时,我找到了此信息
|最后修饰:2018年9月12日星期三15:22:28 GMT

我检查了PDF文件中记录的创建日期时,我找到了
|创建:2018年9月12日星期三8:21:12 GMT


有人知道上面列出的2019年日期来自哪里?

I assume many of you use download managers. I use the Free Download Manager, and I like it a lot. But I am confused about how this valuable tool determines the date and time of the file it downloads.

For example, I downloaded the PDF file from
https://www.cusd80.com/cms/lib/AZ01001175/Centricity/Domain/10180/The%20Crucible%20Anchor%20Text.pdf

And it sets the file's date-time as following
| Created: ‎Friday, ‎September ‎20, ‎2019, ‏‎6:12:36 PM

When I checked HTTP headers, I found this information
| last-modified: Wed, 12 Sep 2018 15:22:28 GMT

When I checked the creation date-time recorded in the PDF file, I found
| Created: Wed, 12 Sep 2018 8:21:12 GMT


Does anyone have any idea where the 2019 date listed above comes from?

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评论(2

極樂鬼 2025-02-08 18:30:52

取消选中选项“使用服务器时间进行文件创建”下方
偏好 - >一般 - >下载。这将创建时间实际下载时间

uncheck the option "use server time for file creation" under
preferences -> general -> downloads. this will the creation time actual download time

芯好空 2025-02-08 18:30:52

当您下载文件时,它具有日期,在这种情况下,文件存储在服务器上,我们会看到服务器文件修改日期

curl -i https://www.cusd80.com/cms/lib/AZ01001175/Centricity/Domain/10180/The%20Crucible%20Anchor%20Text.pdf
HTTP/1.1 200 OK
Content-Type: application/pdf
Content-Length: 6020870
Connection: keep-alive
Date: Mon, 17 Apr 2023 20:41:22 GMT
Cache-Control: private

最后修改:FRI,2019年9月20日22:12:36 GMT

Accept-Ranges: bytes
ETag: "921b4682070d51:0"
Server: Microsoft-IIS/8.5
Strict-Transport-Security: max-age=31536000; includeSubDomains;
X-XSS-Protection: 1; mode=block
X-Powered-By: ASP.NET
Content-Security-Policy: frame-ancestors 'self' https://*.ally.ac;
X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
Vary: Accept-Encoding
X-Cache: Miss from cloudfront
Via: 1.1 64f1d594216061fb1311499e08a4ee1a.cloudfront.net (CloudFront)
X-Amz-Cf-Pop: LHR61-P4
X-Amz-Cf-Id: 0e3WxAEhhry-z_piciSaut39s-PqkiC2llRWUKETJ8P_P-Jsu5FRvA==

时间与时区相关,因此下载本地时间可能会有所不同。请注意我的卷发时间(22:12)和OP观察6:12 pm(18:12)

我的副本说创建和mod的当前时间 ,因为我只是在没有文件经理的情况下下载了使用

curl -O https://www.cusd80.com/cms/lib/AZ01001175/Centricity/Domain/10180/The%20Crucible%20Anchor%20Text.pdf

内部文件有多个日期,但最常见的两个日期将通过文件详细信息,但既不一定都必须显示。

3 0 obj
<</CreationDate(D:20180912082112)/Creator(PDFium)/Producer(PDFium)>>
endobj

注意:PDF内部或外部的时间不需要真实,它可以是过去或将来,但必须不小于名义一年的任何4位数字。但是,对于某些测试,除了使用更新跟踪时,所有其他日期都应同意另一个或全部的日期,但仍然可以被欺骗,在创建之前进行修改!

When you download a file It has a date the file was stored on the server in this case we see the server file modified date

curl -i https://www.cusd80.com/cms/lib/AZ01001175/Centricity/Domain/10180/The%20Crucible%20Anchor%20Text.pdf
HTTP/1.1 200 OK
Content-Type: application/pdf
Content-Length: 6020870
Connection: keep-alive
Date: Mon, 17 Apr 2023 20:41:22 GMT
Cache-Control: private

Last-Modified: Fri, 20 Sep 2019 22:12:36 GMT

Accept-Ranges: bytes
ETag: "921b4682070d51:0"
Server: Microsoft-IIS/8.5
Strict-Transport-Security: max-age=31536000; includeSubDomains;
X-XSS-Protection: 1; mode=block
X-Powered-By: ASP.NET
Content-Security-Policy: frame-ancestors 'self' https://*.ally.ac;
X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
Vary: Accept-Encoding
X-Cache: Miss from cloudfront
Via: 1.1 64f1d594216061fb1311499e08a4ee1a.cloudfront.net (CloudFront)
X-Amz-Cf-Pop: LHR61-P4
X-Amz-Cf-Id: 0e3WxAEhhry-z_piciSaut39s-PqkiC2llRWUKETJ8P_P-Jsu5FRvA==

The time is relative to time zone so on download the local times may be hours different. Note the difference with my curl time (22:12) and OP observation of 6:12 PM (18:12)

My copy says current time for both created and mod because I simply download without a File Manager with

curl -O https://www.cusd80.com/cms/lib/AZ01001175/Centricity/Domain/10180/The%20Crucible%20Anchor%20Text.pdf

Internally the file has multiple dates but the two most commonly shown will be via file details but neither nor both have to be shown.

enter image description here

3 0 obj
<</CreationDate(D:20180912082112)/Creator(PDFium)/Producer(PDFium)>>
endobj

NOTE: the time inside or outside a PDF does not need to be true it can be past or future but must be not less than any 4 digits for a nominal year. However for certain tests all dates should concur for all of one or all of the other except when using update tracking, but can still be spoofed, to say modified before creation!

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