[Feature Request] Add Date Option Patch

[kristofferR]

Checklist

• I'm reporting a feature request
• I've verified that I'm running yt-dlp version 2021.01.29
• I've searched the bugtracker for similar feature requests including closed ones

Description

There's a fork of youtube-dl by @kade-robertson with a great date option patch, which allows you to add the time/date when the video was uploaded to the filename:
https://github.com/kade-robertson/youtube-dl

Here's the relevant commit/patch:
ytdl-org/youtube-dl@4d6c8b1

It would be great if it could get merged in here. It's very useful.

[pukkandan]

The patch given is a temporary measure at best. What if someone else wants this functionality for release_date instead? Adding all those extra fields only makes the code bloated and hard to maintain in future. I will see if it is possible to create a general solution for this using the output template itself. Maybe something like -o %(upload_date|yy-mm-dd)t

[pukkandan]

Proof of concept: pukkandan/empty@4469558

Eg:

$youtube-dlc https://www.youtube.com/watch?v=N5di3IroHnY -o "duration=%(duration>%H-%M-%S)t, uploaded=%(upload_date>%Y day%j)t" --get-filename
duration=00-13-35, uploaded=2020 day309

[kade-robertson]

Since I got tagged I figured I would post the pull request I originally made for this feature that was closed for the exact reasons above, it's not a great solution. This properly implemented would be a good thing to get into upstream as well (I'm not sure how diverged yt-dlp is at this point).

ytdl-org/youtube-dl#13752

Note dsttfw's feedback:

The general idea is to allow something like %(field[:<field_specific_formatter>])<standard_formatter>.

[pukkandan]

%(field[:<field_specific_formatter>])<standard_formatter>

Let me see if it is possible to make the date formatting work with the standard formatter

[pukkandan]

pukkandan/empty@abb10ff

Now it should be possible to do formats like %(upload_date>%d).1d, although I don't understand why anyone would want to do that, considering how flexible strftime already is

I also changed it to use just %()s rather than %()t

[pukkandan]

Output templates are complicated and I would appreciate if someone could review the code. I'll make a PR so that it's easier to review