Telegram Group Member Join Time Tool with Sorted Output

Preface

In a previous blog post, our join-group verification bot got a new feature that lets us manually trigger the join-group verification for any group member.

The problem it solved was this: when the bot leaves the group (or goes offline abnormally), new members join the group, but those new members never went through the join-group verification.

Then a new question pops up — how do I know which members joined during the period when the bot was absent from the group?

Requirements

Output each group member's join time.

Implementation

I recalled that we already had a tool for querying group member info

https://github.com/crazypeace/tg-get-group-member

We just need to do some GPT-driven coding and describe our requirements.

Based on the code above, add a feature:
Save each group member's join time

The amount of modification is very small.

I found that the join times in the result were unsorted.

So I added another requirement to GPT

Sort the query results by join time

The result GPT gave me was basically correct, but I had a particular requirement about the format saved to the file.

This project was originally designed to generate a user list for the speaking verification bot to use as the verified user list, valid.yaml

So the format saved to the file needs to be:

6617181826:
  username: atefatman
  full_name: 子 肥
7919966027:
  username: crazypeace_anti_bot_bot
  full_name: CZ_antibot_bot

I tried several options.

If I use a list, the file looks like this

- id: 399932510
  username: crazypeace
  full_name: ǝɔ∀ǝdʎz∀ɹɔ 👽
  joined_at: '2025-10-06T17:47:39.202290'
- id: 661519101
  username: testuser
  full_name: 测试 用户
  joined_at: '2025-10-07T12:11:22.501119'

If I use OrderedDict, the file looks like this

!!python/object/apply:collections.OrderedDict
- - - 1716213463
    - username: 8lojbk
      full_name: 系统安装 处理 搭建网络环境
      joined_at: '2022-03-31T07:01:32+00:00'
  - - 1215996169
    - username: ''
      full_name: z 8zz
      joined_at: '2022-03-31T07:07:10+00:00'

Finally I found out that in Python 3.7+, the dict is ordered (it preserves insertion order).

So ultimately I used a new dict to hold the sorted data, then wrote it to the file

Pushed to Github

https://github.com/crazypeace/tg-get-group-member

Comments