How is it done in Telegram?

Question

Bots

When clicking on a link on one of the Telegram channels, I got to the channel of one advanced programmer (I understood this from the content). Here's the thing that hooked me: at the bottom, where there is an input line in a regular chat, but there was no chat here, on the left in the line there is a calendar icon, tap on it, the calendar opens, select a date, tap on the ^ icon and publications are pulled up to this date or, if on there were no publications on the specified date, then to the nearest one. Now no subscription to this channel has been preserved, nor can I find the link.
What was it ? And how to implement it?

Answer 1

You probably just opened the search, that's all.

Answer 2

I saw something like this recently. Implemented ordering tickets by date, it displays just the calendar data.
You need to look for it in github. It’s only possible to implement it with code, I haven’t seen anything like this in chat bot settings services