Because the underlying structure used to represent DateTime is a struct, 
which is simply a map under the hood. 
Erlang/Elixir uses a rather arbitrary order of keys (e.g. hour -> year -> 
day -> minute) when comparing 2 maps which you can't control.

Thus, you need to have a specific function that would compare these structs 
according to implied field order (year -> month -> day -> hour -> etc.)

More: 
https://hexdocs.pm/elixir/main/NaiveDateTime.html#module-comparing-naive-date-times

On Thursday, 2 March 2023 at 4:38:00 pm UTC+1 cbw...@gmail.com wrote:

> Can't you compare DateTime with '>' or '<' instead of DateTime.compare?
>

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