How to change time format for input_datetime helper entity?

[viktorp75]

I need to display this helper entity in 24 hour format (HH:MM)

It does not seem to be possible to do in gui.

Where does it need to be done and what is the correct syntax?

[tom_l]

It’s a global setting in your profile:

[viktorp75]

I feel bit stupid after I spent more than 2 hour looking for this solution, thank you!