Input component with type="datetime-local" and step="1" behaves wrong

[whiteancient]

What is affected?

Component

Description

The hour-selector in an input with type="datetime-local" and step="1" does not allow to write a 2 digit number with the keyboard.

Reproduction

Here is a Gist that does not work.
https://lit.dev/playground/#gist=3eedd3e52aa191e027d059e26869ff5e

I does work for some users, but not all. I have customers complaining about the behavior.

Workaround

The workaround is to use the keyboard up/down to change the digit to its right value

Is this a regression?

No or unsure. This never worked, or I haven't tried before.

Affected versions

Current

Browser/OS/Node environment

Browser: Chrome and Edge
OS: Windows

[asyncLiz]

What timezone and locale are you in that is giving the unexpected behavior?

Entering in "October 10, 2025 @ 10:10:10am" works for me, but I'm in GMT-7 on en-US, so my inputs take a different format.

I don't see an am/pm section in your input, so I think it may be a different 24-hour locale that behaves differently.

[whiteancient]

I am in Sweden with sv-SE as my locale., Timezone right now is GMT+2 here.