Is it possible to hide the date in the datetime-input?
This is not currently possible with the datetime-input component. There is a Time UI Component on our Planned Roadmap where you can vote on the importance. 
In the meantime, there are a few options if it is critical to hide the date:
- Use the text-inputcomponent and write a custom validation function to check that the entry is in the expected time format.
- Use an object-tableto display and edit the time withedit-time.
              
              
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          Update: We have just released the new time-input component, allowing users to enter a time value only. Docs can be found here.