Move Complexity, Don't Hide It

Every system has irreducible complexity. The question is who handles it — the user or the system.

Incorrect (complexity pushed to user):

<input
  type="text"
  placeholder="Enter date as YYYY-MM-DDTHH:mm:ss.sssZ"
/>

Correct (system absorbs complexity):

<DatePicker
  onChange={(date) => setDate(date.toISOString())}
/>

Reference: Tesler's Law