Setting Checklist Item Time via API Not Working

🔧 Bugs & Issues
1

Apologies for submitting it this way, but I had Claude write me a summary of what I believe to be a bug. Please see details below.

Summary

When updating a checklist item’s due_at field via the Record Update API (PUT /v1/record/{id}), the time component is silently stripped. Only the date is preserved. Times set via the Tape UI work correctly and are returned in API responses, but cannot be set or modified through the API.

Steps to Reproduce

  1. Create a checklist item with a due date+time via the Tape UI (e.g., March 29 at 7:00 PM)
  2. Confirm the API returns the time correctly:
    {
    “due_at”: “2026-03-29 19:00:00”,
    “due_at_time”: “19:00:00”,
    “due_at_utc”: “2026-03-29 22:00:00”,
    “due_at_time_utc”: “22:00:00”
    }
  3. Update the checklist item via API with a datetime value:
    PUT /v1/record/170502847
    {
    “fields”: {
    “725247”: [{
    “id”: 412561,
    “title”: “Test Task”,
    “due_at”: “2026-03-29 19:00:00”
    }]
    }
    }
  4. Observe the time is stripped:
    {
    “due_at”: “2026-03-29 00:00:00”,
    “due_at_time”: null,
    “due_at_utc”: “2026-03-29 00:00:00”,
    “due_at_time_utc”: null
    }

Formats Tested (all strip the time)

┌────────────────────────────────────────────────────────────────┬────────────────┐
│ Input │ Result │
├────────────────────────────────────────────────────────────────┼────────────────┤
│ “due_at”: “2026-03-29 19:00:00” │ date only │
├────────────────────────────────────────────────────────────────┼────────────────┤
│ “due_at”: “2026-03-29 19:00” │ date only │
├────────────────────────────────────────────────────────────────┼────────────────┤
│ “due_at”: “2026-03-29”, “due_at_time”: “19:00:00” │ date only │
├────────────────────────────────────────────────────────────────┼────────────────┤
│ “due_at_utc”: “2026-03-29 23:00:00” │ date only │
├────────────────────────────────────────────────────────────────┼────────────────┤
│ “due_at_date_utc”: “2026-03-29”, “due_at_time_utc”: “23:00:00” │ wiped entirely │
├────────────────────────────────────────────────────────────────┼────────────────┤
│ “due_at_date”: “2026-03-29”, “due_at_time”: “19:00:00” │ wiped entirely │
└────────────────────────────────────────────────────────────────┴────────────────┘

Expected Behaviour

The API should accept a time component on due_at (or via due_at_time / due_at_time_utc) and persist it, matching the behaviour available in the UI.

Impact

API integrations cannot programmatically set or modify due times on checklist items — only dates. This limits automation workflows that need to schedule checklist items at specific times.