# Syncro — Verify appointment date day-of-week before creating

**Rule:** Before creating any Syncro appointment, always verify that the computed date
actually falls on the intended day of the week.

**Why:** Day-of-week math is easy to get wrong. In the incident that prompted this rule
(2026-05-21, ticket #32312), "Saturday" was computed as May 24 — which is actually a Sunday.
The appointment landed on the wrong day and didn't appear where Winter expected it on the calendar.

**How to verify:**

Use Python or Bash to print the weekday before including it in the preview:

```bash
py -c "import datetime; d = datetime.date(2026, 5, 24); print(d.strftime('%A %Y-%m-%d'))"
# Output: Sunday 2026-05-24  ← would have caught the error
```

Or include the day name in the TICKET PREVIEW and require explicit user confirmation
that the day-of-week matches their intent.

**Catch:** Always show `Day YYYY-MM-DD` (e.g., "Saturday 2026-05-23") in the preview —
never just the numeric date — so the user can verify at a glance.

Reported by Winter, 2026-05-21.
