---
name: tbt-ai-time-zone-planner
description: "Require date-aware time-zone handling rather than fixed offsets for Ask AI to build a small time-zone planning tool. Use permitted source material; this kit does not authorise external actions."
---

# Ask AI to build a small time-zone planning tool

Require date-aware time-zone handling rather than fixed offsets.

Use the supplied source as authority. Check the account supports the actual file or image operation before attempting it.

## Task instruction

Build a small offline time-zone planner in HTML, CSS and JavaScript.
Take an ISO timestamp with Z or an explicit offset as the source instant.
Show the full date, weekday and time in Europe/London, America/New_York
and Asia/Kolkata using date-aware Intl.DateTimeFormat handling.
Reject invalid or zone-free timestamps with an explanation.
Label the source instant and each named zone. Do not use fixed offsets.
Keep it local, with no calendar connection, tracking or invitation sending.
Return the actual downloadable files and instructions for opening them.

## Source boundaries

- 20 Oct: London 14, New York 09
- 26 Oct: London 14, New York 10
- Kolkata also follows the exact instant

## Review and correction

Use named zones and an unambiguous instant. A permanent five-hour subtraction fails across these dates.

The source local time can refer to more than one instant. Do not choose
one silently. Ask for the intended offset or an unambiguous timestamp,
then show that source instant beside the zone conversions.
Repair the input validation while preserving the working date-aware display.

Use references/practice-source.json for the labelled example. The practice HTML is a local teaching tool; it does not call an AI service. Apply this method to the user's supplied facts rather than copying fictional example values. Do not infer approval or permission to publish.