PromoClock: Timezone Tracker for Claude's 2x Off-Peak Hours Built with Claude 4.6
A developer has built PromoClock.co, a free timezone tracker specifically for Claude's 2x off-peak promo hours. The tool solves the daily annoyance of manually converting the published "5-11am PT / 12-6pm GMT" windows into local time.
How It Works
The website automatically detects a user's browser timezone and displays whether the 2x limits are currently active. It provides a countdown to the next status change.
Technical Build with Claude 4.6
The developer used Claude Opus 4.6 to build the entire project. Key implementation details from the source include:
- Timezone Logic: Claude wrote complex JavaScript using the
Intl.DateTimeFormatAPI to accurately convert PT/GMT hours to local browser time, correctly accounting for recent US Daylight Saving Time changes. - Next.js 15 & i18n: Claude architected the Next.js 15 App Router setup, including a lightweight Server Component-based i18n middleware to support 10 languages without bloating the client bundle.
- UI & Logo: Claude generated pure SVG code for the logo and styled the interface using Tailwind CSS based on a "minimalist/calm" design prompt.
- API & Tools: Claude helped create a
/api/statusJSON endpoint for terminal users and a dynamic.icscalendar generator to sync the 2x windows with personal calendars.
The tool is completely free with no advertisements.
📖 Read the full source: r/ClaudeAI
👀 See Also
Quell Proxy Fixes Claude Code Scroll-Jumping on Windows
Quell is a Rust proxy that sits between your terminal and Claude Code, stripping clear-screen sequences that cause scroll position resets during long responses. It also adds Shift+Enter for newlines, security filtering, and full Unicode support.
Peek Plugin for Claude Code: Automatic Steering Through Session Memory
Peek is a Claude Code plugin that automatically captures and injects user corrections and preferences to steer the AI assistant. It uses fusion search with embeddings, BM25, time decay, and metadata filters to provide relevant context without manual prompting.
Layerkit: AI Image Editor with Editable Layers Built with Claude Code
A developer built Layerkit, a browser-based AI image editor that generates scenes with editable layers to avoid constant re-prompting. The tool uses a multi-stage AI pipeline where one LLM plans composition, an image model generates the scene, and another LLM analyzes the actual image to place readable text.
Skillware adds synthetic data generator with entropy scoring for local model fine-tuning
Skillware has released a new synthetic data generator skill that uses zlib compression-ratio heuristics to score output diversity, helping prevent model collapse. The tool works out-of-the-box with Ollama, supports Gemini/Anthropic for high-reasoning batches, and outputs JSON batches for .jsonl fine-tuning pipelines.