reverse-date
About
This skill converts human-readable dates from various formats into standardized ISO format (YYYY-MM-DD). It handles flexible inputs like "21 Oct 2025", "October 21, 2025", and "21/10/2025" for consistent machine-readable output. Use it to normalize date formats for data processing or system integration.
Quick Install
Claude Code
Recommended/plugin add https://github.com/christopheryeo/claude-skillsgit clone https://github.com/christopheryeo/claude-skills.git ~/.claude/skills/reverse-dateCopy and paste this command in Claude Code to install this skill
Documentation
Date Converter
Overview
Convert dates from various human-readable formats into standardized ISO format (YYYY-MM-DD). This skill handles flexible date input parsing and provides consistent, machine-readable output.
Usage
Use the convert_date.py script to convert any date string to YYYY-MM-DD format:
python scripts/convert_date.py "21 Oct 2025"
# Output: 2025-10-21
Supported Input Formats
The script accepts a wide variety of date formats, including:
- Month-day-year: "21 Oct 2025", "October 21, 2025", "Oct 21, 2025"
- Slash-separated: "21/10/2025", "10/21/2025"
- Dash-separated: "21-10-2025", "2025-10-21"
- Other common formats: Most standard date representations
Examples
# Human-readable format
python scripts/convert_date.py "21 Oct 2025"
# → 2025-10-21
# Full month name
python scripts/convert_date.py "October 21, 2025"
# → 2025-10-21
# Slash format
python scripts/convert_date.py "21/10/2025"
# → 2025-10-21
# Already in ISO format
python scripts/convert_date.py "2025-10-21"
# → 2025-10-21
Error Handling
If the date string cannot be parsed, the script returns an error message:
python scripts/convert_date.py "invalid date"
# Error: Unable to parse date: 'invalid date'. Error: Unknown string format: invalid date
Implementation Details
The script uses Python's dateutil.parser library for flexible date parsing, which handles many common date formats automatically. The output is always in ISO 8601 format (YYYY-MM-DD).
GitHub Repository
Related Skills
content-collections
MetaThis skill provides a production-tested setup for Content Collections, a TypeScript-first tool that transforms Markdown/MDX files into type-safe data collections with Zod validation. Use it when building blogs, documentation sites, or content-heavy Vite + React applications to ensure type safety and automatic content validation. It covers everything from Vite plugin configuration and MDX compilation to deployment optimization and schema validation.
hybrid-cloud-networking
MetaThis skill configures secure hybrid cloud networking between on-premises infrastructure and cloud platforms like AWS, Azure, and GCP. Use it when connecting data centers to the cloud, building hybrid architectures, or implementing secure cross-premises connectivity. It supports key capabilities such as VPNs and dedicated connections like AWS Direct Connect for high-performance, reliable setups.
polymarket
MetaThis skill enables developers to build applications with the Polymarket prediction markets platform, including API integration for trading and market data. It also provides real-time data streaming via WebSocket to monitor live trades and market activity. Use it for implementing trading strategies or creating tools that process live market updates.
llamaindex
MetaLlamaIndex is a data framework for building RAG-powered LLM applications, specializing in document ingestion, indexing, and querying. It provides key features like vector indices, query engines, and agents, and supports over 300 data connectors. Use it for document Q&A, chatbots, and knowledge retrieval when building data-centric applications.
