reverse-month
Convert dates from various formats to "reverse month" format (YYYY-MM), which is the ISO date format containing only the year and month components. Use when users need to extract year-month from dates, standardize month formats, or prepare dates for monthly aggregations and reporting.
Best use case
reverse-month is best used when you need a repeatable AI agent workflow instead of a one-off prompt.
Convert dates from various formats to "reverse month" format (YYYY-MM), which is the ISO date format containing only the year and month components. Use when users need to extract year-month from dates, standardize month formats, or prepare dates for monthly aggregations and reporting.
Teams using reverse-month should expect a more consistent output, faster repeated execution, less prompt rewriting.
When to use this skill
- You want a reusable workflow that can be run more than once with consistent structure.
When not to use this skill
- You only need a quick one-off answer and do not need a reusable workflow.
- You cannot install or maintain the underlying files, dependencies, or repository context.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/reverse-month/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How reverse-month Compares
| Feature / Agent | reverse-month | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
Convert dates from various formats to "reverse month" format (YYYY-MM), which is the ISO date format containing only the year and month components. Use when users need to extract year-month from dates, standardize month formats, or prepare dates for monthly aggregations and reporting.
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
SKILL.md Source
# Reverse Month Converter ## Overview Convert dates from various human-readable formats into standardized "reverse month" format (YYYY-MM). This skill handles flexible date input parsing and provides consistent, machine-readable month output by extracting only the year and month components from a full date. The reverse month format is the year and month portion of an ISO date (YYYY-MM), making it ideal for monthly reporting, time-series aggregations, and calendar operations. ## Usage Use the `convert_month.py` script to convert any date string to YYYY-MM format: ```bash python scripts/convert_month.py "21 Oct 2025" # Output: 2025-10 ``` ### 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" - **ISO format**: "2025-10-21" - **Other common formats**: Most standard date representations ### Examples ```bash # Human-readable format python scripts/convert_month.py "21 Oct 2025" # → 2025-10 # Full month name python scripts/convert_month.py "October 21, 2025" # → 2025-10 # Slash format python scripts/convert_month.py "21/10/2025" # → 2025-10 # Already in ISO format python scripts/convert_month.py "2025-10-21" # → 2025-10 # Short format python scripts/convert_month.py "Oct 2025" # → 2025-10 ``` ### Error Handling If the date string cannot be parsed, the script returns an error message: ```bash python scripts/convert_month.py "invalid date" # Error: Unable to parse date: 'invalid date'. Error: Unknown string format: invalid date ``` ## Common Use Cases - Monthly reporting and aggregations - Calendar month filtering - Time-series data grouping by month - Standardizing month identifiers across different date formats - Extracting billing or subscription periods ## Relationship to reverse-date Skill This skill builds upon the reverse-date skill concept. While reverse-date converts dates to full ISO format (YYYY-MM-DD), reverse-month extracts only the year-month portion (YYYY-MM), providing a coarser granularity suitable for monthly operations. ## 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 year-month format (YYYY-MM). ```
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