date-validation

Validate date references in planning and timeline documents.

Updated Nov 13, 2025

Search Tags:#timeline #calendar #ground-truth #countdown #date-validation #day-of-week

Ready to run

npx skills add https://github.com/JackReis/date-validation-skill --skill date-validation

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: date-validation
Source: https://github.com/JackReis/date-validation-skill/tree/main
Command: npx skills add https://github.com/JackReis/date-validation-skill --skill date-validation

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This skill prevents incorrect day‑of‑week labels, faulty relative‑date references, and miscalculated countdowns in planning hubs, timelines, and calendar files, eliminating downstream timeline errors.

Core Features & Use Cases

Two‑source ground truth: Verifies “today” using both <env> tags and the system date command.
Comprehensive scanning: Detects day‑name + date pairs, relative dates, and countdown phrases across the entire document.
Interactive correction: Presents each error with options, requires user confirmation, and re‑validates before allowing edits.
Auto‑trigger: Activates automatically on files matching Planning‑Hub, Timeline, Checklist, or calendar patterns.

Quick Start

Ask the date-validation skill to scan the current document for date errors and apply the suggested corrections.

Frequently Asked Questions about date-validation

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I validate dates and prevent day-of-week errors in planning documents?▼

Date validation in planning documents scans all date references against ground-truth sources to catch day-of-week and relative date errors. It cross-verifies system date and environment tags before applying any corrections.

Why do countdown calculations and relative dates break in my timeline files?▼

Countdown calculations and relative dates break when document references drift from the actual calendar. Comprehensive regex scanning detects these mismatches early, enforcing two-source truth verification before edits proceed.

Can I automatically check for date errors in checklist and calendar files?▼

Yes, automatic date error checking triggers on files matching Planning-Hub, Timeline, Checklist, and calendar patterns. It scans day-name pairs and countdown phrases, presenting errors for user-confirmed corrections.

What's the best way to ensure timeline accuracy before finalizing a planning hub?▼

The best way to ensure timeline accuracy is interactive correction with mandatory user confirmation. It re-validates all date references against two ground-truth sources before allowing any document edits.

Does date validation require system date access to verify relative dates?▼

Yes, verifying relative dates requires system date access alongside environment tags to establish two-source ground truth. This dual verification prevents single-point failures from corrupting your countdown data.

How do I fix incorrect calendar entries without overwriting valid dates?▼

Fixing incorrect calendar entries safely requires an interactive process that presents each detected error with options. The system mandates user confirmation and re-validation before applying any edits to valid dates.