Can I use this for internationalization (i18n)?

Yes, it provides specific patterns for locale-aware formatting shortcuts (P, PP, PPP) that automatically adapt dates to the user's regional conventions.

How does this skill help reduce my application's bundle size?

The skill enforces modular function imports instead of entire library imports, allowing bundlers to tree-shake unused code and keep the footprint small.

Are the date operations provided by this skill immutable?

Absolutely. The skill prioritizes pure functions that return new Date objects rather than mutating existing ones, preventing common side-effect bugs.

Does this skill support the latest date-fns v4 features?

Yes, it includes comprehensive patterns for v4 timezone handling using @date-fns/tz and the TZDate class, alongside legacy v3 support.

Why use parseISO instead of the native Date constructor?

Native Date parsing is inconsistent across different browsers and locales; parseISO ensures reliable, standardized parsing of ISO 8601 strings in any environment.

date-fns Utility Patterns

Name: date-fns Utility Patterns
Author: agents-inc

byagents-inc

•

Herramientas para Desarrolladores

Implements modular, tree-shakeable date operations in TypeScript using date-fns best practices for formatting, parsing, and manipulation.

This skill provides Claude with specialized expertise in using the date-fns library to handle complex date and time operations within TypeScript projects. It enforces high-performance patterns such as tree-shaking, immutable date manipulation, and safe ISO parsing while providing standardized templates for internationalization and timezone management using both v3 and v4 (@date-fns/tz) conventions. By utilizing this skill, developers ensure their date logic is predictable, testable, and optimized for minimal bundle size.

Características Principales

01Locale-aware internationalization and regional formatting

02Tree-shakeable date formatting and parsing patterns

03Pure, immutable date arithmetic and manipulation functions

04Advanced timezone handling for date-fns v3 and v4 (@date-fns/tz)

051 GitHub stars

06Semantic date comparisons and interval validation

Casos de Uso

01Building complex calendar logic, date range filters, and duration calculations

02Implementing safe server-side date parsing and validation from ISO strings

03Developing localized date displays for global web applications

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add agents-inc/skills web-utilities-date-fns

For use in Claude.ai and ChatGPT

Características Principales

01Locale-aware internationalization and regional formatting

02Tree-shakeable date formatting and parsing patterns

03Pure, immutable date arithmetic and manipulation functions

04Advanced timezone handling for date-fns v3 and v4 (@date-fns/tz)

051 GitHub stars

06Semantic date comparisons and interval validation

Casos de Uso

01Building complex calendar logic, date range filters, and duration calculations

02Implementing safe server-side date parsing and validation from ISO strings

03Developing localized date displays for global web applications

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add agents-inc/skills web-utilities-date-fns

For use in Claude.ai and ChatGPT