Date-fns Utility Patterns FAQs

Question 1

Can I use this for internationalized date formatting?

Accepted Answer

Absolutely. The skill provides specific patterns for locale-aware shortcuts (like P, PP, PPP) that automatically adapt date order and month names to user-specific regional conventions.

Question 2

Why are pure functions emphasized over date mutation?

Accepted Answer

Pure functions return new Date objects instead of modifying the input, which prevents side-effect bugs in shared references and makes your date logic significantly easier to test.

Question 3

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

Accepted Answer

Yes, it includes patterns for v4 timezone handling using the @date-fns/tz package and the new TZDate class for enhanced time zone management.

Question 4

Why should I use parseISO instead of the native Date constructor?

Accepted Answer

The native Date constructor parsing is inconsistent across different browsers and locales; parseISO ensures predictable and standardized results for ISO 8601 strings.

Question 5

How does this skill help with bundle size optimization?

Accepted Answer

It enforces modular imports of individual functions rather than the entire library, allowing modern bundlers to tree-shake unused code and keep your production builds small.

Date-fns Utility Patterns

Key Features

Use Cases

Date-fns Utility Patterns

Key Features

Use Cases