amiga-bootcamp/11_libraries/locale.md

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[← Home](../README.md) · [Libraries](README.md)
# locale.library — Internationalisation
## Overview
`locale.library` (OS 2.1+) provides language-aware string lookup, date/number formatting, and character classification for internationalised applications.
---
## Core Pattern
```c
struct Library *LocaleBase = OpenLibrary("locale.library", 38);
struct Catalog *cat = OpenCatalog(NULL, "myapp.catalog",
OC_BuiltInLanguage, "english",
TAG_DONE);
/* Get localised string: */
STRPTR str = GetCatalogStr(cat, MSG_HELLO, "Hello"); /* fallback */
CloseCatalog(cat);
CloseLibrary(LocaleBase);
```
---
## Locale-Aware Formatting
```c
struct Locale *loc = OpenLocale(NULL); /* user's default */
/* Format a date: */
FormatDate(loc, "%A %e %B %Y", &datestamp, &hook);
/* Format a number: */
/* Uses loc->loc_GroupSeparator, loc->loc_DecimalPoint */
CloseLocale(loc);
```
---
## References
- NDK39: `libraries/locale.h`