Calculates the birth year and current age based on the age as of a date

Returns the generation of a person, given it's birth year

A TypeScript library to convert birth year to corresponding zodiac animal according to Vietnamese culture

This module will help to validate, get the birth year and check the gender using Sri Lankan NIC number

A Node.js and TypeScript package to validate Turkish citizens using first name, last name, birth year, and T.C. Kimlik Number via the official government API.

八宅 (Eight Mansions) feng shui engine: 命卦 from birth year + gender, 宅卦 from the sitting mountain, 大遊年 wandering-star charts over the eight directions.

JavaScript date/time utilities for Vega.

This repository contains the code for NHS.UK React components - a port of the [NHS.UK frontend components](https://github.com/nhsuk/nhsuk-frontend).

A library for obtaining browser versions with their maximum supported Baseline feature set and Widely Available status.

Calculates Easter for a given year

Chinese Calendar

Hypergrid plug-in to display headers for (nested) groups of columns.

Turn a wide range of freeform inputs describing someone's birth date into `YYYY-MM-DD` using locale to get proper day / month order.

This simple Node.js program allows you to input your birth year and get your Chinese zodiac sign.

A natural language date parser in Javascript

Determines current age based on a date of birth string YYYY-MM-DD using same weird logic we humans do.

Simple utility to get the current year with 2 or 4 digits.

Deterministic Zi Wei Dou Shu (紫微斗数) chart calculation MCP Server with True Solar Time, global IANA DST support, and explicit school/convention switches

Revised Bengali Calendar

Local birth time + place -> UT, correctly. IANA timezone resolution for caelus charts: DST, half-hour zones, ambiguous and nonexistent times.