@burglekitt/gmt/dist/regex/date.js

Temporal-based date and time utilities with timezone support and polyfill integration

export const year = /^(?:\d{4}|[+-]\d{6})$/;
export const month = /^(0[1-9]|1[0-2])$/;
export const day = /^(0[1-9]|[12][0-9]|3[01])$/;
// ISO 8601 calendar date (extended): YYYY-MM-DD or ±YYYYYY-MM-DD
export const plainDate = /^(?:\d{4}|[+-]\d{6})-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])$/;