Chronera.

import { parseLocalDate, formatWithPattern } from '@intech-software/chronera';

const date = parseLocalDate("2026-10-19");
console.log(formatWithPattern(date, 'd MMMM yyyy', {
  locale: 'th-TH', calendar: 'buddhist', numberingSystem: 'latn',
}));
console.log(formatWithPattern(date, 'd MMMM yyyy', {
  locale: 'en-GB', calendar: 'gregory', numberingSystem: 'latn',
}));

import { parseInstant, formatWithPattern } from '@intech-software/chronera';

const instant = parseInstant("2026-10-18T17:30:00Z");
console.log(formatWithPattern(instant, 'dd/MM/yyyy HH:mm', {
  locale: 'th-TH', calendar: 'buddhist', numberingSystem: 'latn',
  timeZone: "Asia/Bangkok",
}));
console.log(formatWithPattern(instant, 'dd/MM/yyyy HH:mm', {
  locale: 'en-GB', calendar: 'gregory', numberingSystem: 'latn',
  timeZone: 'UTC',
}));

import { parseLocalDate, addDays, formatWithPattern } from '@intech-software/chronera';

const date = parseLocalDate("2026-12-31");
const result = addDays(date, 1);
console.log(formatWithPattern(result, 'dd/MM/yyyy', {
  locale: 'th-TH', calendar: 'buddhist', numberingSystem: 'latn',
}));
console.log(formatWithPattern(result, 'yyyy-MM-dd', {
  locale: 'en-GB', calendar: 'gregory', numberingSystem: 'latn',
}));