const dateTimeOptions = { day: '2-digit', month: '2-digit', year: 'numeric', hour: '2-digit', minute: '2-digit', second: '2-digit', }; // todo for a more comprehensive list use of moment.tz from https://github.com/moment/moment-timezone const predefinedLocale = [ { locale: 'nb-NO', timezone: 'UTC', }, { locale: 'us-US', timezone: 'America/New_York', }, { locale: 'en-GB', timezone: 'Europe/London', }, ]; export const formatFullDateTimeWithLocale = (v, locale) => { let found = predefinedLocale.find(v => v.locale === locale); dateTimeOptions.timeZone = found ? found.timezone : 'UTC'; return new Date(v).toLocaleString(locale, dateTimeOptions); };