@buka/class-transformer-extra/dist/esm/src/date/format-date.js

class-transformer-extra contains methods that's aren't included in the class-transform package.

import { Transform } from 'class-transformer';
import dayjs from 'dayjs';
export function FormatDate(template, options) {
    return Transform(function FormatDateTransform({ value }) {
        if (options?.optional && value === undefined)
            return undefined;
        return dayjs(value).format(template);
    }, options);
}