doneit-web/src/app/utils/date.ts

export class UDate {
  static GetDateWithTimeZone(Date: Date) {
    let date = Date;

    const tzOffset = -date.getTimezoneOffset(); // in minutes
    const diff = tzOffset >= 0 ? '+' : '-';
    const pad = (n: number) => (n < 10 ? '0' : '') + n;

    return date.getFullYear() +
        '-' + pad(date.getMonth() + 1) +
        '-' + pad(date.getDate()) +
        'T' + pad(date.getHours()) +
        ':' + pad(date.getMinutes()) +
        ':' + pad(date.getSeconds()) +
        diff + pad(Math.floor(Math.abs(tzOffset) / 60)) +
        ':' + pad(Math.abs(tzOffset) % 60);
  }
}