Function getBirthdayHD

getBirthdayHD(
hyear: number,
date: AnniversaryDate,
): SimpleHebrewDate | undefined
Same calculation as getBirthdayOrAnniversary, but returns the result as a SimpleHebrewDate ({yy, mm, dd}) rather than converting to a Gregorian Date. Useful when the caller needs the Hebrew date directly (e.g. for rendering with gematriya or further Hebrew-calendar arithmetic) and wants to avoid an extra R.D. → Gregorian round-trip.

See getBirthdayOrAnniversary for the full description of the algorithm and edge cases (Adar / Adar II, and the 30th of Marcheshvan, Kislev, or Adar I).
Parameters
- hyear: number
  Hebrew year in which to find the anniversary
- date: AnniversaryDate
  Gregorian or Hebrew date of the original event
Returns SimpleHebrewDate | undefined
anniversary occurring in hyear, or undefined when hyear precedes the original year
Example
```
import {getBirthdayHD} from '@hebcal/hdate';
const dt = new Date(2014, 2, 2); // 30 Adar I 5774
getBirthdayHD(5780, dt); // {yy: 5780, mm: 1, dd: 1} (1 Nisan)
```
- Defined in anniversary.ts:229