@xfanta/mars-time/src/julian.ts

Mars time conversion library (MSD, MTC, Darian Calendar)

/**
 * Converts a UTC date to Julian Date.
 * @param date UTC date
 * @returns Julian Date
 */
export function utcToJulianDate(date: Date): number {
    return date.getTime() / 86400000 + 2440587.5;
  }
  
  /**
   * Converts a Julian Date to a UTC date.
   * @param jd Julian Date
   * @returns UTC Date
   */
  export function julianDateToUTC(jd: number): Date {
    const timestamp = (jd - 2440587.5) * 86400000;
    return new Date(timestamp);
  }