Function jday

jday(
    year: number | Date,
    mon?: number,
    day?: number,
    hr?: number,
    min?: number,
    sec?: number,
    msec?: number,
): number
Builds a julian date from the given parameters
Parameters
- year: number | Date
  year
- mon: number = 0
  month
- day: number = 0
  day
- hr: number = 0
  hour
- min: number = 0
  minute
- sec: number = 0
  seconds
- msec: number = 0
  milliseconds
Returns number
- Julian date