isSameWeek(date: BikramSambat): boolean
Returns true if the provided Bikram Sambat date is in the same week as the current date.
const date1 = new BikramSambat('2078-05-15')
const date2 = new BikramSambat('2078-05-17')
const isSameWeek = date1.isSameWeek(date2) // true