isAdDateConvertible

fun isAdDateConvertible(year: Int, month: Int, dayOfMonth: Int): Boolean(source)

Whether a Gregorian date has a Bikram Sambat equivalent.

getAdYearRange alone is not a sufficient check: the calendars start mid-year relative to each other, so 1913-01-01 through 1913-04-12 sit inside the year range yet cannot be converted.