Obtains an instance of {@code YearMonth} from a year and month.
@param year the year to represent, from MIN_YEAR to MAX_YEAR
@param month the month-of-year to represent, from 1 (January) to 12 (December)
@return the year-month, not null
@throws DateTimeException if either field value is invalid
Obtains an instance of {@code YearMonth} from a year and month.
@param year the year to represent, from MIN_YEAR to MAX_YEAR @param month the month-of-year to represent, from 1 (January) to 12 (December) @return the year-month, not null @throws DateTimeException if either field value is invalid