copy

fun copy(year: Int = this.year, month: Month = this.month): YearMonth
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Returns a copy of this year-month with the values of any individual components replaced by the new values specified.

Throws

if the year is invalid

fun copy(year: Int = this.year, monthNumber: Int): YearMonth
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Returns a copy of this year-month with the values of any individual components replaced by the new values specified.

Throws

if the year or month is invalid