获取月末和月末的最简单方法是什么？

import datetime

today = datetime.date.today()
end_of_month = datetime.date(today.year, today.month, 1) + datetime.timedelta(days=32)
end_of_month = end_of_month.replace(day=1) - datetime.timedelta(days=1)

print(end_of_month)

import java.time.LocalDate;
import java.time.temporal.TemporalAdjusters;

LocalDate today = LocalDate.now();
LocalDate endOfMonth = today.with(TemporalAdjusters.lastDayOfMonth());

System.out.println(endOfMonth);

var today = new Date();
var endOfMonth = new Date(today.getFullYear(), today.getMonth() + 1, 0);

console.log(endOfMonth);