Get the number of the week in Golang

NumberOfTheWeekInMonth.go

package main

import(
	"fmt"
	"time"
)

func NumberOfTheWeekInMonth(now time.Time) int {
	beginningOfTheMonth := time.Date(now.Year(), now.Month(), 1, 1, 1, 1, 1, time.UTC)
	_, thisWeek := now.ISOWeek()
	_, beginningWeek := beginningOfTheMonth.ISOWeek()
	return 1 + thisWeek - beginningWeek
}

func main(){
	fmt.Printf("This is %d, the %d week in the month", time.Now().Day(),NumberOfTheWeekInMonth(time.Now()))
}

for date 2020-03-31 the NumberOfTheWeekInMonth func is showing 6, i think 6th week is not possible of a month, what should be done in this case.

yes, it shows number of week from beginning of year in this month