golang ambiguous year week number

today_isoweek.go

package main

import (
    "fmt"
    "time"
)

func main() {
    mysqlFmt := "2006-01-02 15:04:05"
    ambiguous, err := time.Parse(mysqlFmt, "2021-01-01 13:01:02")
    if err != nil {
        panic(err)
    }
    year, wk_num := ambiguous.ISOWeek()

    fmt.Printf("time: %s year: %d wk_num: %d\n", ambiguous, year, wk_num)
    // output:
    // time: 2021-01-01 13:01:02 +0000 UTC year: 2020 wk_num: 53
    // but mysql think it is 2021 week 1
}