import (
    "fmt"
    "time"
)

func main() {
    datetime := "20210401" //待转化为时间戳的字符串

    fmt.Println(GetWeek(datetime))

    //
    ////时间戳转化为日期
    //datetime = time.Unix(timestamp, 0).Format(timeLayout)
    //fmt.Println(datetime)

}

func GetWeek(datetime string) (y, w int) {
    timeLayout := "20060102"
    loc, _ := time.LoadLocation("Local")
    tmp, _ := time.ParseInLocation(timeLayout, datetime, loc)
    return tmp.ISOWeek()
}

import datetime
year, week, day = datetime.datetime.now().isocalendar()
print(week)

import time

time.strftime("%W")