根据Go时间戳记的星期数

I am trying to get the week number based on the timestamp using GoLang.

ts is a int64 and converted

tm := time.UTUnix(ts, 0)
year := tm.Year()
week_nb := ???

for history ts has been generated using:

ts := time.Now().UTC().Unix()

I sent it to a gRPC based server and the server translate it to week number and year.

Any body knows who to convert a ts to a weeknumber ? time library already allow me to get the year but not the week

Thanks

Package time

import "time" 

func (Time) ISOWeek

func (t Time) ISOWeek() (year, week int)

ISOWeek returns the ISO 8601 year and week number in which t occurs. Week ranges from 1 to 53. Jan 01 to Jan 03 of year n might belong to week 52 or 53 of year n-1, and Dec 29 to Dec 31 might belong to week 1 of year n+1.

For example,

package main

import (
    "fmt"
    "time"
)

func main() {
    tn := time.Now().UTC()
    fmt.Println(tn)
    year, week := tn.ISOWeek()
    fmt.Println(year, week)

    ts := time.Now().UTC().Unix()
    tn = time.Unix(ts, 0)
    fmt.Println(tn)
    year, week = tn.ISOWeek()
    fmt.Println(year, week)
}

Playground: https://play.golang.org/p/CjfPscwYXf

Output:

2009-11-10 23:00:00 +0000 UTC
2009 46
2009-11-10 23:00:00 +0000 UTC
2009 46