字符串到日期的转换（带+0530的IST）

I'm not able to convert the string "2017-12-07T20:01:33+0530" into a date format. I'm using RFC3339 and RFC3339Nano but still getting the following error:

0001-01-01 00:00:00 +0000 UTC parsing time "2016-01-17 20:04:05 +0530": hour out of range
IST to UTC: 0001-01-01 00:00:00 +0000 UTC

This is my code:

IST, err := time.LoadLocation("Asia/Kolkata")
if err != nil {
    fmt.Println(err)
    return
}

const longForm = "2006-01-02 15:04:05 +0530"
t, err := time.ParseInLocation(longForm, "2016-01-17 20:04:05 +0530", IST)
fmt.Println(t, err)
fmt.Printf("IST to UTC: %v

", t.UTC())

The format specifier for the timezone is wrong; you have:

const longForm = "2006-01-02 15:04:05 +0530"

But the timezone is defined as -0700, not +0530. So that should be:

const longForm = "2006-01-02 15:04:05 -0700"