What is the equivalent code in golang for the following shell command ?
date -u +%Y-%m-%dT%T%z
If you're looking for a simple, but not perfect solution consider using time.RFC3339 constant. But also know that there are differences between ISO8601 which are too complex for this answer.
See https://ijmacd.github.io/rfc3339-iso8601/ for differences and also has a handy test file generator to show differences. There is also a good discussion on SO here What's the difference between ISO 8601 and RFC 3339 Date Formats?
package main
import (
"time"
"fmt"
)
func main(){
fmt.Println(time.Now().Format(time.RFC3339))
}