set-variables-in-go-on-build.go

// go build -ldflags "-X main.BuildStamp=`date -u '+%Y-%m-%d_%I:%M:%S%p'` -X main.GitHash=`git rev-parse HEAD`" main.go 

package main

import (
        "fmt"
)

var (
        BuildStamp = ""
        GitHash = ""
)

func main() {
        // check variables
        fmt.Println("BuildStamp", BuildStamp)
        fmt.Println("GitHash", GitHash)
}