コンパイル日時をバイナリに埋める方法

build.sh

> go build -ldflags "-X main.Build=$(date +%Y-%m-%dT%H:%M:%S)" sample.go
> ./sample.go
2021-07-09T12:41:11

sample.go

package main

import "fmt"

var Build = "unknown"

func main() {
	fmt.Println(Build)
}