include build time in binary

Makefile

@@ -5,7 +5,7 @@ VENDOR_DIR = vendor
 IMPORT_PATH = github.com/lbryio/reflector.go
 
 VERSION = $(shell git --git-dir=${DIR}/.git describe --dirty --always --long --abbrev=7)
-LDFLAGS = -ldflags "-X ${IMPORT_PATH}/meta.Version=${VERSION}"
+LDFLAGS = -ldflags "-X ${IMPORT_PATH}/meta.Version=${VERSION} -X ${IMPORT_PATH}/meta.Time=$(shell date +%s)"
 
 
 .PHONY: build dep clean test

cmd/version.go

@@ -1,10 +1,10 @@
 package cmd
 
 import (
-	"log"
+	"fmt"
+	"time"
 
 	"github.com/lbryio/reflector.go/meta"
-
 	"github.com/spf13/cobra"
 )
 
@@ -18,5 +18,5 @@ func init() {
 }
 
 func versionCmd(cmd *cobra.Command, args []string) {
-	log.Printf("version %s\n", meta.Version)
+	fmt.Printf("version %s (%s)\n", meta.Version, meta.BuildTime.Format(time.RFC3339))
 }

meta/meta.go

@@ -1,3 +1,20 @@
 package meta
 
+import (
+	"strconv"
+	"time"
+)
+
 var Version = ""
+var Time = ""
+var BuildTime time.Time
+
+func init() {
+	if Time != "" {
+		t, err := strconv.Atoi(Time)
+		if err != nil {
+			return
+		}
+		BuildTime = time.Unix(int64(t), 0).UTC()
+	}
+}