fix: improve date in `version` command (#16365)

set date in go like a sane person

Makefile

@@ -23,9 +23,8 @@ else
 	VERSION := $(shell git describe --exact-match --tags 2>/dev/null)
 endif
 COMMIT := $(shell git rev-parse --short HEAD)
-DATE := $(shell date --utc +%FT%TZ)
 
-LDFLAGS := $(LDFLAGS) -X main.commit=$(COMMIT) -X main.date=$(DATE)
+LDFLAGS := $(LDFLAGS) -X main.commit=$(COMMIT)
 ifdef VERSION
 	LDFLAGS += -X main.version=$(VERSION)
 endif

cmd/influxd/main.go

@@ -5,6 +5,7 @@ import (
 	_ "net/http/pprof"
 	"os"
 	"strings"
+	"time"
 
 	"github.com/influxdata/influxdb"
 	"github.com/influxdata/influxdb/cmd/influxd/generate"
@@ -20,7 +21,7 @@ import (
 var (
 	version = "dev"
 	commit  = "none"
-	date    = "unknown"
+	date    = fmt.Sprint(time.Now().UTC().Format(time.RFC3339))
 )
 
 var rootCmd = &cobra.Command{